CN206947360U - Photovoltaic module - Google Patents

Abstract

The utility model provides a photovoltaic module, which comprises tempered glass, a front-layer encapsulation adhesive film, battery slice strings, a rear-layer encapsulation adhesive film and a back plate arranged sequentially from top to bottom. The battery slice string includes a plurality of battery slices arranged in a row, a welding ribbon for welding the plurality of battery slices in series, and a bus bar connected with the welding ribbon. The photovoltaic module is also provided with an isolation layer for photovoltaic modules located between the cell string and the rear encapsulation film. The photovoltaic module uses an isolation layer to respectively fix the bus bars, the solder strips and the battery sheets and isolate them from each other. The isolation layer for the photovoltaic module includes at least one polyolefin elastomer layer and at least one modified PET layer sequentially arranged from top to bottom. The isolation layer for the photovoltaic module can be well bonded to the bus bar and the battery sheet, and plays the role of insulation and positioning between the bus bar, the welding strip, and the battery sheet, and realizes the insulation and isolation of the positive and negative electrodes of the battery sheet.

Description

Photovoltaic modules

technical field

The utility model relates to the photovoltaic field, in particular to a photovoltaic assembly provided with an isolation layer for the photovoltaic assembly.

Background technique

At present, there are two main types of insulating materials used in photovoltaic modules: one is the structure of EVA film/PET/EVA film (EPE); the other is the backsheet material for photovoltaic modules, and the common ones are PET/PET/ EVA film (PPE), fluorine film/PET/EVA film (KPE), fluorine film/PET/fluorine film (KPF), fluorine coating/PET/fluorine coating (CPC) and other structures.

Although the EPE structure can improve the light transmittance of sunlight, there is a vinyl acetate segment in the EVA molecular chain in the EPE structure, which is prone to photothermal aging after long-term use, causing EVA to degrade to produce acetic acid and yellowing and delamination. affect the long-term service life of the component. In addition, the EVA layer in the EPE structure and the PET itself are not structurally bonded, and the interlayer force is weak after lamination. Therefore, delamination of the EVA layer and the PET layer may occur during the aging process, which will eventually lead to the risk of bulging failure of the photovoltaic module.

There are the following problems in the use of backplane materials: firstly, the cost of the backplane is high, and secondly, the backplane is relatively thick, which will form a more obvious thickness difference in the module, affecting the appearance and reliability; moreover, due to PPE, KPE, KPF, CPC The bonding performance of several structural materials is not good. Therefore, when using the backsheet material as an insulating material, it is necessary to increase the process of laying an isolation EVA film, that is, an additional layer of EVA film is used to bond the isolation material, battery, etc. Chips and bus bars increase the cost of component manufacturing.

In view of this, it is necessary to design an improved photovoltaic module to solve the above problems.

Utility model content

The purpose of this utility model is to provide a product with no aging and delamination itself, and can be well bonded with the bus bar and the battery sheet, and play the role of insulation and positioning between the bus bar, the welding strip, and the battery sheet Photovoltaic modules with isolation layers.

In order to achieve the purpose of the above utility model, the utility model provides a photovoltaic module, including tempered glass, front packaging adhesive film, cell strings, rear packaging adhesive film and back plate arranged sequentially from top to bottom, the battery The cell string includes a plurality of cells placed in a row, a ribbon for welding the plurality of cell strings in series, and a bus bar connected to the strap, and the photovoltaic module is also provided with a The isolation layer for the photovoltaic module between the encapsulation films of the rear layer, the isolation layer for the photovoltaic module fixes the bus bar, the welding strip and the battery sheet respectively and isolates them from each other, the photovoltaic module uses the isolation layer The isolation layer includes at least one polyolefin elastomer layer and at least one modified PET layer arranged sequentially from top to bottom.

As a further improvement of the present utility model, the isolation layer for the photovoltaic module has a three-layer structure, including two layers of the polyolefin elastomer layer arranged up and down and a layer of the polyolefin elastomer layer between the two layers of the polyolefin elastomer layer. Described modified PET layer.

As a further improvement of the utility model, the thickness of the polyolefin elastomer layer is in the range of 50-200um.

As a further improvement of the utility model, the thickness range of the modified PET layer is 100-200um.

As a further improvement of the present invention, the polyolefin elastomer layer is compounded with the modified PET layer by means of extruder casting or flow coating.

As a further improvement of the utility model, the isolation layer for the photovoltaic module is transparent or white or black.

As a further improvement of the present invention, the photovoltaic module is provided with a plurality of bus bars, and an isolation layer for the photovoltaic module is provided between two bus bars arranged adjacently from top to bottom.

As a further improvement of the utility model, the photovoltaic module is also provided with a bus bar lead-out line connected to the bus bar, and the photovoltaic module uses an isolation layer to connect the bus bar lead-out line and the cell string to each other. isolation.

