Photovoltaic module
By designing layered photovoltaic modules, using edge barrier films and transparent packaging films to improve high-voltage resistance, and realizing current collection and derivation through the bus bar packaging area, the problem that conventional photovoltaic modules cannot meet the voltage requirements of 2000V system is solved, and efficient voltage tolerance and cost reduction effects are achieved.
Patent Information
- Application Number
- CN202422149661.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-02
AI Technical Summary
Conventional photovoltaic modules do not meet the ability to withstand 2000V system voltage and cannot meet the future demand for system voltage to increase to 2000V.
A layered structure photovoltaic module is designed, including a cell packaging structure, a combo frame, a cell connection circuit and a busbar. The battery cell packaging structure improves high-voltage resistance through edge barrier film and transparent packaging film, and the bus bar packaging area realizes current collection and derivation through open hole barrier insulation film and L-shaped conductive metal matrix.
This photovoltaic module can effectively improve high voltage resistance performance, can withstand pulse voltage tests of 2000V system voltage and above 24KV, significantly reduce the system BOS cost and kilowatt-hour cost, while reducing power loss and construction operation and maintenance costs.
Smart Images
Figure CN223053368U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic modules, and particularly relates to a photovoltaic module. Background Art
[0002] A solar cell module, also known as a photovoltaic module, is one of the core components of a solar power generation system. The power generation of the photovoltaic module affects the cost per kilowatt-hour of the entire power station system. The system voltage where the photovoltaic module is located has undergone multiple upgrades and changes from 600V to 1000V and then to 1500V. Currently in the market, the system voltage resistance of the photovoltaic module is 1500V. However, in the future, the increase in system voltage will be the development direction after a period of time. If the system voltage is increased to 2000V, the installed capacity of a single module string will increase by more than 30%, significantly saving equipment usage, significantly reducing the system BOS cost and the levelized cost of energy (LCOE); and effectively reducing AC and DC line losses; reducing power loss and construction and operation and maintenance costs.
[0003] A conventional photovoltaic module is formed by encapsulating and assembling solar cells with a front panel glass, an upper encapsulation film, a lower encapsulation film, a backplane / backplane glass, silicone, and a frame material, and leading out the current according to the circuit connection with a welding tape, a bus bar, and a junction box. With the increase of the system voltage, the conventional photovoltaic modules in the current market do not meet the ability to withstand a 2000V system voltage. Therefore, it is urgent to design a module that meets the 2000V system voltage resistance. Summary of the Utility Model
[0004] The problem existing in the prior art is that the conventional photovoltaic module does not meet the ability to withstand a 2000V system voltage. In view of the above problems, the utility model provides a photovoltaic module, which is a layered structure and includes a battery encapsulation structure, a combination frame, a battery connection circuit, and a plurality of bus bars.
[0005] The bus bar is used to collect and export the current collected by the battery to the junction box.
[0006] The battery encapsulation structure is horizontally fixed in the concave parts of the combination frames arranged in parallel relative to each other on the left and right sides.
[0007] The battery encapsulation structure includes a battery. The battery can be a conventional PERC battery, a TOPCon battery, a main-gridless, rectangular battery, or can also be a whole battery, a half battery, a three-piece battery, or a multi-piece battery.
[0008] The battery is located between a first encapsulation film and a second encapsulation film, and the upper and lower surfaces of the battery are respectively bonded and fixed to the first encapsulation film and the second encapsulation film to form a pre-encapsulation structure of the battery.
[0009] Edge barrier films are provided on both sides of the pre-packaged cell structure, and the end faces of the edge barrier films adjacent to the pre-packaged cell structure are adhesively fixed.
[0010] The distance from the upper surface of the first encapsulation film to the lower surface of the second encapsulation film is equal to the thickness of the edge barrier film.
[0011] The cell encapsulation structure further includes a front plate and a back plate.
[0012] The upper surface and the lower surface of the pre-packaged cell structure are adhesively fixed to the front plate and the back plate respectively.
[0013] The end faces of the front plate and the back plate adjacent to the edge barrier film are adhesively fixed together.
