Photovoltaic module
By setting up a toothed structure and an inclined bus bar in the photovoltaic module, the problem of low light utilization rate of the bus bar is solved, and uniform reflection of light and the improvement of power generation efficiency are achieved.
Patent Information
- Application Number
- CN202422353272.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-09-26
AI Technical Summary
The light utilization rate reflected by the bus bar in existing photovoltaic modules is low, which affects the power generation efficiency of photovoltaic modules.
A toothed structure is provided on the light-oriented surface of the bus bar, and the width direction of the bus bar is inclined with respect to the back plate. One side or middle part of the bus bar is raised by the rubber bar to form a stepped toothed structure to improve the reflection distance and uniformity of the light.
The utilization rate of light and the power generation efficiency of photovoltaic modules are improved, and the light is avoided from being concentrated in the bus bar, which enhances the overall reflection of light onto the battery string.
Smart Images
Figure CN223246971U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic component. Background Art
[0002] Photovoltaic modules are the core part of solar power generation systems, and their function is to convert solar energy into electrical energy. The composition structure of photovoltaic modules is generally composed of materials such as film, welding ribbon, busbar, frame, glass, junction box, etc. to encapsulate the cells to form photovoltaic modules. Welding ribbon and busbar: Interconnecting welding ribbon is used to connect photovoltaic cells and collect and transmit the current of photovoltaic cells; busbar refers to a composite conductive material formed by coating a certain thickness of tin-based solder on the surface of a certain size of copper strip, which is used for series or parallel connection of photovoltaic cells. As a connecting device, the welding ribbon plays the role of conductive collection and electricity collection, and collects and transmits the current generated by the cell and then introduces it into the junction box, which is used to connect photovoltaic cell strings and junction boxes, and transmit the current of photovoltaic cell strings; the more light irradiated on the cell, the higher the power generation efficiency of the photovoltaic module. How to improve the utilization rate of light is a technical problem that technicians in this field urgently need to solve. Utility Model Content
[0003] The purpose of the utility model is to provide a photovoltaic assembly to solve the technical problem of low utilization rate of light reflected by a bus bar in the prior art.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A photovoltaic module comprises a backsheet, a panel, and a battery string and a busbar disposed between the backsheet and the panel, wherein a rubber strip is provided between the busbar and the backsheet, and the rubber strip is capable of tilting the width direction of the busbar relative to the backsheet;
[0006] A plurality of tooth-shaped structures are provided on the light-facing surface of the busbar.
[0007] Furthermore, the tooth-shaped structure includes a plurality of saw teeth arranged along the width direction of the busbar, and each saw tooth has a reflective surface on a side close to the battery string, and the angle between the reflective surface and the back plate is 30° to 45°.
[0008] Furthermore, the angle between the reflective surface and the back plate increases from high to low.
[0009] Furthermore, each of the saw teeth has a connecting surface connected to the reflective surface, and the angle between the connecting surface and the back plate is 30° to 90°.
[0010] Furthermore, there are gaps between the back plate, the bus bar and the rubber strip.
[0011] Furthermore, a glue groove is provided on the backlight surface of the busbar, and one end of the glue strip is provided in the glue groove.
[0012] Furthermore, anti-slip lines are provided in the glue groove.
[0013] Furthermore, the maximum vertical distance between the bus bar and the back plate is 0.35 mm, and the minimum vertical distance between the bus bar and the back plate is 0.25 mm.
[0014] Furthermore, there are multiple bus bars, and the multiple bus bars include a middle bus bar, and the battery strings are respectively provided on both sides of the middle bus bar along the width direction, and the middle bus bar is inclined from top to bottom from the middle to both sides.
[0015] Furthermore, there are multiple bus bars, and the multiple bus bars include edge bus bars, and the battery string is only provided on one side of the edge bus bar along the width direction, and the edge bus bar is inclined from top to bottom from the side away from the battery string to the side close to the battery string.
