TWM482849U - Solar cell back plate structure - Google Patents

Description

Solar battery backplane structure

The present invention relates to a solar cell backplane structure, and more particularly, to a solar cell backplane structure having good heat dissipation.

With the development of human civilization, the world faces serious energy crisis and environmental pollution. Therefore, in order to solve the global energy crisis and reduce environmental pollution, photovoltaic solar cells that can directly convert solar energy into electrical energy have become the main development focus of the industry. The solar cell module is mainly composed of a solar cell itself and a solar cell back plate coated on the outside of the solar cell to provide good airtight protection of the solar cell module.

A solar cell usually has a plurality of battery modules electrically connected in series or in parallel to obtain a desired voltage or current. In order to obtain higher photoelectric conversion efficiency, each of the battery modules needs to have similar characteristics. However, during use, one or a group of cells may be missing such as cracks, internal connection failure, or shading. When one of the battery blocks or a group of battery components in the series branch of the plurality of battery modules is missing, the missing battery cell or battery component is converted into a power consumption unit by the power generating unit in the module composed of the solar battery. Therefore, the missing battery piece or the battery component not only fails to contribute to the battery module, but also consumes electric power generated by other battery pieces or battery components, and generates heat, and a hot spot effect occurs.

In addition, since the modules formed by the solar cells are usually installed outdoors, if the generated heat energy cannot be quickly and effectively eliminated under outdoor high-temperature exposure, the adjacent battery cells or battery components are ignited, which not only reduces the power generation of the solar battery module. Efficiency, in severe cases, causes the entire solar cell module to be disabled.

Therefore, in order to avoid the hot spot effect of the solar cell, a diode is often connected in parallel with the solar cell module, so that the normal operation of other cells or battery modules can be maintained when the cell or battery component is missing, and heat is prevented. The plaque effect occurs.

The working principle of the solar cell is to absorb the visible light in the solar energy by using the photoelectric material, and then convert the visible light into electricity through the photoelectric conversion reaction, so the higher the photoelectric conversion rate can effectively reduce the photovoltaic cost. Since solar energy includes infrared rays in addition to visible light, and the frequency of infrared rays is closer to the natural frequency of the solid matter than the frequency of visible light, it is easy to cause resonance to generate thermal energy under long-time illumination. Therefore, in the conventional method of avoiding the hot spot effect, the use of transparent glass to block the penetration of infrared rays is also used.

Therefore, in the case where most of the conventional methods can only avoid heat generation, etc., in order to avoid the hot spot effect, when the solar cell or the battery assembly is cracked or the internal connection fails and heat energy accumulation occurs, it cannot be effective. Exhaust heat, there is still a risk of hot spot effect, and the solar backing materials used today are more focused on airtightness and waterproofing, which leads to the heat dissipation of solar cell modules being tested.

Therefore, there is an urgent need in the industry to develop a solar cell backplane structure with excellent heat dissipation.

In view of this, the present invention provides a solar battery backboard structure, including: inner cover a first thermally conductive adhesive layer formed on the inner cover; a core layer formed on the first thermally conductive adhesive layer, the first thermally conductive adhesive layer being sandwiched between the core layer and the inner cover; a second thermally conductive adhesive layer on the core layer, the core layer being sandwiched between the first thermally conductive adhesive layer and the second thermally conductive adhesive layer; an intermediate layer formed on the second thermally conductive adhesive layer, by the second thermal conduction a layer is disposed on the core layer; a third thermally conductive adhesive layer formed on the intermediate layer, the intermediate layer being sandwiched between the second thermally conductive adhesive layer and the third thermally conductive adhesive layer; and formed in the first layer The three thermally conductive layers are then coated on the outer layer, and the outer cover layer is followed by the third thermally conductive adhesive layer to the intermediate layer.

In the solar cell backsheet structure described above, the intermediate layer has a thickness of between 25 and 75 microns.

In the solar cell backsheet structure described above, the core layer has a thickness of between 75 and 275 microns.

In the solar cell backsheet structure described above, the thickness of the inner cladding layer and the outer cladding layer are respectively between 25 and 50 micrometers.

