CN102254976B - Double-sided solar cell component - Google Patents

Abstract

The invention provides a solar cell bifacial assembly, which includes a crystalline silicon solar cell assembly, the crystalline silicon solar cell assembly includes a cover glass, a plurality of crystalline silicon solar cell sheets and a back plate, and the plurality of crystalline silicon solar cell The sheet is encapsulated by EVA hot-melt adhesive and fixedly bonded to the cover glass and the back plate respectively through the EVA hot-melt adhesive, and the back plate is a thin-film solar cell module. The solar cell bifacial module of the invention has high energy utilization rate and good economic utilization value.

Description

A kind of solar cell bifacial module

【Technical field】

The invention relates to the field of solar cells, in particular to the structure of solar cell modules.

【Background technique】

3与盖板玻璃1和背板4进行粘结固定，形成晶体硅太阳能电池组件。对于薄膜太阳能电池组件，通常是在衬底上沉积PN结构或者P-i-N结构作为非晶硅太阳能电池层，衬底一般采用价格低廉的玻璃，非晶硅太阳能电池层通过层压薄膜封装并与背板固定，背板一般采用EVA或TPT。EVA作为热熔胶，是乙烯—乙酸乙烯（醋酸乙烯）酯共聚物，它是由乙烯（E）和乙酸乙烯（VA）共聚而制得，简称为EVA。一般乙酸乙烯（VA）含量在5%～40%。与聚乙烯相比，EVA由于在分子链中引入了乙酸乙烯单体，从而降低了结晶度，提高了柔韧性、抗冲击性、填料相溶性和热密封性能。At present, industrialized solar cells mainly include crystalline silicon solar cells and thin-film solar cells. For practical applications, they need to be packaged into modules first. The main function of modules is to protect solar cells and ensure their service life. The structural diagram of the crystalline silicon solar cell module is shown in Figure 1. Cover glass 1, laminated film 2, solar cell 3, laminated film 2, and back sheet 4 are arranged in sequence along the incident direction of sunlight, and the solar cell 3 passes through The lamination film 2 is packaged, and the solar cells are sealed by the lamination film 2

3 Bonding and fixing the cover glass 1 and the back plate 4 to form a crystalline silicon solar cell module. For thin-film solar cell components, PN structure or PiN structure is usually deposited on the substrate as the amorphous silicon solar cell layer. Fixed, the backplane generally adopts EVA or TPT. EVA, as a hot melt adhesive, is an ethylene-vinyl acetate (vinyl acetate) copolymer, which is obtained by copolymerizing ethylene (E) and vinyl acetate (VA), and is referred to as EVA. Generally, the content of vinyl acetate (VA) is 5% to 40%. Compared with polyethylene, EVA has reduced crystallinity and improved flexibility, impact resistance, filler compatibility and heat sealing performance due to the introduction of vinyl acetate monomer in the molecular chain.

Both crystalline silicon solar cells and thin-film solar cells are usually packaged in a single-sided module without utilizing the back side of the module.

【Content of invention】

The technical problem to be solved by the present invention is to provide a double-sided solar cell assembly with higher efficiency in order to make full use of the diffusely reflected light on the back of the solar cell assembly.

The technical solution adopted by the present invention to achieve the purpose of the invention is that a solar cell double-sided assembly includes a crystalline silicon solar cell assembly, and the crystalline silicon solar cell assembly includes a cover glass, a plurality of crystalline silicon solar cell sheets and a back plate, so that The plurality of crystalline silicon solar cells are encapsulated by EVA hot-melt adhesive and fixedly bonded to the cover glass and the back plate respectively by EVA hot-melt adhesive. The back plate is a thin-film solar cell module, and the thin-film solar cell Glass and amorphous silicon solar cell layer, the conductive glass is composed of a glass substrate and a conductive film layer, the conductive film layer is located between the amorphous silicon solar cell layer and the glass substrate, the non-crystalline silicon solar cell layer The crystalline silicon solar cell layer is composed of an amorphous silicon thin film layer and an aluminum film layer, the amorphous silicon thin film layer is located between the conductive film layer and the aluminum film layer, and the aluminum film layer is thermally fused with the EVA The aluminum film layer is electrically connected to the conductive film layer, and a positive electrode and a negative electrode are formed on the aluminum film layer.

