Photovoltaic module with reflective bus bar

Abstract

The utility model discloses a photovoltaic assembly with reflective bus bars, which belongs to the field of photovoltaic technology and comprises a plurality of bus bars and a plurality of battery pieces, and the plurality of bus bars and the battery pieces are electrically connected with each other and packaged between a front cover plate and a rear cover plate. The light receiving surface of the bus bar is coated with an adhesive, the surface of the adhesive is uneven, and a plurality of reflective metal particles are fixedly connected through the adhesive. According to the utility model, the light-receiving surface of the bus bar is coated with the adhesive and fixedly connected with the reflective metal particles to form the concave-convex reflective structure, so that compared with the existing embossed V-shaped groove scheme, the bus bar has the advantages that the conductive sectional area is prevented from being damaged by embossing, and the current-carrying capability is ensured; thick adhesive film filling is not needed, and the packaging cost is reduced; the concave-convex structure is combined with the reflective particles through the adhesive, thereby enhancing the diffuse reflection of sunlight, improving the light receiving ratio of the cell, improving the power of the assembly, and avoiding the risk of assembly failure caused by the direct contact between the bus bar and the glass.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic technology, and in particular relates to a photovoltaic module with reflective busbars. Background Technology

[0002] In photovoltaic modules, busbars are used to connect cell strings and transmit current. In existing technology, reflective busbars typically achieve their reflective function by embossing a V-groove on the front of the busbar; however, this approach has significant drawbacks:

[0003] 1. The V-groove structure reduces the effective conductive cross-sectional area of ​​the busbar, resulting in a decrease in current carrying capacity;

[0004] 2. To fill the gap between the V-groove and the glass, a thicker adhesive film is required, which increases the encapsulation cost;

[0005] 3. Embossing may cause the busbar to come into direct contact with the glass, which may pose a risk of component failure.

[0006] To address this, a photovoltaic module with reflective busbars is proposed. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model proposes a photovoltaic module with reflective busbars.

[0008] To achieve the above objectives, this utility model provides a photovoltaic module with a reflective busbar, comprising:

[0009] A plurality of busbars and a plurality of battery cells, wherein the plurality of busbars and the plurality of battery cells are electrically connected to each other and are encapsulated between a front cover and a rear cover;

[0010] The light-receiving surface of the busbar is coated with an adhesive. The adhesive has an uneven surface and a number of reflective metal particles are fixed to it.

[0011] Preferably, the adhesive is a photoinitiator, and a plurality of the reflective metal particles are sprayed onto the adhesive and cured onto the adhesive by light.

[0012] Preferably, the adhesive surface is formed into an uneven surface by calendering.

[0013] Preferably, a plurality of the solar cells are arranged in a rectangular array, the solar cells in the same column are electrically connected by interconnecting strips, and a plurality of solar cells in a row are electrically connected by busbars.

[0014] Preferably, the front cover includes an upper glass plate and an upper EVA layer, which are arranged sequentially from top to bottom.

[0015] Preferably, the rear cover plate includes a lower EVA layer and a lower glass plate, which are arranged sequentially from top to bottom.

[0016] Preferably, a reflective glaze is provided below the lower glass plate for reflecting light.

[0017] Preferably, the reflective glaze is applied to the bottom surface of the lower glass plate.

[0018] Compared with the prior art, the present invention has the following advantages and technical effects:

[0019] By coating the light-receiving surface of the busbar with an adhesive and fixing reflective metal particles, an uneven reflective structure is formed. Compared with the existing technology that achieves reflection through embossing V-grooves, this has significant technical advantages: First, this structure avoids the destruction of the effective conductive cross-sectional area of ​​the busbar by the embossing process, ensuring that the current carrying capacity is not affected; second, it does not require thick adhesive film to fill the grooves, and low-thickness adhesive film can be used for encapsulation, reducing the cost of adhesive film; at the same time, the uneven structure, combined with the adhesive and reflective metal particles, can effectively achieve diffuse reflection of sunlight, reflecting the light to the solar cells, increasing the light-receiving ratio of the solar cells, thereby increasing the maximum power of the photovoltaic module, and avoiding the risk of module failure caused by direct contact between the busbar and the glass. Attached Figure Description

[0020] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a photovoltaic module with reflective busbars according to this utility model;

[0022] Figure 2 This is a schematic diagram of the busbar structure in this utility model;

[0023] Figure 3 for Figure 2 A magnified view of A in the middle.