In the foregoing solar cell backplane structure, the thickness of the first thermally conductive adhesive layer, the second thermally conductive adhesive layer and the third thermally conductive adhesive layer are respectively between 8 and 25 micrometers, and in one embodiment the first thermal conduction is followed by The thickness of the layer, the second thermally conductive adhesive layer and the third thermally conductive adhesive layer are the same.

In the above solar cell backsheet structure, the material of the intermediate layer is selected from at least one of the group consisting of copper, aluminum and graphite.

In the solar cell backsheet structure described above, the inner cladding layer is a fluoropolymer film. In one embodiment, the fluoropolymer film is selected from the group consisting of a polyvinyl fluoride (PVF) film, a polyvinylidene fluoride (PVDF) film, and a polytrifluoroethylene. At least one of (Polychlorotrifluorethylene, PCTFE), a polytetrafluoroethylene (PTFE) film, and an ethylene-tetra-fluoro-ethylene (ETFE) film. In a preferred embodiment, the fluoropolymer film is a polytetrafluoroethylene film or an ethylene-tetrafluoroethylene polyester film.

In the solar cell backsheet structure described above, the overcoat layer is a fluoropolymer film. In one embodiment, the fluoropolymer film is selected from at least one of a polyvinyl fluoride film, a polyvinylidene fluoride film, a polytetrafluoroethylene film, and an ethylene-tetrafluoroethylene polyester film. In a preferred embodiment, the fluoropolymer film is a polytetrafluoroethylene film or an ethylene-tetrafluoroethylene polyester film.

In the solar cell backsheet structure described above, the core layer is made of polyethylene terephthalate.

In the foregoing solar cell backsheet structure, the layers of the first thermally conductive adhesive layer, the second thermally conductive adhesive layer and the third thermally conductive adhesive layer comprise a polymer and a thermally conductive material.

In one embodiment, the thermally conductive material is selected from at least one of alumina, aluminum nitride, and boron nitride. Further, the polymer is selected from at least one of an epoxy resin and a synthetic rubber binder.

In another embodiment, the first thermally conductive adhesive layer, the second thermally conductive adhesive layer and the third thermally conductive adhesive layer are each in a layer of 10 to 50% by weight based on the total weight of each layer. .

In the solar cell backplane structure of the present invention, the inner cover layer, the core layer, the intermediate layer and the outer cover layer each have a heat conductive adhesive layer, and the heat conductive adhesive layer can effectively transport the heat energy, thereby making the creation of the creation The solar cell backsheet has good thermal conductivity.

In addition, in the solar cell backplane structure of the present invention, the intermediate layer is thermally conductive A good metal material or graphite can effectively transfer and transfer heat to the outside. When applied to a solar cell module, the solar cell module can be exposed to the outdoors and/or when a cell or a battery component is missing. It can effectively conduct heat energy and improve the photoelectric conversion efficiency of the overall solar cell module.

In summary, the solar cell backplane structure of the present invention can effectively transfer heat energy to the outside when the solar cell sheet or the battery component is cracked, internal connection failure or shading occurs due to the heat conductive adhesive layer and the intermediate layer. In order to avoid the accumulation of heat in the missing cell or battery module, it is necessary to maintain the operation of the entire solar cell module and improve the performance of the solar cell module.

1‧‧‧Solar battery backplane structure

10‧‧‧ inner cladding

11‧‧‧First thermal conduction layer

12‧‧‧ core layer

13‧‧‧Second thermal conduction layer

14‧‧‧Intermediate

15‧‧‧ Third thermal conduction layer

16‧‧‧Overcoat

Fig. 1 is a schematic cross-sectional view showing the structure of the solar cell back sheet of the present invention.

The present invention is fully understood by reference to the following detailed description and exemplary embodiments, which are intended to illustrate non-limiting embodiments of the present invention.

It is to be understood that the structure, the proportions, the size and the like of the drawings are only used in conjunction with the disclosure of the specification for the understanding and reading of those skilled in the art, and are not intended to limit the implementation of the present invention. The qualifications, the modification of any structure, the change of the proportional relationship or the adjustment of the size, should not fall under the purpose of the creation and the purpose of the creation, should still fall within the technical content revealed by this creation. Within the scope of coverage. At the same time, the terms "upper", "inside", "outside", "first", "second", "third" and "one" as quoted in this manual are also for convenience only. , rather than limiting the scope of the creation of the creation, the change or adjustment of its relative relationship, if there is no substantive change in the content of the technology, The scope of the application.

