CN215644524U - Heat dissipation type photovoltaic module - Google Patents

Abstract

The application relates to a heat dissipation type photovoltaic assembly, which comprises a laminating part and a frame; the laminated part sequentially comprises a transparent cover plate, an upper packaging layer, a solar cell string, a lower packaging layer and a back plate which are stacked, wherein the solar cell string comprises a plurality of solar cells, at least one heat conduction cavity is arranged in the upper packaging layer and the lower packaging layer which are positioned around the solar cell string and at the gap between the solar cells, and heat conduction fillers are arranged in the heat conduction cavity; the upper packaging layer deviates from the surface of the solar cell string and is provided with an upper heat dissipation layer, the lower packaging layer deviates from the surface of the solar cell string and is provided with a lower heat dissipation layer, and the upper surface of the upper heat dissipation layer and the lower surface of the lower heat dissipation layer are provided with grooves which are arranged in a staggered mode. This application has improved photovoltaic module's radiating effect and generating efficiency effectively through the setting on heat conduction chamber and upper and lower heat dissipation layer to the succinct compactness of subassembly structure has been kept.

Description

Heat dissipation type photovoltaic module

Technical Field

The present application relates to the field of photovoltaic technology, and in particular, to a heat dissipating photovoltaic module.

Background

With the social progress and the continuous development of industrialization, energy contradiction and environmental problems are more and more prominent, and the development of various clean energy sources is a necessary trend. In recent years, the photovoltaic industry is rapidly developed, technology updating is gradually accelerated, the current photovoltaic industry is developing diversified products, and a solar cell is one of the most important products in the photovoltaic technical field. A solar cell, also known as a "solar chip" or "photovoltaic cell", is a device that directly converts light energy into electrical energy through a photoelectric effect or a photochemical effect. Nowadays, the development and application of solar cells have been greatly developed, and the requirements for various performances are also higher and higher.

SUMMERY OF THE UTILITY MODEL

In view of the problems in the background art, the present application provides a heat dissipation type photovoltaic module.

The heat dissipation type photovoltaic module comprises a laminating piece and a frame; the laminated part sequentially comprises a transparent cover plate, an upper packaging layer, a solar cell string, a lower packaging layer and a back plate which are stacked, wherein the solar cell string comprises a plurality of solar cells, heat conducting cavities are arranged in the upper packaging layer and/or the lower packaging layer which are positioned around the solar cell string and at the gap between the solar cells, and heat conducting fillers are arranged in the heat conducting cavities; in addition, the surface that goes up the encapsulation layer and deviates from the solar cell cluster is equipped with the heat dissipation layer, the encapsulation layer deviates from down the surface of solar cell cluster is equipped with down the heat dissipation layer, go up the upper surface on heat dissipation layer with the lower surface on heat dissipation layer has the recess of crisscross arrangement down.

Compared with the prior art, in the embodiment of the application, on one hand, a heat conduction cavity is additionally arranged in the upper packaging layer and/or the lower packaging layer around the solar cell string and the upper packaging layer and/or the lower packaging layer at the gap of the solar cell, and the heat conduction cavity is internally provided with heat conduction filler; on the other hand, an upper heat dissipation layer and a lower heat dissipation layer with grooves arranged in a staggered mode are additionally arranged on the surfaces of the heat dissipation layers. Through the arrangement of the heat conduction cavity, the upper heat dissipation layer and the lower heat dissipation layer, the heat dissipation performance of the photovoltaic assembly is effectively improved, and the power generation efficiency of the photovoltaic assembly is improved; and the heat dissipation performance and the power generation efficiency of the photovoltaic module are improved, and meanwhile, the compactness and the compactness of the structure of the photovoltaic module are still kept.

Drawings

FIG. 1 is a schematic structural view of a laminate according to some embodiments of the present application;

FIG. 2 is a schematic diagram of a solar cell string according to some embodiments of the present application;

FIG. 3 is an enlarged partial cross-sectional view of an upper encapsulation layer according to some embodiments of the present application;

FIG. 4 is an enlarged partial cross-sectional view of a laminate according to some embodiments of the present application.