[0016] Beneficial effects of the utility model:
[0017] The photovoltaic module provided by the present invention includes a backboard, a panel, and a battery string and a bus bar arranged between the backboard and the panel. A rubber strip is placed between the bus bar and the backboard, and the rubber strip can make the width direction of the bus bar tilt relative to the backboard; a tooth-shaped structure is provided on the light-facing surface of the bus bar.
[0018] In the photovoltaic module provided by the present application, a tooth-shaped structure is provided on the light-facing surface of the busbar. Through this tooth-shaped structure, light perpendicularly irradiated on the light-facing surface of the busbar can be reflected onto the panel, and then reflected onto the battery string through the panel. The rubber strip between the busbar and the backplane can tilt the width direction of the busbar relative to the backplane. The above arrangement, on the one hand, makes the tooth-shaped structure distributed in a stepped manner, alleviating the problem of light reflecting back and forth between two adjacent saw teeth, which is conducive to the reflection of light toward the battery string. On the other hand, it increases the reflection distance of light, avoids light concentration on the periphery of the busbar, and makes light fully reflected onto the battery string, thereby achieving the purpose of improving light utilization and photovoltaic module power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0020] Figure 1 A schematic diagram of the structure of a photovoltaic module provided by an embodiment of the present utility model;
[0021] Figure 2 A schematic diagram of the installation structure of the intermediate bus bar provided in an embodiment of the present utility model;
[0022] Figure 3 A schematic diagram of the installation structure of the edge bus bar provided in an embodiment of the present utility model;
[0023] Figure 4 A schematic cross-sectional view of an edge bus bar provided in an embodiment of the present invention.
[0024] icon:
[0025] 1-backplane; 2-panel; 3-cell string; 4-busbar; 41-reflective surface; 42-connection surface; 43-glue groove; 5-glue strip; 6-gap. DETAILED DESCRIPTION
[0026] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0027] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0028] It should be noted that, in the description of this utility model, the terms "connection" and "installation" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; direct connection or connection through an intermediate medium; mechanical connection or electrical connection. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.
[0029] The utility model provides a photovoltaic component, referring to Figure 1The photovoltaic module includes a backboard 1, a panel 2, and a battery string 3 and a busbar 4 arranged between the backboard 1 and the panel 2. A rubber strip 5 is placed between the busbar 4 and the backboard 1. The rubber strip 5 can make the width direction of the busbar 4 tilt relative to the backboard 1; a tooth structure is provided on the light-facing surface of the busbar 4.
[0030] Figure 1 The dotted line in the figure represents the reflection path of the light. In the figure, the incident light is perpendicular to the panel 2. It should be noted that in actual use, the incident angle of the light relative to the panel 2 is not limited to 90°. Figure 1 In the photovoltaic module provided by the present application, a tooth-shaped structure is provided on the light-facing surface of the busbar 4. Through the tooth-shaped structure, the light irradiated on the light-facing surface of the busbar 4 can be reflected onto the panel 2, and then reflected onto the battery string 3 through the panel 2. The rubber strip 5 between the busbar 4 and the backplate 1 can make the width direction of the busbar 4 tilt relative to the backplate 1. The above arrangement, on the one hand, makes the tooth-shaped structure distributed in a stepped manner, alleviating the problem of light reflecting back and forth between two adjacent saw teeth, which is conducive to the reflection of light toward the battery string 3. On the other hand, it increases the reflection distance of light, avoids the light from concentrating on the periphery of the busbar 4, and makes the light fully reflected onto the battery string 3, thereby achieving the purpose of improving the light utilization rate and the power generation efficiency of the photovoltaic module.
[0031] Continue to refer to Figure 1 The maximum vertical distance between busbar 4 and backsheet 1 is 0.35mm, and the minimum vertical distance between busbar 4 and backsheet 1 is 0.25mm. Taking the photovoltaic module placed parallel to the horizontal plane as an example, the vertical distance between the highest point of busbar 4 and backsheet 1 is 0.35mm, and the vertical distance between the lowest point of busbar 4 and backsheet 1 is 0.25mm.
