CN216902965U

CN216902965U - Double-sided double-glass photovoltaic assembly

Info

Publication number: CN216902965U
Application number: CN202123179442.1U
Authority: CN
Inventors: 董超; 严勋; 阚宏俊; 王丽华
Original assignee: Yancheng Tianhe Guoneng Photovoltaic Technology Co ltd
Current assignee: Yancheng Tianhe Guoneng Photovoltaic Technology Co ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-07-05
Anticipated expiration: 2031-12-17

Abstract

The utility model provides a two-sided dual-glass photovoltaic module, includes the lamination piece that adopts the preparation of zone of heating laminating equipment to form, the lamination piece includes from supreme lower glass layer, the transparent encapsulation glued membrane of first layer, the bipartite photovoltaic cell lamella of first layer, the transparent encapsulation glued membrane of second floor, the transparent encapsulation glued membrane of third layer, the bipartite photovoltaic cell lamella of second floor, the transparent encapsulation glued membrane of fourth layer and last glass layer that sets gradually down. 10-12 main grids and a high-density packaging structure are uniformly arranged on each 210mm photovoltaic cell, and the space between the cells is reduced to 0.5 mm. The size of the assembly is further reduced, and the overall efficiency is effectively improved. And the power generation capacity is improved.

Description

Double-sided double-glass photovoltaic assembly

Technical Field

The utility model relates to the technical field of photovoltaic module preparation, in particular to a high-efficiency double-sided double-glass photovoltaic module.

Background

Most of the photovoltaic modules widely used at present are single-sided modules, the single-sided modules adopt single-sided solar cells, the solar cells with the structure can only receive light on the front side, and the back side cannot absorb light, so that the power output of the single-sided cells is relatively limited. Compared with a single solar cell, the double-sided solar cell can absorb light on both the front and back sides, so that the overall power output and conversion efficiency of the cell are greatly improved.

CN201910883616.0 of the present applicant is a sliced photovoltaic module: the battery pack comprises one or more serially connected battery units, wherein each battery unit comprises one or more serially or parallelly connected battery string series, each battery string series comprises one or more battery strings connected in parallel through a bus bar, and each battery string comprises a plurality of sliced batteries connected in series through interconnection bars; wherein: the sliced cell is a conventional solar cell slice which is cut into 2-4 independent small cells with the same specification by laser, each small cell slice is provided with a positive electrode and a back electrode, and the positions of the positive electrode and the back electrode are mutually overlapped; the sliced batteries are connected in series through the interconnecting strips to form a battery string. The solar cell module can solve the problem of great increase of Voc of the module due to increase of the number of the cells, effectively reduces power loss of the solar cell module and improves hot spot power loss of the solar cell module.

CN2017209324823 discloses a sliced double-sided double-glass photovoltaic module, which comprises rolled toughened glass, a first transparent packaging adhesive film, a sliced double-sided battery string, a second transparent packaging adhesive film and rolled glass, which are sequentially arranged from top to bottom; the sliced double-sided battery string is formed by connecting a plurality of sliced battery slices by a welding strip, and a light-reflecting adhesive film is adhered to the surface of the welding strip; and a junction box is arranged on the back of the assembly. However, the existing double-sided photovoltaic module still has a plurality of problems in the actual work: 1) the double-sided photovoltaic cell piece receives much solar radiation on the front side, receives little solar radiation on the back side, is restricted by the structure and the working principle of the traditional double-sided photovoltaic cell piece, and can generate lower photoelectric conversion efficiency caused by insufficient light receiving. 2) The double-sided photovoltaic cell has the problem of higher cost caused by complex process in the manufacturing process.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model aims to provide a double-sided double-glass photovoltaic module with large-size cells and multiple main grids. Higher conversion efficiency and cost savings (higher power per unit area). In particular to a two-piece double-sided double-glass photovoltaic module prepared by using a 210mm silicon chip based on a 12 inch silicon rod.

In order to achieve the purpose, the utility model adopts the following technical scheme: the utility model provides a double-sided double-glass photovoltaic module, includes the lamination piece that adopts the preparation of zone of heating laminating equipment to form, the lamination piece includes from supreme lower glass layer, the transparent encapsulation glued membrane of first layer, the two bipartite photovoltaic cell lamella of first layer, the transparent encapsulation glued membrane of second floor, printing opacity insulating layer, the transparent encapsulation glued membrane of third layer, the two bipartite photovoltaic cell lamella of second floor, the transparent encapsulation glued membrane of fourth layer and last glass layer that sets gradually down.

The bipartite photovoltaic cell is a cell substrate with a specification of 210mm cut by a silicon wafer. A cell substrate fabrication process such as a PERC process or a heterojunction structure.

The total width of the two photovoltaic cell slices is 5 photovoltaic cell slices with the width of 210mm, 10-12 main grids (vertical electrode grids) are uniformly arranged on each photovoltaic cell slice with the width of 210mm, and the width of each main grid is 1.2-2.0 mm. A transparent insulating layer, such as PMMA, PET, etc., is arranged between the second layer of transparent packaging film and the third layer of transparent packaging film.