[0014] The materials of the first encapsulation film and the front plate are both transparent materials.
[0015] Preferably, the width of the edge barrier film is not less than 15 mm and not more than 20 mm.
[0016] Preferably, the material of the edge barrier film is transparent butyl rubber.
[0017] Preferably, the bus bar includes a bus bar lead-out wire, a junction box, and a plurality of bus bar encapsulation areas.
[0018] Each bus bar encapsulation area includes a front plate, a first encapsulation film, an opening-blocking insulating film, a second encapsulation film, and a back plate that are adhesively fixed in sequence from top to bottom.
[0019] Openings that communicate with each other are provided at the positions corresponding to each other on the second encapsulation film, the opening-blocking insulating film, and the back plate.
[0020] The bus bar encapsulation area further includes an L-shaped conductive metal matrix.
[0021] The L-shaped conductive metal matrix includes a horizontal section and a vertical section. The horizontal section is located between the first encapsulation film and the opening-blocking insulating film, and the vertical section passes through the openings at the corresponding positions of the opening-blocking insulating film, the second encapsulation film, and the back plate in sequence.
[0022] The L-shaped conductive metal matrix forms an electrical connection with the cell, collects the current collected by the cell, and conducts it to an external circuit.
[0023] The bus bar lead-out wire is connected to the L-shaped conductive metal matrix, collects the current collected by the cell, and conducts it into the junction box.
[0024] Preferably, the material of the opening-blocking insulating film is transparent butyl rubber.
[0025] Preferably, the thickness of the opening-blocking insulating film is 0.3 - 0.7 mm.
[0026] Preferably, the front plate is made of transparent glass material.
[0027] Preferably, the back plate has a single-glass or double-glass structure.
[0028] Preferably, a kind of photovoltaic module
[0029] The thickness of the front plate is 1.6 - 3.2 mm,
[0030] The grammage of the first encapsulation film is 400 - 450 g / m 2 ,
[0031] The grammage of the second encapsulation film is 400 - 450 g / m 2 ,
[0032] When the back plate has a double-glass structure, the thickness is 1.6 - 2.0 mm; when the back plate has a single-glass structure, the thickness DTI of the insulating layer of the back plate is ≥ 450 um.
[0033] The utility model has the following beneficial effects:
[0034] (1) In the utility model, edge encapsulation films (butyl rubber) are arranged on both sides of the pre-encapsulation structure of the battery cells. The edge encapsulation films have excellent water vapor barrier property, electrical insulation property and bonding property, and can effectively improve the high-voltage resistance performance of the photovoltaic module;
[0035] (2) In the utility model, the width of the edge encapsulation film represents the creepage distance at the edge of the battery cell. The creepage distance at the edge is not less than 15 mm, which can effectively improve the voltage resistance performance of the photovoltaic module, so that the photovoltaic module obtained by the utility model can withstand a system voltage of 2000 V and a pulse voltage test of more than 24 kV; at the same time, the width of the edge encapsulation film should preferably not exceed 20 mm. Too large a size will cause waste of butyl rubber material, and because the light transmittance of butyl rubber is poor, too large a size will also cause optical loss;
[0036] (3) In the utility model, an opening-blocking insulating film layer is arranged between the first encapsulation film and the second encapsulation film in the bus bar encapsulation area. The L-shaped conductive metal matrix passes through the openings at the corresponding positions of the opening-blocking insulating film, the second encapsulation film and the back plate in sequence. The opening-blocking insulating film layer has water vapor barrier property, electrical insulation property and bonding property, and can effectively improve the high-voltage resistance performance of the photovoltaic module. Description of the Drawings
[0037] Figure 1 : It is a schematic structural diagram of a kind of photovoltaic module of the utility model.
[0038] Figure 2 : Is Figure 1 The cross-sectional structural diagram in the A-A direction in
[0039] Figure 3 : It is Figure 1 The enlarged structural schematic diagram of part B (bus bar encapsulation area) in the figure.
[0040] Figure 4 : It is Figure 1 The sectional structural schematic diagram of part B in the C-C direction in the figure.