[0032] Furthermore, there are multiple bus bars 4, and the multiple bus bars 4 include middle bus bars and edge bus bars, wherein:
[0033] Reference Figure 2 , battery strings 3 are respectively arranged on both sides of the middle busbar along the width direction, and the middle busbar is inclined from top to bottom from the middle to both sides;
[0034] Reference Figure 3 The edge bus bar is only provided with a battery string 3 on one side along the width direction, and the edge bus bar is inclined from top to bottom from the side away from the battery string 3 to the side close to the battery string 3.
[0035] Because battery strings 3 are located on both sides of the center busbar, the rubber strip 5 is placed between the center of the center busbar and the backplane 1, forming a shape with a higher center and lower sides. This allows the center busbar to reflect light toward the battery strings 3 on both sides. Since battery strings 3 are only located on one side of the edge busbar, the rubber strip 5 is placed on the side of the edge busbar away from the battery string 3, ensuring that the edge busbar reflects light only toward the battery string 3, further improving light utilization.
[0036] Reference Figure 2 and Figure 3 The tooth-shaped structure includes a plurality of saw teeth arranged along the width direction of the busbar 4.
[0037] Reference Figure 2 For the middle busbar, the serrations are distributed in a stepped pattern from the middle to both sides. Figure 3 For the edge busbar, the serrations are distributed in a stepped manner from high to low from the side away from the battery string 3 to the side close to the battery string 3 .
[0038] The structures of the middle bus bar and the edge bus bar are similar. The structure of the bus bar 4 is described below using the edge bus bar as an example.
[0039] Reference Figure 3 Each sawtooth has a reflective surface 41 on the side closest to the battery string 3. The angle a between the reflective surface 41 and the backsheet 1 is between 30° and 45°. If the angle a exceeds 45°, light from the busbar 4 will not be reflected back to the panel 2. If the angle a is less than 30°, some of the light from the busbar 4 will be reflected back to the panel 2. Therefore, if the angle a exceeds this range, the light will not be fully reflected back to the battery string 3.
[0040] Furthermore, the angle a between the reflective surface 41 and the backplane 1 increases from high to low. That is, the angle a increases as it approaches the battery string 3. According to the principle of light reflection, the larger the angle a, the greater the distance the light is reflected onto the battery string 3. By increasing the angle a as it approaches the battery string 3, the present application can increase the reflection distance of the light and simultaneously make the light more evenly reflected onto the battery string 3, avoiding light concentration and further improving light utilization.
[0041] For example, Figure 3 The middle angles a1, a2, a3, and a4 are 43°, 38°, 32°, and 30°, respectively.
[0042] Continue to refer to Figure 3Each sawtooth also has a connecting surface 42 connected to the reflective surface 41. The angle b between the connecting surface 42 and the back plate 1 is 30° to 90°, preferably 30° to 60°. If the angle b is less than 30°, the area of the reflective surface 41 is reduced while the sawtooth height remains unchanged, and the reflected light is also reduced accordingly. If the angle b is greater than 60°, the sawtooth is difficult to roll into shape, and the groove depth between two adjacent sawtooths is large, affecting the structural strength of the busbar 4.
[0043] Continue to refer to Figure 3 There is a gap 6 between the back plate 1, the bus bar 4 and the adhesive strip 5. The provision of the gap 6 is conducive to the discharge of bubbles during the lamination process.
[0044] Reference Figure 3 and Figure 4 The angle a between the reflective surface 41 and the back panel 1 is approximately equal to the sum of the angle between the reflective surface 41 and the bottom surface of the busbar 4 and the angle between the top and bottom surfaces of the rubber strip 5. The angle b between the connecting surface 42 and the back panel 1 is approximately equal to the difference between the angle between the connecting surface 42 and the bottom surface of the busbar 4 and the angle between the top and bottom surfaces of the rubber strip 5.