More preferably, the conductive film layer is tin dioxide transparent conductive film.

More preferably, the conductive film layer is a zinc oxide transparent conductive film.

More preferably, the conductive film layer is composed of a plurality of mutually isolated conductive films, the aluminum film layer is also composed of a plurality of mutually isolated aluminum films, and the conductive film is electrically connected to the aluminum film.

More preferably, the amorphous silicon thin film layer has a P-i-N structure.

More preferably, it also includes a fixed frame, and the fixed frame is fixedly connected with the periphery of the cover glass and the conductive glass.

Preferably, the fixed frame is an aluminum alloy frame.

By using the solar cell bifacial assembly according to the present invention, by replacing the back plate of the existing crystalline silicon solar cell with a thin film solar cell, the diffuse reflected light on the back of the cell is fully utilized, and the energy utilization rate of the solar cell is improved.

【Description of drawings】

Figure 1, the structural diagram of the existing crystalline silicon solar cell module.

Fig. 2 is a structural diagram of the solar cell bifacial module in Embodiment 1.

Fig. 3 is a structural diagram of a thin-film solar cell assembly in Example 2.

【Detailed ways】

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Example 1

This embodiment provides a solar cell double-sided module, its structural diagram is referred to accompanying drawing 2, comprises cover glass 1, EVA hot-melt adhesive 2, crystalline silicon solar cell piece 3, interconnection bar 5, conductive glass 6, amorphous Silicon solar cell layer 7, a plurality of crystalline silicon solar cell sheets 3 are electrically connected to each other through interconnection strips 5 to form a cell layer, EVA hot melt adhesive 2 seals the cell layer, and the amorphous silicon solar cell layer 7 is arranged on the EVA heat Between the melt glue 2 and the conductive glass 6 , the EVA hot melt glue 2 is bonded to the cover glass 1 and the amorphous silicon solar cell layer 7 respectively, and the conductive glass 6 and the amorphous silicon solar cell layer 7 form a thin-film solar cell module.

The working principle of this embodiment is that on the front of the battery, sunlight is incident from the cover glass 1, passes through the laminated film 2 and reaches the crystalline silicon solar cell 3, and the crystalline silicon solar cell 3 converts light energy into electric current, and passes through the interconnection The strip 5 gathers the current of multiple crystalline silicon solar cells 3 and outputs them through the output electrodes; at the same time, the light generated by diffuse reflection in the surrounding environment is incident on the thin film solar cells on the back of the cells, and the amorphous silicon solar cell layer 7 is made of conductive glass 6 Form a thin-film solar cell module for the substrate and convert the light generated by diffuse reflection into electric current, realize the conversion of diffuse reflection light into electrical energy and output it through the output electrode.

Through this embodiment, the light energy utilization rate of the solar cell can be significantly improved only by simple processing in the process. Since the cost of the thin-film solar cell assembly itself is very low, the double-sided solar cell assembly of this embodiment will It has good economic value.

Example 2

This embodiment provides a solar cell double-sided module, its structural diagram is referred to accompanying drawing 2, comprises cover glass 1, EVA hot-melt adhesive 2, crystalline silicon solar cell piece 3, interconnection bar 5, conductive glass 6, amorphous Silicon solar cell layer 7, a plurality of crystalline silicon solar cell sheets 3 are electrically connected to each other through interconnection strips 5 to form a cell layer, EVA hot melt adhesive 2 seals the cell layer, and the amorphous silicon solar cell layer 7 is arranged on the EVA heat Between the melt glue 2 and the conductive glass 6 , the EVA hot melt glue 2 is bonded to the cover glass 1 and the amorphous silicon solar cell layer 7 respectively, and the conductive glass 6 and the amorphous silicon solar cell layer 7 form a thin-film solar cell module. Refer to accompanying drawing 3 for the structural diagram of the thin-film solar cell assembly, which includes a conductive glass 6 composed of a glass substrate 8 and a conductive film layer 9, and an amorphous silicon solar cell layer 7 composed of an amorphous silicon film layer 10 and an aluminum film layer 11 , the aluminum film layer 11 is fixedly bonded with the EVA hot melt adhesive 2, the amorphous silicon film layer 10 is located between the aluminum film layer 11 and the conductive film layer 9, the conductive film layer 9 is fixed on the inner side of the glass substrate 8, and the aluminum film layer 11 is electrically connected to the conductive film layer 9, and the positive electrode 12 and the negative electrode 13 are formed on the aluminum film layer 11, and the positive electrode 12 and the negative electrode 13 form an output electrode. As shown in FIG. 3 , in this embodiment, the conductive film layer 9 is composed of a plurality of mutually isolated conductive films, and the aluminum film layer 11 is also composed of a plurality of mutually isolated aluminum films, and the conductive film and the aluminum film are electrically connected.