Please refer to FIG. 1 , which is a schematic cross-sectional view of the solar cell back sheet structure of the present invention. As shown in FIG. 2, the solar cell backsheet structure 1 of the present invention comprises: an inner cover layer 10; a first heat conductive adhesive layer 11 formed on the inner cover layer 10; formed on the first heat conductive adhesive layer 11 The core layer 12 is such that the first thermally conductive adhesive layer 11 is sandwiched between the core layer 12 and the inner cladding layer 10; the second thermally conductive adhesive layer 13 is formed on the core layer 12, and the core layer 12 is sandwiched between the core layer 12 Between the first thermally conductive adhesive layer 11 and the second thermally conductive adhesive layer 13; an intermediate layer 14 formed on the second thermally conductive adhesive layer 13 by the second thermally conductive adhesive layer 13 to the core layer 12; formed in the middle a third thermally conductive adhesive layer 15 on the layer 14, the intermediate layer 14 being sandwiched between the second thermally conductive adhesive layer 13 and the third thermally conductive adhesive layer 15; and an outer coating layer formed on the third thermally conductive adhesive layer 15 16. The outer cover 16 is followed by the third thermally conductive adhesive layer 15 to the intermediate layer 14.

In this embodiment, the intermediate layer is a metal foil or graphite having a thickness of 25 to 75 micrometers. Preferably, the metal of the metal foil is selected from at least one of the group consisting of copper and aluminum.

In this embodiment, the thickness of the first thermally conductive adhesive layer, the second thermally conductive adhesive layer and the third thermally conductive adhesive layer may be the same or different, and each layer has a thickness of 8 to 25 micrometers. In a preferred embodiment, the first thermally conductive adhesive layer, the second thermally conductive adhesive layer and the third thermally conductive adhesive layer have the same thickness.

In one embodiment, the inner cover layer and the outer cover layer are fluoropolymer films, and the fluoropolymer film is a polytetrafluoroethylene film or an ethylene-tetrafluoroethylene polyester film.

In the solar cell backplane structure of the present invention, there is no particular limitation on the material of the core layer. In this embodiment, the material of the core layer includes, but is not limited to, In polyethylene terephthalate.

Examples 1 to 5 Preparation of Thermal Conductive Adhesive

1 part by weight of a diaminodiphenylsulfone (DDS) hardener, 2 parts by weight of methyl ethyl ketone (MEK), and a thermal conductive material in the form of a powder of the kind shown in Table 1 are added to 12 parts by weight of the epoxy resin. The thermal conductive adhesive used in the present creation was prepared, subjected to heat conduction analysis, and the results are reported in Table 1, wherein the calculation of the content of the thermally conductive material shown in Table 1 was not included in the organic solvent.

Comparative example 1

It was made using the methods as in Examples 1 to 5, but no heat conductive material was added to the heat conductive adhesive.

Thermal Conduction Analysis Test:

The heat conduction analysis test was performed according to the ASTM B5470 method using a Hot Disk thermal conductivity meter (Rui Ling Technology Co., Ltd.; LW-9389), that is, the heat conduction of the first and second sides of the sensor as in Examples 1 to 5 and Comparative Example 1 was applied. Next, the sensor was attached to the outside of the two adhesives, and the two adhesive plates were placed on the outside of the two adhesives and the sensor, and the results were recorded in Table 1.

Examples 6 to 10 Preparation of Solar Cell Packages

25 micron PVF film (DuPont, PV2025) as the inner coating; 250 micron PET (Guangzhan Applied Materials Trading Co., Ltd., A461) as the core layer; 40 micron aluminum foil (Japan live light, 8079-O) As an intermediate layer; 25 micron PVF (DuPont, PV2025) as an outer layer, and each of the inner layer, the core layer, the intermediate layer and the outer layer is joined by a thermal conductive adhesive layer having a thickness of 10 micrometers, wherein The type of the thermally conductive adhesive layer was selected according to the embodiment set forth in the second column of Table 2 to fabricate the solar cell backsheet structure of the present invention. The wafer solar cell is coated with the inner cladding layer to fabricate a solar cell package.