The beneficial effect of the utility model is: the isolation layer for the photovoltaic component used in the photovoltaic component of the utility model adopts polyolefin elastomer with excellent electrical insulation performance, aging resistance and chemical medium resistance and anti-ultraviolet aging, resistance Compounded with modified PET with damp heat aging and hydrolysis resistance, the obtained isolation layer for photovoltaic modules can be directly thermally pressed with the encapsulation film, which has strong adhesion, stability and good electrical insulation, and plays a role in confluence The insulation and positioning function between the strips, ribbons, and cells realizes the insulation and isolation of the positive and negative electrodes of the cells; the photovoltaic module using the isolation layer for photovoltaic modules improves the delamination problem of photovoltaic modules and solves the problem of backplane materials. Risks and manufacturing costs caused by excessive thickness.

Description of drawings

FIG. 1 is a schematic structural view of Embodiment 1 of an isolation layer for a photovoltaic module in a photovoltaic module of the present invention.

Fig. 2 is a schematic structural diagram of Embodiment 2 of the isolation layer for the photovoltaic module in the photovoltaic module of the present invention.

Fig. 3 is a schematic cross-sectional view of the cells in the photovoltaic module of the present invention.

Fig. 4 is a schematic cross-sectional view of the bus bar in the photovoltaic module of the present invention.

reference sign

10-isolation layer for photovoltaic modules; 1-polyolefin elastomer layer; 2-modified PET layer; 100-photovoltaic module; 20-tempered glass; 31-front packaging film; 32-back packaging film; 40 -welding strip; 50-battery sheet; 61-bus bar lead-out line; 62-bus bar; 70-back plate.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to FIG. 3 to FIG. 4, a photovoltaic module 100, including tempered glass 20, front packaging adhesive film 31, cell strings 50, rear packaging adhesive film 32 and back plate stacked sequentially from top to bottom 70. The photovoltaic module 100 is further provided with an isolation layer 10 between the cell string 50 and the rear encapsulation film 32 .

Please refer to FIG. 1 to FIG. 2 , an isolation layer 10 for a photovoltaic module includes at least one layer of polyolefin elastomer layer 1 and at least one layer of modified PET layer 2 sequentially arranged from top to bottom.

Please refer to Embodiment 1 of the isolation layer 10 for photovoltaic modules shown in Figure 1, the isolation layer 10 for photovoltaic modules has a two-layer structure, and the isolation layer 10 for photovoltaic modules includes a Layer the polyolefin elastomer layer 1 and the modified PET layer 2 on one side of the polyolefin elastomer layer 1 .

Please refer to the second embodiment of the isolation layer 10 for photovoltaic modules shown in Figure 2, the isolation layer 10 for photovoltaic modules has a three-layer structure, and the isolation layer 10 for photovoltaic modules includes two layers of the poly An olefin elastomer layer 1 and a layer of the modified PET layer 2 located between the two layers of the polyolefin elastomer layer 1 .

In the present invention, the polyolefin elastomer layer 1 has a thickness in the range of 50-200um.

In the present utility model, the main components of the polyolefin elastomer layer (POE layer) 1 are silane-grafted POE resin and a small amount of modification assistant. Wherein, the POE resin is a polyolefin elastomer, which is a copolymer of ethylene and butene or octene, that is, the polyolefin elastomer is a copolymer of ethylene and butene or octene. The preparation method of the silane-grafted POE resin is to uniformly mix the POE resin with a silane coupling agent and a cross-linking agent, knead and granulate in an extruder to obtain a silane-grafted POE resin. Wherein, the modified auxiliary agent refers to a blend of crosslinking agent, crosslinking auxiliary agent, anti-aging agent, ultraviolet absorber and the like.

Since the POE resin is a copolymer of ethylene and butene or octene, the molecular chain is a saturated carbon-carbon bond, and the structure is very stable. Therefore, the polyolefin elastomer layer 1 has excellent properties such as aging resistance and chemical medium resistance.

In the present invention, the thickness range of the modified PET layer 2 is 100-200um.

In the present invention, the modified PET layer 2 is prepared by melting and blending the polyester resin (PET) and the modifying agent. Wherein, the polyester resin is one of the following or a copolymer of two or more thereof: polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate. The modifying agent is polycarbodiimide, polyglycol with terminal functional groups, and an auxiliary agent blend, wherein the auxiliary agent blend is one of heat stabilizer, antioxidant, and ultraviolet absorber one or more species. Unmodified PET is prone to hydrolytic degradation of polyester chains under high temperature and high humidity, which reduces its physical properties. Modified PET has properties such as anti-ultraviolet aging resistance, humidity and heat aging resistance, and hydrolysis resistance.

In actual production, according to the performance requirements of modified PET, modifiers with corresponding properties can be selected to obtain modified PET with corresponding excellent properties.

