A masterless grid photovoltaic module
By using pre-fixed adhesive dots and a coating design in gridless photovoltaic modules, the problem of solder ribbons detaching from the electrodes during handling and transfer is solved, achieving a stable connection between the solder ribbons and the cells and preventing poor soldering and grid detachment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEFEI GCL SYST INTEGRATION NEW ENERGY TECH CO LTD
- Filing Date
- 2025-04-29
- Publication Date
- 2026-06-23
AI Technical Summary
In the production of gridless photovoltaic modules, the reliable connection between the solder ribbon and the solar cells is a problem, especially the situation where the solder ribbon is prone to detaching from the electrode during handling and transfer, leading to poor soldering and grid detachment.
The solder ribbon is pre-fixed to the solar cell using pre-fixed adhesive dots, and then bonded to the solar cell with a film to prevent the solder ribbon from falling off during handling and transfer.
It effectively prevents the solder ribbon from falling off during module handling and transfer, avoids incomplete soldering and grid detachment, and ensures a stable connection between the solder ribbon and the solar cell.
Smart Images
Figure CN224401998U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic module manufacturing equipment technology, specifically to a gridless photovoltaic module. Background Technology
[0002] In the production of OBB (Out-of-Block) solar modules, reliable connection between the solder ribbon and the solar cell is a critical process. The existing method for welding the solder ribbon to OBB cells is a coating method, which uses a coating to adhere the solder ribbon to the surface of the solar cell. However, during cell string transfer and coating processes, relative displacement occurs between the solder ribbon and the solar cell, causing the solder ribbon to detach from the solar cell electrodes. Utility Model Content
[0003] The purpose of this utility model is to provide a gridless photovoltaic module that, through the design of pre-fixed adhesive dots, prevents the solder strips at both ends of the cells from falling off during the handling and transfer of the module, which could lead to incomplete soldering or grid detachment.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A gridless photovoltaic module includes a cell string, the cell string comprising:
[0006] Multiple solar cells are arranged along a first direction, and the surface of the solar cells has an electrode pattern.
[0007] The solder ribbon connects the solar cells in the battery string in series. The solder ribbon extends along a first direction on the surface of the solar cell and forms a welded structure with the electrode pattern.
[0008] Pre-fixing adhesive dots are used to pre-fix the solder ribbon onto the solar cell; and
[0009] The coating is applied to the solder ribbon and pre-fixed adhesive dots and then bonded to the solar cell.
[0010] In some embodiments, the surface of the solar cell is provided with multiple solder strips spaced apart in a second direction, and the first direction and the second direction intersect.
[0011] The coating extends across all the solder strips on the surface of the solar cell in the second direction.
[0012] In some embodiments, the surface of the solar cell is provided with multiple solder strips spaced apart in a second direction, and the first direction and the second direction intersect.
[0013] The coating has multiple strips extending in a first direction and spaced apart in a second direction, with each strip covering at least one welding strip.
[0014] In some embodiments, the solder strip includes a first segment whose orthographic projection on the solar cell is located inside the solar cell, and pre-fixed adhesive dots are disposed at both ends of the first segment.
[0015] In some embodiments, the solar cell includes a first side and a second side opposite to the first side. The first side has a positive electrode pattern, and the second side has a negative electrode pattern. Each solder strip includes two first segments. The orthogonal projection of one of the first segments in the thickness direction of the solar cell is located on the first side of one of the solar cells and forms a weld structure with the positive electrode pattern on the first side. The orthogonal projection of the other first segment in the thickness direction of the solar cell is located on the second side of an adjacent solar cell and forms a weld structure with the negative electrode pattern on the second side.
[0016] In some embodiments, the solar cell includes a first side and a second side, the second side having both a positive electrode pattern and a negative electrode pattern, the first side having no electrode pattern, and each solder strip including two first segments, one of which has its orthographic projection in the thickness direction of the solar cell located on the second side of one of the solar cells and forming a welded structure with the positive electrode pattern on the second side, and the other of which has its orthographic projection in the thickness direction of the solar cell located on the second side of an adjacent solar cell and forming a welded structure with the negative electrode pattern on the second side.
[0017] In some implementations, the film does not cover the pre-fixed adhesive dots.
