A process for the preparation of a photovoltaic module

Abstract

The application provides a preparation process of a photovoltaic module, and belongs to the technical field of photovoltaic technology; the preparation process of the photovoltaic module avoids the problem of offset of secondary lamination welding strips during the manufacturing of the photovoltaic module by laying a high-temperature-resistant separator on photovoltaic glass, and can effectively improve the reliability of the photovoltaic module.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of photovoltaic technology, and particularly relates to a preparation process of a photovoltaic module. BACKGROUND

[0002] A traditional photovoltaic module preparation method is to first lay a glass adhesive film, then perform cell piece welding and laying, then lay an adhesive film, and finally lay glass or a back plate on the adhesive film and perform lamination. A new photovoltaic module manufacturing process is to lay an adhesive film on the front glass and perform primary lamination at the same time, then embed a solder strip and lay a cell piece, and the back glass or back plate is placed on the adhesive film to embed the solder strip and perform secondary lamination. However, the solder strip is prone to deviation during the lamination process, and the reliability of the module is at risk. However, the new photovoltaic module manufacturing process has problems such as deviation of the solder strip during lamination and inability to meet the reliability of the module. SUMMARY

[0003] In view of the problems in the prior art, the application provides a preparation process of a photovoltaic module. The preparation process of the photovoltaic module avoids the problem of deviation of the solder strip during secondary lamination of the photovoltaic module, and can effectively improve the reliability of the photovoltaic module.

[0004] The application achieves the above technical purpose through the following technical means.

[0005] A preparation process of a photovoltaic module, comprising the following steps:

[0006] S1. Laying an insulator on the photovoltaic glass, then laying a first photovoltaic encapsulant film on the insulator, and performing primary lamination; then embedding at least two bus bars and a plurality of photovoltaic solder strips on the first photovoltaic encapsulant film, the bus bars being perpendicular to the ends of the photovoltaic solder strips; then removing the insulator and laying a second photovoltaic encapsulant film at the position of the insulator;

[0007] S2. Obtaining a photovoltaic front plate and a photovoltaic back plate through step S1, laying a photovoltaic cell piece on the photovoltaic solder strips of the photovoltaic front plate, and then laying a photovoltaic back plate on the photovoltaic cell piece;

[0008] S3. Laminating the photovoltaic front plate, the photovoltaic cell piece, and the photovoltaic back plate to obtain a photovoltaic module.

[0009] Preferably, in step S1, the insulator comprises a non-adhesive high molecular material, such as a polytetrafluoroethylene high-temperature cloth or a heat-debonding high molecular film material.

[0010] Preferably, in step S1, the first photovoltaic encapsulation adhesive film and the second photovoltaic encapsulation adhesive film comprise any one of transparent EVA (ethylene vinyl acetate polymer), white EVA, polyolefin POE (polyolefin), co-extrusion POE, Silicon organic silicon film, PVB (polyvinyl butyral) adhesive film or TPU (polyurethane rubber) adhesive film.

[0011] Preferably, in step S1, the length and width of the first photovoltaic encapsulation adhesive film are smaller than the length and width of the photovoltaic glass.

[0012] Preferably, in step S1, the length and width of the second photovoltaic encapsulation adhesive film are larger than the length and width of the first photovoltaic encapsulation adhesive film and smaller than the length and width of the photovoltaic glass.

[0013] Preferably, in step S1, the number of the bus bars is even, and the number of the bus bars is twice the number of the photovoltaic cell pieces, and each photovoltaic cell piece is placed on the combination of two bus bars and the photovoltaic solder strip perpendicular to the bus bars.

[0014] Preferably, in step S2, the photovoltaic solder strip of the photovoltaic front plate is aligned with the thin grid of the photovoltaic cell piece.

[0015] Preferably, in step S2, the photovoltaic solder strip of the photovoltaic back plate is aligned with the thin grid of the photovoltaic cell piece.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] In the present application, the preparation process of the new photovoltaic module is optimized, and the high-temperature-resistant separator is laid on the photovoltaic glass to effectively avoid the problem that in the prior art, after the encapsulation material is once laminated and pre-crosslinked, the second lamination of the solder strip is prone to deviation after a period of stagnation, and the reliability of the photovoltaic module can be improved.

[0018] In the present application, the circuit components for connecting all the cell pieces in the module are made into prefabricated parts, and the connection between the cell pieces is completed in the lamination process, which simplifies the cell piece welding process and improves the connection process speed between the cell pieces. In the present application, the solder strip and the bus bar are embedded into the pre-laminated and crosslinked adhesive film to form a solder strip carrying film, the carrying film is not bonded together with the glass, but is bonded and encapsulated between the carrying film and the glass through another layer of adhesive film, so that the flowability of the carrying film can be reduced and the hardness can be improved. Therefore, during the second lamination, the solder strip and the bus bar on the carrying film are not prone to displacement with the flow of the film, thereby reducing the deviation of the solder strip on the cell piece. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The present application is a schematic diagram after the first lamination.

[0020] Figure 2A schematic view for embedding photovoltaic ribbons.

[0021] Figure 3 A schematic view for laying photovoltaic cells.

[0022] Figure 4 A schematic view for welding bus bars.

[0023] Reference signs:

[0024] 1-photovoltaic glass; 2-isolator; 3-first photovoltaic encapsulant film; 4-photovoltaic ribbons; 5-photovoltaic cells; 6-bus bars. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments, but the scope of protection of the present application is not limited thereto.

