Insulating reflective strip and photovoltaic module
By setting insulated reflective strips and embossed reflective structures in the photovoltaic module, the problem of low optical resource utilization caused by excessive cell string spacing in the photovoltaic module is solved, higher light utilization and module efficiency are achieved, and production is reduced cost.
Patent Information
- Application Number
- CN202420608777.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-27
AI Technical Summary
The large spacing between adjacent cells in conventional photovoltaic modules leads to low optical resource utilization, affecting the module power and conversion efficiency, and increasing material costs.
Insulated reflective strips are arranged between adjacent cell strings, and their embossed reflective structure and height are higher than the cell design, controlling the spacing of the cell strings, increasing the effective light area, and increasing the light utilization rate through reflection.
Effectively avoid short circuit of battery strings, reduce battery string spacing, improve light utilization and component power, reduce production costs, and prevent slippage between the insulating reflective strips and the battery cells.
Smart Images
Figure CN222168410U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaics, in particular to an insulating reflective strip and a photovoltaic assembly. Background Art
[0002] With the continuous updating and iteration of photovoltaic technology and the rising efficiency of photovoltaic modules, the development of the photovoltaic industry in China has become more mature, and "cost reduction and efficiency improvement" has become the main theme of the industry's development. Photovoltaic modules with higher efficiency, higher power, higher single-watt power generation and lower cost are the pursuit of the current market and the technical direction of photovoltaic companies. Because the spacing between adjacent battery strings is too small, it may cause contact short circuits between battery strings, which will affect the normal operation of photovoltaic modules, so adjacent battery strings are usually set with a larger spacing. In conventional photovoltaic modules, the spacing between battery strings is relatively large, and there is room for improvement in the utilization of light resources. In addition, when the overall area of the module is determined, the area of the non-photoactive dead zone is relatively large, which not only fails to maximize the utilization of light resources, but also reduces the power and conversion efficiency of the module, and greatly increases the material cost. Therefore, how to improve the utilization rate of light is a technical problem that technicians in this field currently need to solve. Utility Model Content
[0003] In view of this, the purpose of the utility model is to provide an insulating reflective strip and a photovoltaic module, which are used to solve the problem of low light utilization rate in conventional photovoltaic modules.
[0004] In order to solve the above technical problems, the utility model provides an insulating reflective strip for spacing adjacent battery cells in the arrangement direction of adjacent battery strings; the insulating reflective strip has an embossed reflective structure on the side close to the battery cell; the height of the insulating reflective strip is higher than the height of the battery cell.
[0005] Optionally, there are at least two insulating reflective strips; the insulating reflective strips are arranged at intervals along the extension direction of the battery string.
[0006] Optionally, the insulating reflective strip is an integrated structure made of a uniform material.
[0007] Optionally, the insulating reflective strip is a transparent thermoplastic polyester film.
[0008] Optionally, the height of the insulating reflective strip is 180 μm-250 μm, including the values at both ends.
[0009] Optionally, the insulating reflective strip is close to the adjacent battery slices, so that the spacing between adjacent battery strings is equal to the width of the insulating reflective strip.
[0010] Optionally, the width of the insulating reflective strip is 200 μm-500 μm, including the values at both ends.
[0011] In order to solve the above technical problems, the utility model also provides a photovoltaic module, comprising: a back plate, a back adhesive film, a battery string layer, a front adhesive film and a front plate arranged in sequence along the thickness direction;
[0012] The battery string layer includes at least two battery strings; and the insulating reflective strips described in any one of the above items are arranged between adjacent battery strings.
[0013] Optionally, one end of the insulating reflective strip is fixedly connected to the back plate; the other end of the insulating reflective strip passes through the hole on the back adhesive film.
[0014] Optionally, hot melt adhesive is coated on the surface of the back panel at positions corresponding to the insulating reflective strips.
[0015] The beneficial effects of the utility model are as follows: insulating reflective strips are arranged between adjacent battery strings to separate the battery strings to avoid short circuits between adjacent battery strings. The battery string spacing can be controlled by controlling the width of the insulating reflective strips, which can greatly reduce the battery string spacing, increase the effective light area, thereby improving the light utilization rate, and further improving the module power and module conversion efficiency, and can also reduce production costs; at the same time, the two sides of the insulating reflective strips close to the battery cells are designed as wavy embossed reflective structures, and the height of the insulating reflective strips is higher than the height of the battery cells. When sunlight is not vertically incident on the surface of the battery cell, part of the sunlight can be reflected by the insulating reflective strips, and the embossed reflective structure can reflect the reflected part of the sunlight to the battery cell on the same side, and by increasing the reflection of light, more light is reflected to the battery cell, thereby improving the light utilization rate, and further improving the module power and module conversion efficiency. In addition, the two sides of the insulating reflective strips close to the battery cell are designed as wavy embossed reflective structures, which can also prevent the isolated battery cell and the insulating reflective strip from slipping. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0017] Figure 1 A schematic diagram of the local arrangement of an insulating reflective strip between battery strings provided in an embodiment of the utility model;
[0018] Figure 2 An enlarged cross-sectional view of an insulating reflective strip provided in an embodiment of the utility model;
[0019] Figure 3 A schematic diagram of the structure of a photovoltaic module provided by an embodiment of the utility model;
[0020] Figure 4 A schematic diagram of the arrangement of an insulating reflective strip in a photovoltaic module provided by an embodiment of the utility model;
[0021] Figure 5 A schematic diagram of the structure of a back adhesive film provided by an embodiment of the utility model;
[0022] Figure 6 A photovoltaic module preparation flow chart provided for an embodiment of the utility model.