Detailed Description

Embodiments of the present invention will be described in detail below. The following embodiments are merely used to more clearly illustrate the technical solutions of the present application, and therefore, the following embodiments are only used as examples, and the scope of the present application is not limited thereby. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

After the solar cell panel is illuminated, light energy is converted into electric energy and also can generate heat energy. The temperature of the solar cell panel is increased, so that the power generation conversion efficiency of the solar cell panel is reduced, and the overall power generation amount of the solar cell is reduced. Particularly, the outdoor working temperature of the photovoltaic module can reach 40-55 ℃, and according to the temperature coefficient characteristic of the photovoltaic cell, the working voltage is reduced along with the temperature rise, so that the conversion efficiency of the photovoltaic cell is reduced. The photoelectric conversion efficiency of the crystalline silicon battery is reduced by about 0.35% when the temperature of the battery rises by 1 ℃, and the photoelectric conversion efficiency of the heterojunction battery is reduced by 0.24%. Therefore, the photovoltaic module can be effectively radiated in time, and the photoelectric conversion efficiency of the module can be improved.

In view of the above technical objects, some embodiments of the present application provide a heat dissipation type photovoltaic module, which includes a laminate and a frame. Fig. 1 is a schematic structural view of a laminate according to the present embodiment, and as shown in fig. 1, the laminate sequentially includes a transparent cover sheet 1, an upper encapsulant layer 2, a solar cell string 3, a lower encapsulant layer 4, and a back sheet 5, which are stacked as a whole. Wherein the solar cell string 3 comprises a plurality of solar cells, fig. 2 is a schematic view of a solar cell string according to some embodiments, and fig. 2 shows a region 3-1 around the solar cell string and a region 3-2 at a gap formed between adjacent solar cells. In the embodiment of the application, a plurality of heat conducting cavities are arranged in the upper packaging layer and/or the lower packaging layer which are positioned at the periphery 3-1 of the solar cell string and at the gap 3-2 of the solar cell. Fig. 3 is an enlarged partial cross-sectional view of an upper encapsulation layer according to some embodiments. As shown in fig. 3, a plurality of heat conducting cavities 6 are provided in the upper package layer 2, and heat conducting fillers 7 are provided in the heat conducting cavities 6. In this embodiment, the heat conduction filler is the heat conduction granule, and heat conduction cavity and heat conduction granule in last encapsulated layer and the lower encapsulated layer can play the heat conduction effect, in time effectively derive the inside heat of photovoltaic module.

In addition, in the heat dissipation type photovoltaic module provided by the embodiment, an upper heat dissipation layer and a lower heat dissipation layer are additionally arranged. FIG. 4 is an enlarged partial cross-sectional view of a laminate according to some embodiments. As shown in fig. 4, the laminate comprises a transparent cover sheet 1, an upper encapsulant layer 2, a solar cell string 3, a lower encapsulant layer 4, and a back sheet 5, which are stacked in this order. Wherein, an upper heat dissipation layer 21 is arranged on the surface of the upper packaging layer 2 departing from the solar cell string 3, and a lower heat dissipation layer 41 is arranged on the surface of the lower packaging layer 4 departing from the solar cell string 3. The upper surface of the upper heat dissipation layer 21 is provided with first grooves 22 which are arranged in a staggered manner; the lower surface of the lower heat dissipation layer 41 is provided with second grooves 42 which are arranged in a staggered manner. The arrangement of the first groove and the second groove increases the area of heat exchange between the upper heat dissipation layer and the external heat dissipation layer, and further contributes to heat dissipation of the photovoltaic module.

Compared with the prior art, in the embodiments of the present application, on one hand, a heat conduction cavity is additionally provided in the upper encapsulation layer and/or the lower encapsulation layer around the solar cell string and in the upper encapsulation layer and/or the lower encapsulation layer at the gap of the solar cell pieces, and a heat conduction filler is provided in the heat conduction cavity; on the other hand, an upper heat dissipation layer with grooves in staggered arrangement on the upper surface is additionally arranged on the surface of the upper packaging layer, which is far away from the solar cell string, and a lower heat dissipation layer with grooves in staggered arrangement on the lower surface is additionally arranged on the surface of the lower packaging layer, which is far away from the solar cell string. Through the arrangement of the heat conducting cavity, the upper heat radiating layer and the lower heat radiating layer, the heat radiating effect of the photovoltaic module is effectively improved, so that the effect of improving the power generation efficiency is achieved, through detection, according to the heat radiating type photovoltaic module of the partial embodiment of the application, the working temperature is reduced to 40-43 ℃, and the power generation efficiency of the photovoltaic module is improved. Meanwhile, the photovoltaic module provided by the embodiment of the application has better heat dissipation performance and power generation efficiency, and simultaneously keeps the simple and compact structure of the module.