[0026] Example 1

[0027] The preparation process of the photovoltaic module comprises the following steps:

[0028] S1. Laying an isolator 2 on the photovoltaic glass 1, and then laying a first photovoltaic encapsulant film 3 on the isolator 2, and performing first lamination, a schematic view of the first lamination is shown as Figure 1 ; then embedding at least two bus bars 6 and a plurality of photovoltaic ribbons 4 on the first photovoltaic encapsulant film 3 as shown in Figure 2 , the bus bars 6 are perpendicular to the photovoltaic ribbons 4 at both ends, the number of the bus bars 6 is even, which is twice the number of the photovoltaic cells 5, and each photovoltaic cell 5 is placed on the combination of two bus bars 6 and the photovoltaic ribbons 5 perpendicular thereto, then the isolator 2 is removed and a second photovoltaic encapsulant film is laid at the position of the isolator 2.

[0029] In the actual preparation process, the isolator comprises any material capable of preventing the first photovoltaic encapsulant film 3 and the photovoltaic glass 1 from adhering during the first lamination, resisting high temperature, and not adhering to the first photovoltaic encapsulant film 4 at high temperature, and being easily removed, such as a polytetrafluoroethylene high-temperature cloth. The first photovoltaic encapsulant film 4 and the second photovoltaic encapsulant film are materials having light transmission, adhesion, ultraviolet and high temperature resistance, low water permeability, and high resistivity, and specifically include any one of transparent EVA (ethylene vinyl acetate polymer), white EVA, polyolefin POE (polyolefin), co-extruded POE, Silicon organic silicon film, PVB (polyvinyl butyral) film, or TPU (polyurethane rubber) film.

[0030] In addition, the length and width of the first photovoltaic encapsulant film 4 are smaller than the length and width of the photovoltaic glass 1; the length and width of the second photovoltaic encapsulant film are larger than the length and width of the first photovoltaic encapsulant film 4, and smaller than the length and width of the photovoltaic glass 1.

[0031] S2. The photovoltaic front sheet and the photovoltaic back sheet are obtained by the method described in step S1 respectively, and the photovoltaic cells 5 are laid on the photovoltaic ribbons 4 of the photovoltaic front sheet (S2.1) Figure 3 ), and the bus bars 6 are welded at both ends of the photovoltaic ribbons 4 after the laying (S2.2 Figure 4 ), and then the photovoltaic back sheet is laid on the photovoltaic cells 5. During the laying, the photovoltaic ribbons 4 of the photovoltaic front sheet are aligned with the thin grids of the photovoltaic cells 5, and the photovoltaic ribbons 4 of the photovoltaic back sheet are aligned with the thin grids of the photovoltaic cells 5.

[0032] S3. The photovoltaic front sheet, the photovoltaic cells, and the photovoltaic back sheet are laminated to obtain a photovoltaic module. The embodiment is a preferred implementation of the present application, but the present application is not limited to the above implementation, and any obvious improvement, replacement or modification made by those skilled in the art without departing from the essential content of the present application shall fall within the protection scope of the present application.

Claims

1. A process for the preparation of a photovoltaic module, characterized in that, The method comprises the following steps: S1. Laying a spacer (2) on the photovoltaic glass (1), then laying a first photovoltaic encapsulating film (3) on the spacer (2), and performing first lamination; then embedding at least two bus bars (6) and a plurality of photovoltaic welding ribbons (4) on the first photovoltaic encapsulating film (3), the bus bars (6) being perpendicular to the photovoltaic welding ribbons (4) at both ends; then taking out the spacer (2) and laying a second photovoltaic encapsulating film at the position of the spacer (2); The spacer comprises a non-adhesive high molecular material; The non-adhesive high molecular material comprises a polytetrafluoroethylene high-temperature cloth or a heat-debonding high molecular film material; S2. Obtaining a photovoltaic front plate and a photovoltaic back plate through step S1, laying a photovoltaic cell (5) on the photovoltaic welding ribbons (4) of the photovoltaic front plate, and then laying a photovoltaic back plate on the photovoltaic cell (5); S3. Laminating the photovoltaic front plate, the photovoltaic cell (5), and the photovoltaic back plate to obtain a photovoltaic module.

2. The process for the preparation of a photovoltaic module according to claim 1, characterized in that, In step S1, the first photovoltaic encapsulating film and the second photovoltaic encapsulating film comprise any one of transparent EVA, white EVA, polyolefin POE, co-extruded POE, Silicon organic silicon film, PVB film, or TPU film.

3. The process for the preparation of a photovoltaic module according to claim 1, characterized in that, In step S1, the length and width of the first photovoltaic encapsulating film are smaller than the length and width of the photovoltaic glass.

4. The process for the preparation of a photovoltaic module according to claim 1, characterized in that, In step S1, the length and width of the second photovoltaic encapsulating film are larger than the length and width of the first photovoltaic encapsulating film, and smaller than the length and width of the photovoltaic glass.

5. The process for the preparation of a photovoltaic module according to claim 1, characterized in that, In step S1, the number of the bus bars (6) is even, and the number is twice the number of the photovoltaic cells (5), each photovoltaic cell (5) being placed on a combination of two bus bars (6) and photovoltaic welding ribbons (4) perpendicular thereto.

6. The process for the fabrication of a photovoltaic module according to claim 1, characterized in that, In step S2, the photovoltaic welding ribbons of the photovoltaic front plate are aligned with the fine grids of the photovoltaic cells.

7. The process for the preparation of a photovoltaic module according to claim 1, characterized in that, In step S2, the photovoltaic welding ribbons of the photovoltaic back plate are aligned with the fine grids of the photovoltaic cells.

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