Heterojunction photovoltaic module capable of improving output power

Abstract

The utility model relates to the related technical field of photovoltaic devices, and provides a heterojunction photovoltaic assembly capable of improving output power, which comprises a battery panel, and the battery panel comprises front toughened glass, a light conversion film EPE, a plurality of heterojunction half-piece battery strings, anti-ultraviolet EPE and back toughened glass which are sequentially laminated. Reflective films are attached to the positions, corresponding to the gaps between the battery pieces of the heterojunction half-piece battery string, of the back tempered glass. According to the utility model, the utilization of the gap between the packaging adhesive film and the battery piece is optimized, the packaging adhesive film adopts the light conversion film EPE, and the reflective film on the back toughened glass is a functional film capable of changing the light reflection direction, so that the light in the gap of the battery piece is reflected to the surface of the battery piece, the light utilization rate is improved, and the power of the module is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic devices, and specifically, to a heterojunction photovoltaic module for improving output power. Background Art

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] A solar cell can convert light energy into electrical energy. However, the battery cannot be used directly and needs to be encapsulated to ensure its environmental tolerance and certain mechanical properties. This encapsulated device is called a photovoltaic module.

[0004] The inventor found that currently, heterojunction photovoltaic modules usually use two encapsulation adhesive films, ordinary EVA (ethylene-vinyl acetate copolymer) and POE (ethylene-octene copolymer), for encapsulation, and the glass usually selects enameled glass or transparent glass. Such a material-matched encapsulation of heterojunction battery modules cannot fully utilize the weak-light power generation characteristics and high conversion efficiency characteristics of heterojunction batteries, resulting in a low output power of heterojunction photovoltaic modules. Summary of the Utility Model

[0005] To solve the above problems, the utility model provides a heterojunction photovoltaic module for improving output power, which optimizes the utilization of the gap between the encapsulation adhesive film and the battery chip, adopts a light conversion film EPE and gap laminating film, and improves the power of the heterojunction photovoltaic module.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] One or more embodiments provide a heterojunction photovoltaic module for improving output power, including a battery panel, which includes a front tempered glass, a light conversion film EPE, a plurality of heterojunction half-cell strings, an anti-ultraviolet EPE, and a back tempered glass stacked in sequence;

[0008] On the back tempered glass, corresponding to the gap positions between the battery chips of the heterojunction half-cell strings, a reflective film is pasted.

[0009] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0010] The utility model optimizes the utilization of the gap between the encapsulation adhesive film and the battery chip. The encapsulation adhesive film adopts a light conversion film EPE, and the reflective film on the back tempered glass is a functional film that can change the light reflection direction, reflecting the light in the battery chip gap to the surface of the battery chip, improving the light utilization rate, and increasing the power of the module.

[0011] The advantages of the utility model and the advantages of additional aspects will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The attached drawings forming a part of this utility model are used to provide a further understanding of this utility model. The schematic embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute a limitation to this utility model.

[0013] Figure 1 It is a schematic diagram of the battery panel structure of the photovoltaic module of this utility model;

[0014] Figure 2 It is a schematic diagram of light reflection of the gap reflective film of the battery chip of this utility model;

[0015] Figure 3 It is a schematic diagram of the front structure of the photovoltaic module of this utility model;

[0016] Figure 4 It is a schematic diagram of the back structure of the photovoltaic module of this utility model;

[0017] Among them: 1. Front tempered glass, 2. Light conversion film EPE, 3. Multiple heterojunction half-cell strings, 4. Anti-ultraviolet EPE, 5. Back tempered glass, 6. Gap, 7. Reflective film, 8. Grounding hole, 9. Drainage hole, 10. Mounting hole; 3-1. Battery chip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following further describes this utility model in conjunction with the drawings and embodiments.

[0019] It should be noted that the following detailed descriptions are all exemplary and are intended to provide a further description of this utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to this utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] In the technical solutions disclosed in one or more embodiments, as Figures 1 to 4 shown, a heterojunction photovoltaic module for improving output power includes a battery panel, and the battery panel includes a front tempered glass 1, a light conversion film EPE 2, multiple heterojunction half-cell strings 3, an anti-ultraviolet EPE 4, and a back tempered glass 5 that are sequentially stacked;

[0022] On the back tempered glass 5, corresponding to the gap 6 positions between the battery cells 3-1 of the heterojunction half-cell string 3, a reflective film 7 is pasted.

[0023] In this embodiment, the encapsulation adhesive film and the utilization of the gap between the battery cells are optimized. The encapsulation adhesive film uses the light conversion film EPE2, and the reflective film on the back tempered glass 5 is a functional film that can change the light reflection direction, reflecting the light in the battery cell gap to the surface of the battery cell, improving the light utilization rate, and increasing the power of the component.

[0024] Optionally, the front surface of the front tempered glass 1 is coated with a silicon nitride film to increase the light transmittance of the glass.

[0025] In a further technical solution, the light conversion film EPE is a polyethylene film that can convert the solar spectrum into a film more suitable for absorption by photovoltaic cells. The main function of the light conversion film EPE is to improve the power generation efficiency of photovoltaic cells, reduce costs, and increase the power generation of photovoltaic power stations.

[0026] EPE (Expandable Polyethylene) is polyethylene, also known as pearl cotton.

[0027] The light conversion film EPE, specifically, is EPE added with an ultraviolet absorber (uv absorber) and light conversion powder, which can convert ultraviolet light into light directly absorbable by photovoltaic cells.