In some embodiments of the present application, the heat conductive filler in the heat conductive cavity is heat conductive particles, and the heat conductive particles may be selected from one of graphene particles, silicon nitride particles, aluminum nitride particles, and boron nitride particles. These thermally conductive particles are commercially available from well-known commercial sources.

In some embodiments of the present application, the heat conductive filler in the heat conductive cavity is heat conductive particles, and the heat conductive particles are carbon-coated metal nanoparticles, which are commercially available through well-known commercial sources. The metal nano-particles have relatively good heat conductivity coefficient, but are easy to oxidize in the environment and lose the original performance, when the carbon-coated surface modification is carried out on the metal nano-particles, for example, the metal nano-particles are coated by adopting materials such as graphite fibers, carbon, silicon carbide and the like, a series of physicochemical properties of the metal nano-particles can be improved, and the carbon-coated metal nano-particles obtained after the surface modification can have the characteristics of oxidation resistance, acid and alkali corrosion resistance, difficult agglomeration, good dispersion performance in a matrix, high binding capacity at a phase interface and the like. Therefore, the carbon-coated metal nanoparticles are a preferred choice for the thermally conductive particles in this application. In some embodiments of the present application, a heat conduction cavity is additionally disposed in the upper packaging layer and/or the lower packaging layer around the solar cell string and in the upper packaging layer and/or the lower packaging layer in the gap of the solar cell, and the heat conduction cavity is internally provided with carbon-coated metal nanoparticles, so that heat dissipation of the photovoltaic module is facilitated, the working temperature of the photovoltaic module is reduced, the power generation efficiency of the photovoltaic module is improved, and aging of materials in the photovoltaic module can be slowed down.

In some embodiments of the present application, the total volume of the plurality of thermally conductive cavities accounts for 5% -10% of the total volume of the upper and lower encapsulant layers. If the ratio of the total volume of the heat conduction cavity in the total volume of the upper packaging layer and the lower packaging layer is too small, the volume of the heat conduction filler which can be filled in the heat conduction cavity is also small, and the effective heat conduction effect cannot be realized; if the ratio of the total volume of the heat conducting cavity to the total volume of the upper encapsulating layer and the lower encapsulating layer is too large, the packaging stability of the upper encapsulating layer and the lower encapsulating layer can be adversely affected. Therefore, the total volume of a plurality of heat conduction cavities accounts for 5% -10% in last encapsulating layer and lower encapsulating layer total volume in this application to when obtaining effectual heat conduction radiating effect, also can guarantee that the holistic encapsulation effect of subassembly is not influenced.

In some embodiments of the present application, the upper heat dissipation layer and/or the lower heat dissipation layer are filled with a thermally conductive nanosheet. The thickness of going up the heat dissipation layer with the heat dissipation layer is 0.1mm ~0.3mm respectively down, the thickness of heat conduction nanometer piece is in 4~20nm within ranges, further adds the heat conduction nanometer piece in last heat dissipation layer and/or lower heat dissipation layer, can further strengthen photovoltaic module's radiating effect under the prerequisite of encapsulated layer, lower encapsulated layer thickness in the unobvious increase, passes to the surface of upper and lower encapsulated layer with the inside heat of photovoltaic module rapidly, and essential oil photovoltaic module's apron and backplate dispel the heat. Further, the thermally conductive nanosheets described in the embodiments of the present application are selected from one of silicon nitride nanosheets, aluminum nitride nanosheets, and boron nitride nanosheets, all of which are commercially available through well-known, commercially available channels.

In some embodiments of the present application, the grooves arranged in a staggered manner form a grid, and the grid-shaped grooves can form long-range and ordered heat dissipation channels on the surfaces of the upper and lower encapsulation layers, so as to further increase the heat dissipation area of the surfaces of the upper and lower encapsulation layers, and make the heat dissipation effect of the photovoltaic module more remarkable.