[0041] In the figure: 1. Bus bar, 2. Front plate, 3. First encapsulation film, 4. L-shaped conductive metal substrate, 5. Open-hole barrier insulating film, 6. Second encapsulation film, 7. Rear plate, 8. Edge barrier insulating film, 9. Solar cell, 10. Combination frame, 11. Junction box. Specific embodiments
[0042] The present utility model will be described in detail below in conjunction with embodiments. However, it should be understood that the following embodiments are only illustrative examples of the implementation manners of the present utility model, rather than limiting the scope of the present utility model.
[0043] As Figures 1-4 shown, it is a photovoltaic module provided by the present utility model, which is a layered structure and includes a solar cell 9 encapsulation structure, a combination frame 10, a solar cell 9 connection circuit, and several bus bars 1.
[0044] The bus bar 1 is used to collect the current collected by the solar cell 9 and conduct it to the junction box 11.
[0045] The solar cell 9 encapsulation structure is horizontally fixed in the concave parts of the combination frames 10 arranged in parallel and opposite to each other on the left and right sides.
[0046] The solar cell 9 encapsulation structure includes a solar cell 9.
[0047] The solar cell 9 is located between the first encapsulation film 3 and the second encapsulation film 6, and the upper and lower surfaces of the solar cell 9 are respectively bonded and fixed to the first encapsulation film 3 and the second encapsulation film 6 to form a pre-encapsulation structure of the solar cell 9.
[0048] Edge barrier films are provided on both sides of the pre-encapsulation structure of the solar cell 9, and the end faces of the edge barrier films adjacent to the pre-encapsulation structure of the solar cell 9 are bonded and fixed.
[0049] The distance from the upper surface of the first encapsulation film 3 to the lower surface of the second encapsulation film 6 is equal to the thickness of the edge barrier film.
[0050] The solar cell 9 encapsulation structure further includes a front plate 2 and a back plate.
[0051] The upper and lower surfaces of the pre-encapsulation structure of the solar cell 9 are respectively bonded and fixed to the front plate 2 and the back plate.
[0052] The front plate 2 and the end faces of the back plate adjacent to the edge barrier film are adhesively fixed together.
[0053] The materials of the back plate, the first encapsulation film 3, the second encapsulation film 6, and the front plate 2 are all transparent materials.
[0054] In a specific embodiment, the width of the edge barrier film is not less than 15 mm and not greater than 20 mm.
[0055] In a specific embodiment, the material of the edge barrier film is transparent butyl rubber.
[0056] In a specific embodiment, the bus bar 1 includes a bus bar lead-out wire, a junction box 11, and a plurality of bus bar encapsulation areas.
[0057] The bus bar encapsulation areas sequentially adhesively fixed from top to bottom include the front plate 2, the first encapsulation film 3, the perforated barrier insulating film 5, the second encapsulation film 6, and the back plate.
[0058] Perforations communicating with each other are provided at the positions corresponding to the perforated barrier insulating film 5, the second encapsulation film 6, and the back plate up and down.
[0059] The bus bar encapsulation area further includes an L-shaped conductive metal substrate 4.
[0060] The L-shaped conductive metal substrate 4 includes a horizontal section and a vertical section. The horizontal section is located between the first encapsulation film 3 and the perforated barrier insulating film 5, and the vertical section sequentially passes through the perforations at the corresponding positions of the perforated barrier insulating film 5, the second encapsulation film 6, and the back plate.
[0061] The L-shaped conductive metal substrate 4 forms an electrical connection with the solar cell 9, collects the current collected by the solar cell 9 and conducts it to an external circuit.
[0062] The bus bar lead-out wire is connected to the L-shaped conductive metal substrate 4, collects the current collected by the solar cell 9 and conducts it into the junction box 11.
[0063] In a specific embodiment, the material of the perforated barrier insulating film 5 is transparent butyl rubber.
[0064] In a specific embodiment, the thickness of the perforated barrier insulating film 5 is 0.3 - 0.7 mm.
[0065] In a specific embodiment, the material of the front plate 2 is transparent glass material.
[0066] In a specific embodiment, the material of the back plate is a single-glass or double-glass structure.