[0045] For example, the angle between the top surface and the bottom surface of the rubber strip 5 is 15°, the angles a1, a2, a3, and a4 are 43°, 38°, 32°, and 30°, respectively, and the corresponding angles between the reflective surface 41 and the bottom surface of the busbar 4 are 28°, 23°, 17°, and 15°, respectively; the angle b between the connecting surface 42 and the back panel 1 is 30°, and the angle between the connecting surface 42 and the bottom surface of the busbar 4 is 45°.
[0046] Continue to refer to Figure 4 The backlight surface of busbar 4 is provided with a glue groove 43, into which one end of rubber strip 5 is disposed. Anti-slip groove 43 is provided. This groove and the anti-slip groove prevent relative displacement between busbar 4 and rubber strip 5, making it easier for workers to place rubber strip 5 in the designated position and improving the installation accuracy of busbar 4.
[0047] In this embodiment, the tooth-shaped structure and the glue groove 43 on the busbar 4 are formed by rolling.
[0048] In summary, the photovoltaic module provided by the present application raises one side or the middle of the busbar 4 by means of the adhesive strip 5, thereby increasing the reflection distance of the busbar 4 without changing the cross-sectional area of the busbar 4, avoiding the concentration of light on the periphery of the busbar 4, and making the light more comprehensively reflected on the battery string 3, thereby achieving the purpose of improving the light utilization rate and the power generation efficiency of the photovoltaic module. Since the cross-sectional area of the busbar 4 remains basically unchanged, the resistance and material usage of the busbar 4 remain unchanged, and its conductive performance and cost are not affected. In addition, the busbar 4 provided in this embodiment can be made by rolling the existing busbar, and does not need to be re-prepared, which has the advantages of easy processing and low cost. The adhesive strip 5 can be made of factory residual adhesive film and / or backboard strips, which almost does not increase the cost.
[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A photovoltaic module comprising a backsheet (1), a panel (2), and a battery string (3) and a busbar (4) arranged between the backsheet (1) and the panel (2), characterized in that: A rubber strip (5) is provided between the bus bar (4) and the back plate (1), and the rubber strip (5) can tilt the width direction of the bus bar (4) relative to the back plate (1); a tooth-shaped structure is provided on the light-facing surface of the bus bar (4).
2. The photovoltaic module according to claim 1, characterized in that The tooth-shaped structure comprises a plurality of saw teeth arranged along the width direction of the busbar (4), each saw tooth having a reflective surface (41) on a side close to the battery string (3), and an angle between the reflective surface (41) and the back plate (1) is 30° to 45°.
3. The photovoltaic module according to claim 2, characterized in that The angle between the reflective surface (41) and the back plate (1) increases from high to low.
4. The photovoltaic module according to claim 2, characterized in that Each of the saw teeth further comprises a connecting surface (42) connected to the reflective surface (41), and the angle between the connecting surface (42) and the back plate (1) is 30° to 90°.
5. The photovoltaic module according to claim 1, characterized in that There is a gap (6) between the back plate (1), the bus bar (4) and the rubber strip (5).
6. The photovoltaic module according to claim 1, characterized in that A glue groove (43) is provided on the backlight surface of the bus bar (4), and one end of the glue strip (5) is provided in the glue groove (43).
7. The photovoltaic module according to claim 6, characterized in that: The glue groove (43) is provided with anti-slip lines.
8. The photovoltaic module according to claim 1, characterized in that The maximum vertical distance between the bus bar (4) and the back plate (1) is 0.35 mm, and the minimum vertical distance between the bus bar (4) and the back plate (1) is 0.25 mm.
9. The photovoltaic module according to any one of claims 1 to 8, characterized in that: The number of the busbars (4) is multiple, and the multiple busbars (4) include a middle busbar, and the battery strings (3) are respectively provided on both sides of the middle busbar in the width direction, and the middle busbar is inclined from top to bottom from the middle to both sides.
10. The photovoltaic module according to any one of claims 1 to 8, characterized in that: The number of the busbars (4) is plural, and the plural busbars (4) include edge busbars, wherein the battery string (3) is provided on only one side of the edge busbar along the width direction, and the edge busbar is inclined from top to bottom from a side away from the battery string (3) to a side close to the battery string (3).