[0023] The following are the descriptions of the reference numerals:
[0024] 1-battery cell; 2-insulating reflective strip; 21-embossed reflective structure; 3-welding strip; 4-silver paste dots; 51-back plate; 52-back adhesive film; 521-holes; 53-battery string layer; 54-front adhesive film; 55-front plate. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic diagram of the local arrangement of an insulating reflective strip between battery strings provided by an embodiment of the utility model; Figure 2 This is an enlarged cross-sectional view of an insulating reflective strip provided in an embodiment of the utility model. Figure 1 Each cell string shown is formed by connecting the conductive contacts (such as silver paste dots 4) on adjacent cells 1 through the solder strips 3. The insulating reflective strip provided in this embodiment can be used to separate adjacent cells 1 in the arrangement direction of adjacent cell strings; the side of the insulating reflective strip 2 close to the cell 1 has an embossed reflective structure 21; the height of the insulating reflective strip 2 is higher than the height of the cell 1.
[0027] It should be noted that the entire side of the insulating reflective strip 2 close to the adjacent battery cell 1 is an embossed reflective structure 21, which is an uneven wavy structure that can increase the reflective performance of the insulating reflective strip 2. Among them, the embossed reflective structure 21 of the insulating reflective strip 2 that is higher than the battery cell 1 can re-reflect part of the sunlight that is not vertically incident on the surface of the battery cell 1 to the battery cell 1 on the same side, thereby improving the light utilization rate; the embossed reflective structure 21 of the insulating reflective strip 2 corresponding to the battery cell 1 can increase the friction between the insulating reflective strip 2 and the battery cell 1, and prevent the battery cell 1 and the insulating reflective strip 2 from slipping.
[0028] The present embodiment does not limit the specific number and arrangement of the insulating reflective strips 2 between each group of adjacent battery cells 1. In order to enhance the isolation effect of the insulating reflective strips 2 on the battery string, the present embodiment may include at least two insulating reflective strips 2; the insulating reflective strips 2 are arranged at intervals along the extension direction of the battery string.
[0029] The present embodiment does not limit the specific structure of the insulating reflective strip 2, as long as the insulating reflective strip 2 has insulating properties and a high reflectivity on the surface. For example, the insulating reflective strip 2 can be an integrated structure with a uniform material, that is, the insulating reflective strip 2 is a whole composed of a material that has both insulating properties and high reflectivity. The present embodiment does not limit the specific type of the insulating reflective strip 2 with an integrated structure, as long as the insulating reflective strip 2 has both insulating properties and high reflectivity. For example, the insulating reflective strip 2 can be a transparent thermoplastic polyester film. It should be noted that the thermoplastic polyester film is a transparent material. Using the thermoplastic polyester film as the insulating reflective strip 2 can ensure that the appearance of the photovoltaic module is more beautiful.
[0030] This embodiment does not limit the specific height of the insulating reflective strip 2 , and the specific height of the insulating reflective strip 2 can be determined according to the actual height of the battery cell 1 . For example, the height of the insulating reflective strip 2 can be 180 μm-250 μm, including both ends.
[0031] Furthermore, in this embodiment, the insulating reflective strip 2 can be close to the adjacent battery cells 1, so that the spacing between adjacent battery strings is equal to the width of the insulating reflective strip 2. In this embodiment, by placing the battery cells 1 close to the insulating reflective strip 2, the spacing between battery strings can be reduced to the thickness of the insulating reflective strip 2. This embodiment does not limit the specific width of the insulating reflective strip 2, and the specific width of the insulating reflective strip 2 can be determined according to the actual required battery string spacing. For example, the width of the insulating reflective strip 2 can be 200μm-500μm, including the values at both ends. In this embodiment, by providing an extremely thin insulating reflective strip 2 between the battery strings, the battery string spacing can be reduced from 1900μm to 200μm-500μm, which can reduce the battery string spacing by 70%-90%.