[0018] Due to the application of the above technical solution, the beneficial effects of this application compared with the prior art are as follows: the pre-fixed adhesive dots prevent the solder ribbons at both ends of the battery from falling off during the handling and transfer of the module, which may cause poor soldering or grid detachment; after the pre-fixed adhesive dots are applied, the solder ribbons adhere to the battery cells, preventing the solder ribbons from shifting and causing poor soldering. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 A front view of a cell string of a gridless photovoltaic module is shown in some examples of this disclosure;
[0021] Among them, 1. Battery string; 2. Solar cell; 3. Solder strip; 4. Pre-fixed adhesive dots; 5. Coating; 6. First section; 7. Electrode pattern. Detailed Implementation
[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.
[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0024] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0025] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.
[0026] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.
[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.
[0028] According to some examples of this disclosure, a gridless photovoltaic module includes a cell string 1. Please refer to... Figure 1 The battery string 1 includes multiple solar cells 2, solder ribbons 3, pre-fixed adhesive dots 4, and a coating 5.
[0029] In the battery string 1, solar cells 2 are arranged along a first direction D1. The surface of the solar cell 2 has an electrode pattern 7. For example, the solar cell 2 includes a first side and a second side opposite to the first side. The first side can be the side facing solar radiation during the operation of the photovoltaic module, and can also be called the light-receiving side or front side. The second side can be the side facing away from solar radiation during the operation of the photovoltaic module, and can be called the back side or back side.
[0030] The electrode pattern 7 of the solar cell 2 includes a positive electrode pattern and a negative electrode pattern. The positive electrode pattern and the negative electrode pattern can be located on two separate sides of the solar cell 2, or they can be disposed together on the back side of the solar cell 2. For example, a solar cell 2 may have a positive electrode pattern on its first side and a negative electrode pattern on its second side. Alternatively, a solar cell 2 may have both a positive electrode pattern and a negative electrode pattern on its second side, while the first side may not have an electrode pattern 7.
[0031] In related technologies, solar cells include a main grid and fine grids, which intersect perpendicularly. The current collected by the fine grids is fed onto the main grid and then transmitted to an external circuit via solder strips connected to the main grid.
[0032] In this disclosure, the solar cell 2 is a gridless cell. That is, the electrode pattern 7 of this disclosure has fine grids, but no main grids. Exemplarily, the electrode pattern 7 of the solar cell 2 includes fine grids extending along a second direction D2, with the fine grids spaced apart along a first direction D1. The first direction D1 intersects the second direction D2.
[0033] Multiple solder strips 3 are spaced apart along the second direction D2 on the surface of the solar cell 2. The solder strips 3 connect the solar cells 2 in the cell string 1 in series, and the solder strips 3 extend along the first direction D1 on the surface of the solar cell 2, forming a welded structure with the electrode pattern 7.
[0034] The solder ribbon 3 can extend from the surface of one solar cell 2 along a first direction D1 to the surface of an adjacent solar cell 2. Specifically, the solder ribbon 3 includes two first segments 6, one of which, in its orthographic projection along the thickness direction of the solar cell 2, lies within one solar cell 2, and the other of which, in its orthographic projection along the thickness direction of the solar cell 2, lies within an adjacent solar cell 2.
[0035] Furthermore, in an embodiment where the positive electrode pattern and the negative electrode pattern are located on the first surface and the second surface, respectively, one of the first segments 6 of the solder strip forms a welding structure with the positive electrode pattern on the first surface of a solar cell 2, and the other first segment 6 forms a welding structure with the negative electrode pattern on the second surface of an adjacent solar cell 2.
[0036] In an embodiment where both the positive electrode pattern and the negative electrode pattern are located on the second surface, one of the first segments 6 of the solder strip 3 forms a welding structure with the positive electrode pattern on the second surface of a solar cell 2, and the other first segment 6 forms a welding structure with the negative electrode pattern on the second surface of an adjacent solar cell 2.
[0037] For example, in order to firmly form a good conductive structure between the electrode pattern 7 and the solder strip 3, the electrode pattern 7 also has a pad (not shown in the figure), which has a larger width relative to the fine gate, and allows the solder strip and the electrode pattern 7 to have sufficient welding area.
[0038] For example, the surface of the solder ribbon 3 has a metal coating. Heat input to the solder ribbon 3 can melt the metal coating on the surface of the solder ribbon 3, thereby forming a conductive weld structure between the solder ribbon 3 and the electrode pattern 7. Furthermore, the weld structure between the solder ribbon 3 and the electrode pattern 7 can also be formed by utilizing the heating process in the photovoltaic module lamination process.