[0028] The ultraviolet-resistant EPE, specifically, is EPE added with an ultraviolet absorber (uv absorber), which has a strong blocking effect on ultraviolet rays.

[0029] In some embodiments, the battery cells 3-1 used in the heterojunction half-cell string 3 are heterojunction half-cell double-sided battery cells, and the battery sizes have multiple sizes, such as 182mm * 105mm, 210mm * 105mm, 182mm * 91mm.

[0030] Optionally, the positive and negative electrodes of the heterojunction half-cell string 3 are connected in series. Specifically, they are connected in series through low-temperature solder tapes.

[0031] Photovoltaic solder tape refers to a material composed of a copper tape of a certain size with a uniformly thick tin-based solder coated on its surface.

[0032] Photovoltaic solder tapes include normal-temperature solder tapes and low-temperature solder tapes. Among them, the low-temperature solder tape is made of an alloy material with a melting point temperature lower than 450°C on the basis of the normal-temperature solder tape. It generally contains metals such as aluminum, copper, nickel, and zinc, and also adds a certain proportion of welding aids, such as activators, rheological agents, and thickeners. These components can quickly melt at low temperatures and bond with the substrate to be welded to form a firm welded joint.

[0033] In a further technical solution, a junction box is provided on the back of the battery panel;

[0034] Optionally, the junction box can be a three-piece junction box; the three-piece junction box includes a left junction box, a middle junction box, and a right junction box. The left junction box, the middle junction box, and the right junction box all include a box body, a box cover, and modular photovoltaic components installed in the corresponding box body.

[0035] Optionally, the junction box is adhesively bonded to the back of the battery panel with silicone.

[0036] In a further technical solution, an aluminum frame is provided at the four peripheral edges of the battery panel. The aluminum frame is adhesively bonded to the four peripheral edges of the battery panel with silicone for encapsulating and protecting the battery panel.

[0037] Further, grounding holes 8, drainage holes 9, and / or mounting holes 10 are provided on the aluminum frame.

[0038] Specifically, a grounding wire is led out through the grounding hole 8 on the aluminum frame.

[0039] Optionally, on the aluminum frame, the drainage holes 9 can be evenly arranged at a set spacing.

[0040] Specifically, the mounting holes 10 are used to connect the photovoltaic module to the photovoltaic fixing bracket. The positions of the mounting holes 10 can be determined according to the specific structure of the bracket. In this embodiment, the mounting holes 10 can be arranged at the four corner positions of the photovoltaic module.

[0041] In this embodiment, for the front and back of the tempered glass, the side facing the light is the front, and the side facing away from the light is the back.

[0042] The above-mentioned method for installing the photovoltaic module is as follows: Stack the back tempered glass 5 with a reflective film, anti-ultraviolet EPE 4, heterojunction half-cell battery string 3, light-converting film EPE 2, and front-coated tempered glass 1 in sequence from bottom to top.

[0043] The positive and negative electrodes of the heterojunction half-cell battery string 3 are connected in series through low-temperature solder tapes. Then, a certain amount of silicone is injected onto the aluminum frame, and then the aluminum frame is assembled onto the battery panel. Then, the junction box 6 is adhesively bonded to the back of the back tempered glass 5 with a reflective film with silicone.

[0044] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0045] Although the specific implementation manners of the present utility model have been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications or deformations that can be made without creative efforts on the basis of the technical solution of the present utility model are still within the protection scope of the present utility model.

Claims

1. A heterojunction photovoltaic module for improving output power, characterized in that: It includes a battery panel, and the battery panel includes a front tempered glass, a light conversion film EPE, a plurality of heterojunction half-cell strings, an anti-ultraviolet EPE, and a back tempered glass that are sequentially laminated; On the back tempered glass, at the positions corresponding to the gaps between the respective cells of the heterojunction half-cell strings, a reflective film is pasted.

2. The heterojunction photovoltaic module for improving output power according to claim 1, wherein: The cells used in the heterojunction half-cell strings are heterojunction half-cell bifacial cells.

3. A heterojunction photovoltaic module for improving output power according to claim 1 or 2, characterized in that: The positive and negative electrodes of the plurality of heterojunction half-cell strings are connected in series through low-temperature solder tapes.

4. The heterojunction photovoltaic module for improving output power according to claim 1, wherein: The front surface of the front tempered glass is coated to increase the light transmittance of the glass.

5. The heterojunction photovoltaic module for improving output power according to claim 1, wherein: The light conversion film EPE is a polyethylene film that can convert the solar spectrum into a film more suitable for absorption by photovoltaic cells.

6. The heterojunction photovoltaic module for improving output power according to claim 1, wherein: A junction box is provided on the back of the battery panel; the junction box is a three-part junction box; the three-part junction box includes a left junction box, a middle junction box, and a right junction box, and the left junction box, the middle junction box, and the right junction box all include a box body, a box cover, and modular photovoltaic components installed in the corresponding box bodies.

7. The heterojunction photovoltaic module for improving output power according to claim 6, wherein: The junction box is bonded to the back of the battery panel with silicone.

8. The heterojunction photovoltaic module for improving output power according to claim 1, wherein: An aluminum frame is provided at the four peripheral edges of the battery panel, and the aluminum frame is bonded to the four peripheral edges of the battery panel with silicone.

9. A heterojunction photovoltaic module for improving output power according to claim 8, characterized in that: The aluminum frame is provided with grounding holes, drainage holes, and mounting holes.

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