[0067] In a specific embodiment, a photovoltaic module as described above
[0068] The thickness of the front plate 2 is 1.6 - 3.2 mm,
[0069] The grammage of the first encapsulation film 3 is 400 - 450 g / m 2 ,
[0070] The grammage of the second encapsulation film 6 is 400 - 450 g / m 2 ,
[0071] The thickness of the back plate is 0.1 - 3.2 mm.
[0072] Taking the ideal embodiments of the present utility model as the above inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A photovoltaic module, characterized in that: The invention is a layered structure, comprising a battery cell (9) packaging structure, a combination frame (10), a battery cell (9) connection circuit and a plurality of busbars (1). The busbar (1) is used to collect the current collected by the battery cells (9) and conduct it to the junction box (11). The battery cell (9) packaging structure is horizontally fixed in the concave portion of the assembly frame (10) disposed parallel to each other on the left and right sides. The battery cell (9) packaging structure comprises a battery cell (9), The battery cell (9) is located between the first packaging film (3) and the second packaging film (6), and the upper and lower surfaces of the battery cell (9) are respectively bonded and fixed to the first packaging film (3) and the second packaging film (6) to form a pre-packaging structure of the battery cell (9). Edge barrier films are provided on both sides of the battery cell (9) pre-packaged structure, and the edge barrier films are bonded and fixed to the adjacent end faces of the battery cell (9) pre-packaged structure. The distance from the upper surface of the first packaging film (3) to the lower surface of the second packaging film (6) is equal to the thickness of the edge barrier film. The battery cell (9) packaging structure also includes a front plate (2) and a back plate. The upper surface and the lower surface of the pre-packaged structure of the battery cell (9) are respectively bonded and fixed to the front plate (2) and the back plate. The edges of the front plate (2) and the back plate are bonded and fixed together with the end faces adjacent to the edge barrier film. The first packaging film (3) and the front plate (2) are both made of transparent materials.
2. A photovoltaic module according to claim 1, characterized in that: The width of the edge barrier film is not less than 15 mm.
3. A photovoltaic module according to claim 1, characterized in that: The edge barrier film is made of transparent butyl rubber.
4. A photovoltaic module according to claim 1, characterized in that: The busbar strip (1) comprises a busbar lead-out line, a junction box (11) and a plurality of busbar packaging areas. The busbar packaging area comprises a front plate (2), a first packaging adhesive film (3), an open hole barrier insulating adhesive film (5), a second packaging adhesive film (6), and a back plate which are bonded and fixed in sequence from top to bottom. The second packaging adhesive film (6), the perforated blocking insulating adhesive film (5), and the back plate are provided with mutually connected openings at corresponding positions above and below. The busbar packaging area also includes an L-shaped conductive metal substrate (4), The conductive metal matrix comprises a horizontal section and a vertical section, wherein the horizontal section is located between the first packaging film (3) and the perforated barrier insulating film (5), and the vertical section sequentially passes through the perforated barrier insulating film (5), the second packaging film (6), and the opening at the corresponding position of the back plate. The conductive metal substrate forms a conductive connection with the battery cell (9), collects the current collected by the battery cell (9) and conducts it to an external circuit. The current collecting lead is connected to the conductive metal substrate, collects the current collected by the battery sheet (9) and leads it to the junction box (11).
5. A photovoltaic module according to claim 4, characterized in that: The material of the perforated barrier insulating adhesive film (5) is transparent butyl rubber.
6. A photovoltaic module according to claim 4, characterized in that: The thickness of the perforated barrier insulating adhesive film (5) is 0.3-0.7 mm.
7. A photovoltaic module according to any one of claims 1 or 4, characterized in that: The front plate (2) is made of transparent glass.
8. A photovoltaic module according to any one of claims 1 or 4, characterized in that: The back panel is a single-glass or double-glass structure.
9. A photovoltaic module according to any one of claims 1 or 4, characterized in that: The thickness of the front plate (2) is 1.6-3.2 mm, The first packaging film (3) has a gram weight of 400-450 g / m 2 , The second packaging film (6) has a grammage of 400-450 g / m 2 .