[0024] In the diagram: 1. Busbar; 2. Battery cell; 3. Front cover; 4. Rear cover; 5. Adhesive; 6. Reflective metal particles; 301. Upper glass plate; 302. Upper EVA layer; 401. Lower EVA layer; 402. Lower glass plate; 403. Reflective glaze. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Glossary: ​​EVA (ethylene-vinyl acetate copolymer) is a film material used in the encapsulation process of photovoltaic modules. It is mainly used to bond the front cover, cell array, and rear cover to form a sealed module structure. The encapsulation of the module is achieved through the adhesive effect of the EVA layer, while also providing light transmission, weather resistance, and protection for the internal structure.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figures 1 to 3 As shown, this embodiment provides a photovoltaic module with a reflective busbar, comprising:

[0029] A plurality of busbars 1 and a plurality of battery cells 2 are electrically connected to each other and are encapsulated between a front cover plate 3 and a rear cover plate 4.

[0030] The light-receiving surface of the busbar 1 is coated with an adhesive 5. The surface of the adhesive 5 is uneven, and several reflective metal particles 6 are fixed to it by the adhesive 5.

[0031] By coating the light-receiving surface of the busbar 1 with adhesive 5 and fixing reflective metal particles 6, an uneven reflective structure is formed. Compared with the existing technology that achieves reflection through embossing V-grooves, this has significant technical advantages: First, this structure avoids the destruction of the effective conductive cross-sectional area of ​​the busbar 1 by the embossing process, ensuring that the current carrying capacity is not affected; second, it does not require thick adhesive film to fill the grooves, and low-thickness adhesive film can be used for encapsulation, reducing the cost of adhesive film; at the same time, the uneven structure, combined with adhesive 5 and reflective metal particles 6, can effectively achieve diffuse reflection of sunlight, reflecting the light to the solar cell 2, increasing the light-receiving ratio of the solar cell 2, thereby increasing the maximum power of the photovoltaic module, and avoiding the risk of module failure caused by direct contact between the busbar 1 and the glass.

[0032] The scheme is further optimized by using adhesive 5 as a photoinitiator and spraying several reflective metal particles 6 onto adhesive 5 and curing them onto adhesive 5 by light.

[0033] Furthermore, the adhesive 5 is preferably a photoinitiator such as photoinitiator 1173 or photoinitiator DETX.

[0034] By utilizing the photocuring properties of photoinitiators, the reflective metal particles 6 and busbar 1 can be quickly and firmly bonded together, avoiding the damage to the structure of busbar 1 caused by traditional embossing processes. The photocuring process is simple to operate and has high curing efficiency, which can significantly improve production efficiency. At the same time, it ensures the stability of the uneven structure formed by the adhesive 5, making the reflective metal particles 6 less likely to fall off, thereby maintaining the diffuse reflection effect of sunlight for a long time. While improving the light-receiving efficiency of photovoltaic modules, it avoids the problems of reduced current carrying capacity and increased encapsulation costs caused by structural defects.

[0035] The solution was further optimized by calendering the surface of adhesive 5 into an uneven surface.

[0036] The calendering process allows for precise control of the surface texture and angle of the adhesive 5, forming a reflective surface with a specified reflection direction. Compared to the fixed V-groove formed by embossing the busbar 1 in existing technologies, this structure enhances the directional reflection efficiency of sunlight through a regular textured surface, while avoiding damage to the busbar 1's main structure and ensuring that the current carrying capacity remains unaffected. At the same time, the calendered adhesive 5 surface does not require thick film filling, making it suitable for low-thickness film encapsulation. This reduces encapsulation costs and avoids the risk of component failure due to direct contact between the busbar 1 and the glass. Furthermore, this process enables standardized production of reflective structures, improving the consistency and reliability of the reflective effect.

[0037] In a further optimized scheme, several solar cells 2 are arranged in a rectangular array, with solar cells 2 in the same column electrically connected by interconnecting strips, and several solar cells 2 in a row electrically connected by busbars 1.

[0038] The rectangular array arrangement maximizes the use of the encapsulation space, ensuring a uniform distribution of the light-receiving area of ​​the solar cells 2. Combined with the reflective effect of the reflective busbars 1, it effectively improves the overall light-receiving efficiency of the solar cells 2. The layered connection structure of the interconnecting bars and busbars 1 forms a regular current transmission path, reducing circuit connection resistance, improving current collection and transmission efficiency, and avoiding power loss caused by messy connections. This arrangement facilitates standardized production and assembly, significantly improving the production efficiency of photovoltaic modules. At the same time, the regular array structure and the reflective busbars 1 work together to further enhance the power output stability and reliability of the modules.

[0039] The design is further optimized so that the front cover 3 includes an upper glass plate 301 and an upper EVA layer 302, which are arranged sequentially from top to bottom.

[0040] The upper glass plate 301 serves as a light-transmitting protective layer, effectively resisting external impacts and environmental erosion while ensuring high light transmittance to guarantee sunlight penetration. The upper EVA layer, as an encapsulant layer, achieves sealed encapsulation of the module through bonding with the glass plate and the battery array. This structure is also compatible with low-thickness EVA encapsulant film designs, avoiding the problem of thick encapsulant film filling required for the embossed V-groove of the busbar 1 in existing technologies. While reducing the cost of the encapsulant film, the synergistic effect of the upper glass plate 301 and the upper EVA layer enhances the structural stability and weather resistance of the module, reduces the risk of module failure caused by moisture penetration, and further optimizes light utilization by reflecting light through the reflective busbar 1.