The preparation method of the insulating layer 10 for the photovoltaic module is as follows: firstly prepare the POE resin grafted with silane, then uniformly mix the POE resin with the modification auxiliary agent, and then cast (or spray) through an extruder coating) to at least one side of the modified PET layer, thereby obtaining the isolation layer 10 for the photovoltaic module. The isolation layer 10 for photovoltaic modules has excellent stability, electrical insulation and aging resistance.

In the present invention, the isolation layer 10 for photovoltaic modules is transparent or white or black.

In the present invention, the materials of the front packaging adhesive film 31 and the rear packaging adhesive film 32 are both EVA adhesive films or polyolefin elastomer adhesive films.

The battery slice string 50 includes a plurality of battery slices placed in a row, each of the battery slices is provided with a welding ribbon 40 on the front and back sides of the battery slices to weld the battery slices in series, and the left and right sides of the battery slice string 50 are A plurality of bus bars 62 connecting the welding ribbons 40 are arranged on the side, and bus bar lead-out wires 61 connected with the bus bars 62 are arranged on the bus bars 62 .

Please refer to FIG. 3 to FIG. 4 , at the cells of the photovoltaic module 100 , the photovoltaic The component uses an isolation layer 10 . At the bus bar 62 of the photovoltaic module 100 , a plurality of the bus bars 62 are arranged up and down, and the isolation layer 10 for the photovoltaic module is provided between the adjacently arranged bus bars 62 . In this way, during the lamination process of photovoltaic modules, the isolation layer 10 for photovoltaic modules laminated at high temperature can be directly thermally bonded with the polyolefin elastomer adhesive film or EVA adhesive film, that is, it can be directly bonded with the encapsulation adhesive film. Thermal compression bonding, and has excellent bonding performance and electrical insulation performance. The isolation layer 10 for the photovoltaic module is melted and flowed and then cooled and formed to serve as a connection between the bus bar lead-out wire 61 and the solder ribbon 40, and multiple The insulation and fixing function between the bus bars 62 realizes the insulation and isolation of the positive and negative electrodes of the battery sheet.

To sum up, the isolation layer 10 for the photovoltaic module used in the photovoltaic module 100 of the present utility model adopts the polyolefin elastomer with excellent electrical insulation performance, aging resistance and chemical medium resistance and has anti-ultraviolet aging and anti-aging properties. The modified PET with moisture-heat aging and hydrolysis resistance properties is compounded to obtain the isolation layer 10 for photovoltaic modules. The isolation layer 10 for the photovoltaic module can be directly thermocompressed with the encapsulation film 30 , has strong adhesive force, stability and good electrical insulation, and plays the role of the bus bar 62 and the welding ribbon. 40 and the insulation and positioning function between the battery sheets realize the insulation and isolation of the positive and negative electrodes of the battery sheet; the photovoltaic module 100 using the isolation layer 10 for photovoltaic modules improves the problem of delamination of photovoltaic modules and solves the problem of backplane material Risks and manufacturing costs caused by excessive thickness.

The above embodiments are only used to illustrate the technical solution of the utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solution of the utility model can be modified or Equivalent replacement without departing from the spirit and scope of the technical solution of the present utility model.

Claims (8)

1. A photovoltaic module, comprising tempered glass, front-layer encapsulating adhesive film, cell string, rear-layer encapsulating adhesive film, and back plate arranged in sequence from top to bottom, and the cell string includes a plurality of batteries placed in rows sheet, a welding strip for welding the plurality of battery pieces in series, and a bus bar connected to the welding strip, it is characterized in that: the photovoltaic module is also provided with The photovoltaic module uses an isolation layer, and the photovoltaic module uses an isolation layer to respectively fix the bus bar, the welding ribbon and the battery sheet and isolate them from each other. The photovoltaic module uses an isolation layer including a top-down At least one layer of polyolefin elastomer layer and at least one layer of modified PET layer arranged in sequence. 2. The photovoltaic module according to claim 1, characterized in that: the isolation layer for the photovoltaic module is a three-layer structure, including two layers of the polyolefin elastomer layer arranged up and down and the polyolefin elastomer layer located on the two layers. One layer of the modified PET layer between the body layers. 3. The photovoltaic module according to claim 1, characterized in that: the polyolefin elastomer layer has a thickness in the range of 50-200um. 4. The photovoltaic module according to claim 1, characterized in that: the thickness of the modified PET layer is in the range of 100-200um. 5 . The photovoltaic module according to claim 1 , characterized in that: the polyolefin elastomer layer is compounded with the modified PET layer through extruder casting or flow coating. 6 . 6. The photovoltaic module according to claim 1, characterized in that: the isolation layer for photovoltaic modules is transparent or white or black. 7. The photovoltaic module according to claim 1, characterized in that: said photovoltaic module is provided with a plurality of said bus bars, and said photovoltaic Isolation layer for components. 8. The photovoltaic module according to claim 7, characterized in that: the photovoltaic module is also provided with a bus bar lead-out wire connected to the bus bar, and the photovoltaic module uses an isolation layer to connect the bus bar lead-out wire to the The cell strings are isolated from each other.