[0032] Based on the above embodiments, the utility model sets an insulating reflective strip between adjacent battery strings to separate the battery strings to avoid short circuits between adjacent battery strings. By controlling the width of the insulating reflective strip, the battery string spacing can be controlled, which can greatly reduce the battery string spacing, increase the light effective area, thereby improving the light utilization rate, and then improve the module power and module conversion efficiency, and can also reduce production costs; at the same time, the two sides of the insulating reflective strip close to the battery cell are designed as a wavy embossed reflective structure, and the height of the insulating reflective strip is higher than the height of the battery cell. When sunlight is not vertically incident on the surface of the battery cell, part of the sunlight can be reflected by the insulating reflective strip. The embossed reflective structure can reflect the reflected part of the sunlight to the battery cell on the same side, and by increasing the reflection of light, more light is reflected to the battery cell, thereby improving the light utilization rate, and then improving the module power and module conversion efficiency. In addition, the two sides of the insulating reflective strip close to the battery cell are designed as a wavy embossed reflective structure, which can also prevent the isolated battery cell and the insulating reflective strip from slipping.
[0033] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of a photovoltaic module provided by an embodiment of the utility model. A photovoltaic module provided by this embodiment may include: a back plate 51, a back adhesive film 52, a battery string layer 53, a front adhesive film and a front plate 55 arranged in sequence along the thickness direction; the battery string layer 53 includes at least two battery strings; and an insulating reflective strip as described in any of the above items is arranged between adjacent battery strings.
[0034] This embodiment does not limit the specific type of the back plate 51, which may include but is not limited to back plate glass. This embodiment does not limit the specific type of the front plate 55, which may include but is not limited to front plate glass.
[0035] This embodiment can adopt any of the insulating reflective strips mentioned in the above embodiments. The specific structure of the insulating reflective strip is not described here in detail, and the above embodiments of the insulating reflective strip can be referred to.
[0036] Please refer to Figure 4 and Figure 5 , Figure 4 A schematic diagram of the arrangement of an insulating reflective strip in a photovoltaic module provided by an embodiment of the utility model; Figure 5A schematic diagram of the structure of a back adhesive film provided for an embodiment of the utility model. Furthermore, in order to prevent the insulating reflective strip 2 from moving, in this embodiment, one end of the insulating reflective strip 2 can be fixedly connected to the back plate 51; accordingly, the other end of the insulating reflective strip 2 passes through the hole 521 on the back adhesive film 52. It should be noted that the purpose of punching holes in the back adhesive film 52 is to expose the insulating reflective strip 2, so that the insulating reflective strip 2 can separate the battery strings and exceed the height of the battery cell 1, so as to reflect sunlight to the battery cell 1 through the exceeding part, thereby improving light utilization. At the same time, since the insulating reflective strip 2 is arranged between the battery strings, the space between the battery strings is more substantial, and the amount of the back adhesive film 52 and the front adhesive film 54 used for filling and bonding can be reduced, thereby reducing production costs.
[0037] This embodiment does not limit the specific connection method between the insulating reflective strip 2 and the back plate 51, as long as the insulating reflective strip 2 can be fixed to the back plate 51. For example, hot melt adhesive can be coated on the surface of the back plate 51 at a position corresponding to the insulating reflective strip, so that the insulating reflective strip 2 can be bonded and fixed to the back plate 51 by the hot melt adhesive.
[0038] Based on the above embodiments, the utility model sets an insulating reflective strip between adjacent battery strings to separate the battery strings to avoid short circuits between adjacent battery strings. By controlling the width of the insulating reflective strip, the battery string spacing can be controlled, which can greatly reduce the battery string spacing, increase the light effective area, thereby improving the light utilization rate, and then improve the module power and module conversion efficiency, and can also reduce production costs; at the same time, the two sides of the insulating reflective strip close to the battery cell are designed as a wavy embossed reflective structure, and the height of the insulating reflective strip is higher than the height of the battery cell. When sunlight is not vertically incident on the surface of the battery cell, part of the sunlight can be reflected by the insulating reflective strip. The embossed reflective structure can reflect the reflected part of the sunlight to the battery cell on the same side, and by increasing the reflection of light, more light is reflected to the battery cell, thereby improving the light utilization rate, and then improving the module power and module conversion efficiency. In addition, the two sides of the insulating reflective strip close to the battery cell are designed as a wavy embossed reflective structure, which can also prevent the isolated battery cell and the insulating reflective strip from slipping.