The high-density packaging structure of the utility model: the flattening process of the local part of the welding strip (the connecting area between the battery pieces) reduces the space between the battery pieces to 0.5mm, further reduces the size of the assembly and effectively improves the overall efficiency.

The number of single strings of cells (increased number of cell slices) increased from 24 to 30: in order to reduce hot spot failure, one or two slices can reduce the current and reduce the risk of mismatch of the battery; and (4) assembling the components after electrical property plus screening.

Compared with the traditional 158mm battery, the efficiency of the 210mm battery is improved by about 75 percent, and the output current of the component is mainly determined by the area of a single battery; the power of the two-piece and multi-main grid is large, the 210mm component is excited perfectly, the potential energy is higher, and the existing main photovoltaic system is in seamless joint.

Has the advantages that: compared with the traditional 158mm battery, the efficiency of the 210mm battery is improved by about 75 percent, and the output current of the component is mainly determined by the area of a single battery; and (5) power simulation of the three-segment + multi-main grid. Three-segment + multi-main grid perfectly excites 210 components, has higher potential and higher power, and is seamlessly butted with the existing main stream photovoltaic system

Once released, 210mm silicon wafers have become a topic of industry initiative. Compared with the traditional 158mm battery, the area of the whole 210mm battery is increased by about 75%, the output current of the module is mainly determined by the area of the minimum battery unit and the module, the utility model has a bipartite design, the current is increased to 18A, and the open-circuit voltage of the module is determined by the number of battery pieces and the type; the open circuit voltage of the component of the application is 37-51 volts, which is within the acceptable range of the user and the distributed project, and is lower than the voltage of the existing 158, 166 and 182mm component components, so that the component can increase the length of the group string and further reduce the cost of the system.

The industry consistently considers that the silicon chip size is increased, and the component power can be greatly improved. Taking the conventional 72-piece half-piece module packaged by 158 battery pieces as an example, the power of the module is generally 410 watts, while the 166 battery pieces and the 210 battery piece of the utility model can respectively reach 445 watts and 500 watts at the module end. Higher power components may result in lower component and system costs, which in turn reduces power costs.

The double-sided double-glass photovoltaic module is synthesized by two groups of single-sided battery pieces, and aiming at the conditions that the front side module is subjected to more solar radiation and the back side module is subjected to less solar radiation, the problem that the back side module is low in photoelectric conversion efficiency due to insufficient light is effectively solved, the cost is reduced, and the generating capacity is improved.

Drawings

Fig. 1 is a structural diagram of a double-sided double-glass photovoltaic module provided by the utility model.

Detailed Description

Description of reference numerals, 1: lower glass layer, 2: first layer of transparent packaging adhesive film, 3: first-layer second-sliced photovoltaic cell sheet, 4: second layer transparent packaging adhesive film, 5: light-transmitting insulating layer, 6: third layer transparent packaging adhesive film, 7: second sliced photovoltaic cell sheet, 8: fourth layer of transparent packaging adhesive film, 9: and (4) coating a glass layer. In the figure 4: second layer transparent packaging adhesive film, 5: light-transmitting insulating layer, 6: the third layer of transparent packaging adhesive film is drawn into a layer.

The upper glass layer and the lower glass layer are made of low-iron super-white suede toughened glass, so that the bearing resistance, the water resistance and the fire resistance of the double-sided double-glass photovoltaic module are effectively improved, and the application occasions of the double-sided double-glass photovoltaic module are increased; the reflection and the scattering of light are reduced, and the generating capacity is improved. The acrylic plate PMMA or PE is used as the insulating layer 5 of the two-slice photovoltaic cell slices, so that the problem of short circuit between the front assembly and the back assembly in the laminating process is effectively solved; but also does not block incident light from penetrating the assembly and increases the solar radiation on the back; the aesthetic appearance of the overall assembly is improved. The transparent packaging adhesive film adopts the EVA packaging adhesive film, so that more photons can reach the surface of the cell, the power generation efficiency is improved, and the PID resistance is improved.

Wherein the upper glass layer 9 and the lower glass layer 1 are both low-iron super-white suede toughened glass; the smooth surface of the low-iron ultra-white suede toughened glass positioned on the lower glass layer 1 faces downwards, and the suede surface faces upwards; the iron super white suede toughened glass on the upper glass layer 9 has a suede surface facing downwards and a smooth surface facing upwards. The iron content of the iron super-white suede toughened glass is low, the iron content is white when viewed from the side, the transmittance of light is increased, the reflection of light can be reduced by the suede, the intensity is high, the internal tension is high, and the iron super-white suede toughened glass cannot scatter after being broken; so that more incident light is absorbed by the first two-slice photovoltaic cell sheet layer and the second two-slice photovoltaic cell sheet layer, and reflection and scattering are reduced.

The first transparent packaging adhesive film 2, the second transparent packaging adhesive film 4, the third transparent packaging adhesive film 6 and the fourth transparent packaging adhesive film 8 are preferably EVA adhesive films, and epoxy resin adhesive films or highly transparent copolymerized olefin adhesive films can also be used. The EVA is ethylene-vinyl acetate copolymer; the EVA adhesive film has a wide temperature range, and has the characteristics of good flexibility, impact strength resistance, environmental stress cracking resistance, good optical performance, low temperature resistance and no toxicity.