[0041] The design is further optimized so that the rear cover 4 includes a lower EVA layer 401 and a lower glass plate 402, which are arranged sequentially from top to bottom.

[0042] The lower EVA layer, as an adhesive film layer, can tightly bond the battery array to the lower glass plate 402, achieving a sealed encapsulation on the back of the module. This structure is suitable for low-thickness EVA film designs, avoiding the problem of thick adhesive film filling required due to the embossing of busbar 1 in existing technologies, thus reducing encapsulation costs. The lower glass plate 402, as the main body of the back cover, provides mechanical support and resistance to environmental erosion for the module, ensuring the structural stability of the module for long-term use. At the same time, the composite structure of the lower EVA layer and the lower glass plate 402 can effectively block the penetration of water vapor and oxygen, reducing the risk of oxidation of the battery cell 2 and circuit failure. Together with the front cover plate 3 structure, it forms a complete protection system, improving the weather resistance of the module while ensuring the long-term stability of the reflective effect of the reflective busbar 1.

[0043] To further optimize the design, a reflective glaze 403 is provided below the lower glass plate 402 for reflecting light.

[0044] The reflective glaze 403 can reflect the light transmitted through the lower glass plate 402 back to the cell 2 area, forming a two-way reflective system with the reflective structure of the busbar 1, further improving the utilization rate of sunlight and increasing the amount of light received by the cell 2 to improve the module power. The reflective glaze 403 is coated on the bottom surface of the lower glass plate 402. The process is simple and low cost, and it can be achieved without changing the existing encapsulation process. At the same time, the glaze itself has weather resistance and wear resistance. While enhancing the light reflection effect, it can protect the lower glass plate 402 from environmental corrosion and extend the service life of the module. Moreover, this structure does not affect the current carrying capacity of the busbar 1 and the film thickness design, avoiding the cost increase and performance loss problems caused by the embossing process in the existing technology.

[0045] The design was further optimized by coating the bottom surface of the lower glass plate 402 with a reflective glaze 403.

[0046] This design allows the reflective glaze 403 to directly face the external environment. This maximizes light reflection efficiency through the smooth and flat surface of the glaze, precisely reflecting light transmitted through the lower glass plate 402 back to the cell 2 area, forming a synergistic reflective system with the reflective structure of the busbar 1, further improving light energy utilization. Furthermore, the lower glass plate 402 serves as a supporting carrier, making the coating process of the reflective glaze 403 easier to control, ensuring glaze uniformity and stability. In addition, this structure does not require changes to the photovoltaic module's encapsulation process or core materials. Through optimized glaze design, it can increase module power without increasing current-carrying losses in the busbar 1 or the cost of the encapsulant film, combining practicality and economy.

[0047] Any aspects of this utility model that are not detailed herein are conventional technical means known to those skilled in the art.

[0048] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0049] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A photovoltaic module with reflective busbars, characterized in that, include: A plurality of busbars (1) and a plurality of battery cells (2), wherein the plurality of busbars (1) and the battery cells (2) are electrically connected to each other and are encapsulated between a front cover plate (3) and a rear cover plate (4); The light-receiving surface of the busbar (1) is coated with an adhesive (5), the surface of the adhesive (5) is uneven, and several reflective metal particles (6) are fixed to it through the adhesive (5).

2. The photovoltaic module with reflective busbar according to claim 1, characterized in that: The adhesive (5) is a photoinitiator, and a number of the reflective metal particles (6) are sprayed onto the adhesive (5) and cured onto the adhesive (5) by light.

3. The photovoltaic module with reflective busbar according to claim 1, characterized in that: The adhesive (5) has an uneven surface formed by calendering.

4. The photovoltaic module with reflective busbar according to claim 1, characterized in that: A number of the battery cells (2) are arranged in a rectangular array. The battery cells (2) in the same column are electrically connected by interconnecting strips, and the battery cells (2) in a row are electrically connected by busbars (1).

5. The photovoltaic module with reflective busbar according to claim 1, characterized in that: The front cover (3) includes an upper glass plate (301) and an upper EVA layer (302), which are arranged sequentially from top to bottom.

6. The photovoltaic module with reflective busbar according to claim 1, characterized in that: The rear cover plate (4) includes a lower EVA layer (401) and a lower glass plate (402), which are arranged sequentially from top to bottom.

7. The photovoltaic module with reflective busbar according to claim 6, characterized in that: A reflective glaze (403) is provided below the lower glass plate (402) for reflecting light.

8. The photovoltaic module with reflective busbar according to claim 7, characterized in that: The reflective glaze (403) is coated on the bottom surface of the lower glass plate (402).

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