[0039] The coating 5 covers the solder ribbon 3 and the pre-fixed adhesive dots 3 and is bonded to the solar cell 2. The coating 5 can be an adhesive film that becomes sticky when heated to a certain temperature. The coating 5 covers the solder ribbon 3 and is connected to the solar cell 2, which can fix the solder ribbon 3 to the surface of the solar cell 2.
[0040] In some examples, the surface of the solar cell 2 has multiple solder strips 3 spaced apart in the second direction D2, and the coating 5 crosses all the solder strips 3 on the surface of the solar cell 2 in the second direction D2. The coating 5 can be a complete film with an area not exceeding that of the solar cell 2.
[0041] In some examples, the surface of the solar cell 2 has multiple solder strips 3 spaced apart in a second direction D2, and the coating 5 has multiple strips extending in a first direction D1 and spaced apart in a second direction D2, with each coating 5 covering at least one solder strip 3. The coating 5 can be a strip.
[0042] Pre-fixing adhesive dots 4 pre-fix the solder ribbon 3 to the solar cell 2. Pre-fixing adhesive dots 4 are applied before covering with the coating 5. Using pre-fixing adhesive dots 4 to pre-fix the solder ribbon 3 to the surface of the solar cell 2 prevents the solder ribbon 3 from shifting during handling, transfer, and covering with the coating 5. Pre-fixing adhesive dots 4 can reduce the occurrence of solder joint defects and grid detachment caused by the solder ribbon falling off at both ends of the cell during module handling and transfer. After applying pre-fixing adhesive dots 4, the solder ribbon adheres to the cell, preventing displacement of the solder ribbon and thus preventing solder joint defects.
[0043] The material for the pre-fixed adhesive point 4 can be hot melt adhesive or UV-curable adhesive, etc.
[0044] In some examples, the film 5 does not cover the pre-fixed adhesive dots 4. This prevents the pre-fixed adhesive dots 4 from puncturing the film 5.
[0045] In some examples, pre-fixed adhesive dots 4 are placed at both ends of the first segment 6. Placing the pre-fixed adhesive dots 4 at both ends of the first segment 6 makes it easier for the lamination 5 to avoid the pre-fixed adhesive dots 4, preventing the pre-fixed adhesive dots 4 from puncturing the middle of the lamination 5 and reducing the risk of damage to the lamination 5.
[0046] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A gridless photovoltaic module, comprising a battery string, characterized in that, The battery string includes: Multiple solar cells are arranged along a first direction, and the surface of the solar cells has an electrode pattern. A solder ribbon connects solar cells in the battery string in series. The solder ribbon extends along the first direction on the surface of the solar cell and forms a welding structure with the electrode pattern. The solder ribbon includes a first segment, the orthogonal projection of which is located inside the solar cell. Pre-fixing adhesive dots are used to pre-fix the solder ribbon onto the solar cell; the pre-fixing adhesive dots are located at both ends of the first segment; and A coating is applied to the solder strip and bonded to the solar cell; the coating does not cover the pre-fixed adhesive dots.
2. The gridless photovoltaic module according to claim 1, characterized in that, The surface of the solar cell is provided with multiple solder strips spaced apart in a second direction, and the first direction intersects the second direction; the coating crosses all the solder strips on the surface of the solar cell in the second direction.
3. The gridless photovoltaic module according to claim 1, characterized in that, The surface of the solar cell is provided with multiple solder strips spaced apart in a second direction, the first direction intersecting the second direction; the coating has multiple strips extending in the first direction and spaced apart in the second direction, each strip of the coating crossing at least one solder strip in the second direction.
4. The gridless photovoltaic module according to claim 1, characterized in that, The solar cell includes a first surface and a second surface opposite to the first surface. The first surface has a positive electrode pattern, and the second surface has a negative electrode pattern. Each of the solder strips includes two first segments. One of the first segments, when projected onto the first surface of one of the solar cells in the thickness direction, forms a weld structure with the positive electrode pattern on the first surface. The other first segment, when projected onto the second surface of an adjacent solar cell in the thickness direction, forms a weld structure with the negative electrode pattern on the second surface.
5. The gridless photovoltaic module according to claim 1, characterized in that, The solar cell includes a first surface and a second surface. The second surface is provided with both a positive electrode pattern and a negative electrode pattern. The first surface is not provided with an electrode pattern. Each of the welding strips includes two first segments. One of the first segments is projected onto the second surface of one of the solar cells in the thickness direction and forms a welding structure with the positive electrode pattern on the second surface. The other first segment is projected onto the second surface of an adjacent solar cell in the thickness direction and forms a welding structure with the negative electrode pattern on the second surface.