The light-transmitting insulating layer 5 is an acrylic plate, a PET (polyethylene terephthalate) or a PC (polycarbonate) plate.

The first two-slice photovoltaic cell slice layer 3 and the second two-slice photovoltaic cell slice layer 7 are crystalline silicon cells, PERC cells or laminated tile assemblies.

Preferably, the crystalline silicon cell is a monocrystalline silicon cell or a polycrystalline silicon cell; the monocrystalline silicon photovoltaic module has 16% -19% conversion efficiency, but the manufacturing energy consumption is high, and the price is high; the polycrystalline silicon photovoltaic module has the photoelectric conversion efficiency of 15% -17%, but the manufacturing efficiency is medium and the price is moderate.

The first layer of transparent packaging adhesive film 2 is placed on the upper side of the lower glass layer 1, the smooth surface of the lower glass layer faces downwards, and the suede surface of the lower glass layer faces upwards; the first and second sliced photovoltaic cell sheets are melted during high-temperature lamination, and bonded with the lower glass layer, so that the first and second sliced photovoltaic cell sheets are protected from being influenced by external force; after cooling, the structure is solidified, and can absorb a large amount of ultraviolet light, thereby playing a role in anti-reflection.

The second layer of transparent packaging adhesive film 4 is placed on the upper side of the first two-slice photovoltaic cell layer 3, and the suede surface is downward, and the smooth surface is upward; the first secondary photovoltaic cell layer and the light-transmitting insulating layer are bonded to each other in a melting mode during high-temperature lamination, and the first secondary photovoltaic cell layer is protected from being influenced by external force; after cooling, the structure is solidified; can absorb a large amount of ultraviolet light and increase the transmittance.

The third layer of transparent packaging adhesive film 6 is placed on the upper side of the light-transmitting insulating layer 5, and the smooth surface faces downwards and the suede surface faces upwards; the second sliced photovoltaic cell layer is melted during high-temperature lamination, and the second sliced photovoltaic cell layer and the light-transmitting insulating layer are bonded to protect the second sliced photovoltaic cell layer from being influenced by external force; after cooling, the structure is solidified; can absorb a large amount of ultraviolet light and increase the transmission.

The fourth layer of transparent packaging adhesive film 8 is placed on the upper side of the second sliced photovoltaic cell layer 7, and one surface of a suede surface faces downwards, and the other surface of the smooth surface faces upwards; the second sliced photovoltaic cell layer is melted during high-temperature lamination, and the second sliced photovoltaic cell layer and the upper glass layer are bonded to protect the second sliced photovoltaic cell layer from being influenced by external force; after cooling, the structure is solidified; can absorb a large amount of ultraviolet light and increase the transmission.

The light receiving surface of the first secondary photovoltaic cell sheet layer 3 faces downwards, and the backlight electrode faces upwards; the light-receiving side of the second cell sheet layer 7 faces upward, and the backlight electrode faces downward. The light receiving surface of the first secondary photovoltaic cell sheet layer faces downwards, the backlight electrode faces upwards, and the light receiving surface of the second secondary photovoltaic cell sheet layer faces upwards, and the backlight electrode faces downwards.

The reflecting film with the pyramid structure is adhered to the surface of the battery piece in a welding mode, incident light is reflected to the surface of the battery piece through the surface of the reflecting film, and power output of the assembly is improved. High-density package structure: the flattening process of the local part (the connection area between the battery pieces) of the welding strip reduces the distance of the pieces to 0.5mm, further reduces the size of the assembly and effectively improves the overall efficiency. The number of single string cells (increased number of cell slices) of the assembly increased from 24 to 30: in order to reduce hot spot failure, one of the two or three sheets can reduce the current and reduce the risk of mismatch of the battery; and electrical property screening and assembling into a component.

Claims

1. A double-sided double-glass photovoltaic module is characterized by comprising a laminating piece prepared by heating laminating equipment, wherein the laminating piece comprises a lower glass layer, a first transparent packaging adhesive film layer, a first bipartite photovoltaic cell layer, a second transparent packaging adhesive film layer, a third transparent packaging adhesive film layer, a second bipartite photovoltaic cell layer, a fourth transparent packaging adhesive film layer and an upper glass layer which are sequentially arranged from bottom to top;

The two-slice photovoltaic cell is a cell substrate cut by a silicon wafer with the specification of 210mm, and the two-slice photovoltaic cell layers are 5 photovoltaic cell layers with the width of 210mm in total; 10-12 main grids are uniformly arranged on each 210mm photovoltaic cell substrate, and the width of each main grid is 1.2-2.0 mm.

2. The dual sided dual glass photovoltaic module of claim 1, wherein the high density encapsulation structure: the welding strips at the connecting areas between the battery pieces are in a flattened structure, and the space between the battery pieces is reduced to 0.5 mm.

3. The double-sided dual-glass photovoltaic module as recited in claim 1, wherein a light-transmitting insulating layer is disposed between the second transparent packaging adhesive film and the third transparent packaging adhesive film.