In some embodiments of the present application, an encapsulation material is further disposed in the heat conducting cavity, and the encapsulation material may be the same as or different from the material of the upper encapsulation layer and the material of the lower encapsulation layer. The upper packaging layer, the lower packaging layer, the upper heat dissipation layer, the lower heat dissipation layer and the packaging material arranged in the heat conduction cavity can be EVA adhesive films, PVB adhesive films or POE adhesive films. The adhesive films can be purchased and obtained through known commercial channels, and when the adhesive films are used in the photovoltaic module, the defect of low thermal conductivity of the adhesive films can be overcome.

In some embodiments of the present application, the frame seals the laminate at the sides of the laminate; the frame orientation the surface of lamination spare is equipped with heat conduction silica gel to further improve photovoltaic module's radiating effect. The heat-conducting silica gel has high heat conductivity, good electrical insulation, wider use temperature and good use stability. This application is equipped with heat conduction silica gel on photovoltaic module's frame towards the surface of lamination piece, can fill the clearance of frame and lamination piece contact surface well, extrudes the contact surface with the air. The air is a poor conductor of heat, can hinder the transmission of heat between the contact surface, and the heat conduction silica gel that establishes towards the surface of lamination piece at photovoltaic module's frame can make frame and lamination piece contact more fully in the embodiment of this application, plays better heat dissipation effect through the silica gel of high thermal conductivity.

Variations and modifications to the above-described embodiments may occur to those skilled in the art based upon the disclosure and teachings of the above specification. Therefore, the present application is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present application should fall within the scope of the claims of the present application. In addition, although specific terms are used herein, they are used in a descriptive sense only and not for purposes of limitation.

Claims (10)

1. A heat dissipation type photovoltaic assembly comprises a laminating piece and a frame; the lamination part comprises a laminated transparent cover plate, an upper packaging layer, a solar cell string, a lower packaging layer and a back plate in sequence, wherein the solar cell string comprises a plurality of solar cells and is characterized in that: a heat conduction cavity is arranged in the upper packaging layer and/or the lower packaging layer which is positioned at the periphery of the solar cell string and at the gap of the solar cell pieces, and heat conduction filler is arranged in the heat conduction cavity; the upper packaging layer deviates from the surface of the solar cell string and is provided with an upper heat dissipation layer, the lower packaging layer deviates from the surface of the solar cell string and is provided with a lower heat dissipation layer, and the upper surface of the upper heat dissipation layer and the lower surface of the lower heat dissipation layer are respectively provided with grooves which are arranged in a staggered mode.

2. The heat dissipating photovoltaic module of claim 1, wherein the thermally conductive filler is thermally conductive particles.

3. The heat dissipating photovoltaic module of claim 2, wherein the thermally conductive particles are selected from one of graphene particles, silicon nitride particles, aluminum nitride particles, boron nitride particles, and carbon-coated metal nanoparticles.

4. The heat dissipating photovoltaic module of claim 1, wherein the total volume of the thermal conducting cavity is 5% to 10% of the total volume of the upper encapsulant layer and the lower encapsulant layer.

5. The heat dissipating photovoltaic module according to claim 1, wherein the upper and/or lower heat dissipating layer is filled with a thermally conductive nano-sheet.

6. The heat dissipating photovoltaic module of claim 5, wherein the thermally conductive nanoplatelets are selected from one of silicon nitride nanoplatelets, aluminum nitride nanoplatelets, and boron nitride nanoplatelets.

7. The heat dissipation type photovoltaic module as recited in claim 1, wherein the upper and lower heat dissipation layers have a thickness of 0.1mm to 0.3mm, respectively.

8. The heat dissipating photovoltaic module of claim 1, wherein the staggered grooves form a grid.

9. The heat dissipation type photovoltaic module of claim 1, wherein the upper encapsulant layer, the lower encapsulant layer, the upper heat dissipation layer, and the lower heat dissipation layer are EVA adhesive film, PVB adhesive film, or POE adhesive film.

10. The heat dissipating photovoltaic module of any of claims 1 to 9, wherein the bezel borders the laminate on its sides; the frame orientation the surface of lamination piece is equipped with heat conduction silica gel.

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