The working principle of this embodiment is that on the front of the battery, sunlight is incident from the cover glass 1, passes through the laminated film 2 and reaches the crystalline silicon solar cell 3, and the crystalline silicon solar cell 3 converts light energy into electric current, and passes through the interconnection The strip 5 collects the current of multiple crystalline silicon solar cells 3 to the output electrode; at the same time, the light generated by diffuse reflection in the surrounding environment is incident on the glass substrate 8 on the back of the cell, and passes through the conductive film layer 9 and the amorphous silicon film layer in turn. 10. The amorphous silicon thin film layer 10 converts light into electric current, and the output electrode composed of the positive electrode 12 and the negative electrode 13 is output to the outside.

During specific implementation, the conductive film layer 9 adopts a zinc oxide conductive film, and the amorphous silicon film layer 10 has a P-i-N structure. In order to better fix the entire solar cell double-sided assembly, an aluminum alloy fixing frame is also provided. The aluminum alloy fixing frame and the cover The plate glass 1 is fixedly connected to the periphery of the conductive glass 5 to make the structure of the entire double-sided solar cell module more stable, easy to install and adapt to various outdoor environments.

Through this embodiment, the light energy utilization rate of the solar cell can be significantly improved only by simple processing in the process. Since the cost of the thin-film solar cell assembly itself is very low, the double-sided solar cell assembly of this embodiment will It has good economic value.

Claims (7)

1. A solar cell bifacial assembly, comprising a crystalline silicon solar cell assembly, said crystalline silicon solar cell assembly comprising cover glass, a plurality of crystalline silicon solar cells and a back plate, said plurality of crystalline silicon solar cells consisting of EVA hot-melt adhesive package and fixed bonding with cover glass and back plate respectively by EVA hot-melt adhesive, it is characterized in that: the back plate is a thin-film solar cell module, and the thin-film solar cell module is made of conductive glass and amorphous silicon Solar cell layer, the conductive glass is composed of a glass substrate and a conductive film layer, the conductive film layer is located between the amorphous silicon solar cell layer and the glass substrate, and the amorphous silicon solar cell layer Composed of an amorphous silicon film layer and an aluminum film layer, the amorphous silicon film layer is located between the conductive film layer and the aluminum film layer, the aluminum film layer is fixedly bonded to the EVA hot melt adhesive, The aluminum film layer is electrically connected to the conductive film layer, and a positive electrode and a negative electrode are formed on the aluminum film layer. 2 . The double-sided solar cell module according to claim 1 , wherein the conductive film layer is a tin dioxide transparent conductive film. 3 . 3. The double-sided solar cell module according to claim 1, wherein the conductive film layer is a zinc oxide transparent conductive film. 4. The solar cell double-sided module according to claim 1, characterized in that: the conductive film layer is composed of a plurality of mutually isolated conductive films, and the aluminum film layer is also composed of a plurality of mutually isolated aluminum films, The conductive film is electrically connected to the aluminum film. 5. The solar cell bifacial module according to claim 1, characterized in that: the amorphous silicon thin film layer has a P-i-N structure. 6 . The solar cell bifacial module according to claim 1 , further comprising a fixed frame, the fixed frame is fixedly connected to the periphery of the cover glass and the conductive glass. 7 . 7. The solar cell bifacial module according to claim 6, wherein the fixing frame is an aluminum alloy frame.

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