[0039] In order to make the present invention easier to understand, the following also provides Figure 3 , Figure 4 and Figure 5 One of the preparation processes of the photovoltaic module shown. Compared with the conventional photovoltaic module preparation process, the photovoltaic module preparation process of this embodiment requires processing of the back plate 51 and the back adhesive film 52. Specifically, it includes the following steps:
[0040] 1. During the assembly preparation process, the backplane 51 is the carrier platform in the preparation process. The operator transports the backplane 51 (the backplane glass is used in this embodiment) to the loading port of the mounter. The mounter performs laser positioning on the backplane glass, calculates the position of the insulating reflective strip 2 on the backplane glass according to the size of the backplane glass, the size of the battery cell 1 and the battery string spacing requirements, and applies a layer of hot melt adhesive on the corresponding position to fix the insulating reflective strip 2; the insulating reflective strip 2 used in this embodiment is an extremely thin insulating reflective strip 2 with a width of 200μm-500μm (including the values at both ends);
[0041] 2. The operator uses a cutting machine to take the appropriate back film 52, and uses the placement machine data to make holes on the back film 52 at positions corresponding to the insulating reflective strips 2;
[0042] 3. Lay the back adhesive film 52 with holes on the back plate 51 glass with the insulating reflective strip 2, and adjust the position to ensure that the insulating reflective strip 2 can be exposed from the hole 521 on the back adhesive film 52;
[0043] 4. Adjust the parameters of the string swinging machine, and swing the battery string close to the insulating reflective strip 2, so that the battery string spacing is controlled to the width of the insulating reflective strip 2; and the height of the insulating reflective strip 2 is higher than the height of the battery cell 1;
[0044] 5. After the battery string is placed, cut the front adhesive film 54 and lay it on the battery string layer 53, and then cover it with a front plate 55 (a front plate glass is used in this embodiment);
[0045] 6. After adding the front glass, seal the edges and send it to the laminating machine for lamination;
[0046] 7. After lamination is completed, proceed with frame assembly and other processes according to the conventional photovoltaic module preparation process.
[0047] In this embodiment, an extremely thin insulating reflective strip 2 is installed on the back glass by using a positioning and dispensing method, and at the same time, the back adhesive film 52 is also positioned and opened at the corresponding position and laid on the back glass to expose the insulating reflective strip 2; then the battery string is placed on the back adhesive film 52 in sequence according to the layout positioning method, so that the battery string is close to the insulating reflective strip 2, and the battery string is separated by the extremely thin insulating reflective strip 2, so that the ultra-small gap between the battery strings is achieved, thereby improving the light utilization rate, thereby improving the component power and component conversion efficiency, and can also reduce production costs. At the same time, since the two sides of the set insulating reflective strip 2 are designed as a wave-shaped embossed reflective structure, on the one hand, it can prevent the isolated battery cell 1 from slipping with the insulating reflective strip 2; on the other hand, it can increase the reflection of light, so that more light is reflected on the battery cell 1, thereby further improving the light utilization rate.
[0048] The above is a detailed introduction to an insulating reflective strip and a photovoltaic module provided by the present invention. For a person skilled in the art, according to the idea of the embodiments of the present invention, there may be changes in the specific implementation method and the scope of application. In summary, the content of this specification should not be understood as a limitation on the present invention.
Claims
1. An insulating reflective strip, characterized in that: Used to space adjacent battery cells in the arrangement direction of adjacent battery strings; the side of the insulating reflective strip close to the battery cell has an embossed reflective structure; the height of the insulating reflective strip is higher than the height of the battery cell.
2. The insulating reflective strip according to claim 1, characterized in that: include: At least two of the insulating reflective strips are arranged at intervals along the extending direction of the battery string.
3. The insulating reflective strip according to claim 1, characterized in that: The insulating reflective strip is an integrated structure made of a uniform material.
4. The insulating reflective strip according to claim 3, characterized in that: The insulating reflective strip is a transparent thermoplastic polyester film.
5. The insulating reflective strip according to claim 1, characterized in that: The height of the insulating reflective strip is 180 μm-250 μm, including the values at both ends.
6. The insulating reflective strip according to any one of claims 1 to 5, characterized in that: The insulating reflective strip is close to the adjacent battery slices, so that the spacing between adjacent battery strings is equal to the width of the insulating reflective strip.
7. The insulating reflective strip according to claim 6, characterized in that: The width of the insulating reflective strip is 200 μm-500 μm, including the values at both ends.
8. A photovoltaic module, characterized in that: include: A back plate, a back film, a battery string layer, a front film and a front plate are sequentially arranged along the thickness direction; The battery string layer includes at least two battery strings; the insulating reflective strip according to any one of claims 1 to 7 is arranged between adjacent battery strings.
9. The photovoltaic module according to claim 8, characterized in that: One end of the insulating reflective strip is fixedly connected to the back plate; the other end of the insulating reflective strip passes through the hole on the back adhesive film.
10. The photovoltaic module according to claim 9, characterized in that: Hot melt adhesive is coated on the surface of the back plate at positions corresponding to the insulating reflective strips.