Comparative example 2

A solar cell backsheet was produced by the method described in Examples 6 to 10 using the thermally conductive adhesive of Comparative Example 1.

The photoelectric conversion ratios of the solar cells obtained in Examples 6 to 10 and Comparative Example 2 and the internal temperature of the battery sheets were measured, and the test results are reported in Table 2.

Referring to the heat conduction analysis test results of Table 1, it can be seen that compared with Comparative Example 1, the thermally conductive adhesive of the present invention has a high thermal conductivity K value, that is, has a heat conduction effect. In addition, referring to Table 2, the solar cell back sheet structure of the present invention can effectively reduce the temperature inside the cell sheet, and can achieve the effect of improving the photoelectric conversion rate.

It can be seen from the results of the above test examples that the solar battery back plate structure of the present invention has the characteristics of good heat conduction effect, and can effectively remove the heat energy generated in the battery sheet, thereby providing better heat dissipation effect. Therefore, the solar battery back plate structure of the present invention not only provides good heat dissipation effect, but also has excellent heat conduction effect, and can be widely applied to solar cells with heat dissipation requirements.

The above embodiments are merely illustrative of the principles of the present invention and their effects, and are not intended to limit the present invention. Any person skilled in the art can modify and change the above embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this creation should be as listed in the scope of the patent application described later.

1‧‧‧Solar battery backplane structure

10‧‧‧ inner cladding

11‧‧‧First thermal conduction layer

12‧‧‧ core layer

13‧‧‧Second thermal conduction layer

14‧‧‧Intermediate

15‧‧‧ Third thermal conduction layer

16‧‧‧Overcoat

Claims (17)

A solar cell backplane structure includes: an inner cladding layer; a first thermally conductive adhesive layer formed on the inner cladding layer; and a core layer formed on the first thermally conductive adhesive layer to make the first thermally conductive adhesive layer Sandwiched between the core layer and the inner cladding layer; a second thermally conductive adhesive layer formed on the core layer, the core layer being sandwiched between the first thermally conductive adhesive layer and the second thermally conductive adhesive layer; the intermediate layer is formed On the second thermally conductive adhesive layer, the second thermally conductive adhesive layer is followed by the core layer; a third thermally conductive adhesive layer is formed on the intermediate layer, and the intermediate layer is sandwiched between the second thermally conductive adhesive layer And a third thermally conductive adhesive layer; and an outer cover layer formed on the third thermally conductive adhesive layer, the third thermally conductive adhesive layer being followed by the intermediate layer. The solar cell backsheet structure of claim 1, wherein the intermediate layer has a thickness of between 25 and 75 microns. The solar cell backsheet structure of claim 1, wherein the core layer has a thickness of between 75 and 275 microns. The solar cell backsheet structure of claim 1, wherein the thickness of the inner cladding layer and the outer cladding layer are respectively between 25 and 50 micrometers. The solar cell backsheet structure of claim 1, wherein the first thermally conductive adhesive layer, the second thermally conductive adhesive layer and the third thermally conductive adhesive layer have a thickness of 8 to 25 micrometers, respectively. The solar cell back sheet structure according to claim 5, wherein the The first thermally conductive adhesive layer, the second thermally conductive adhesive layer and the third thermally conductive adhesive layer are of the same thickness. The solar cell back sheet structure according to claim 1, wherein the material of the intermediate layer is at least one selected from the group consisting of copper, aluminum and graphite. The solar cell backsheet structure of claim 1, wherein the inner coating layer is a fluoropolymer film. The solar cell backsheet structure according to claim 8, wherein the fluoropolymer film is selected from the group consisting of a polyvinyl fluoride (PVF) film, a polyvinylidene fluoride (PVDF) film, and a polytrifluoroethylene (PCTFE). At least one of a film, a polytetrafluoroethylene (PTFE) film, and an ethylene-tetrafluoroethylene polyester (ETFE) film. The solar cell backsheet structure according to claim 9, wherein the fluoropolymer film is a polytetrafluoroethylene (PTFE) film or an ethylene-tetrafluoroethylene polyester (ETFE) film. The solar cell backsheet structure of claim 1, wherein the outer cover layer is a fluoropolymer film. The solar cell back sheet structure according to claim 11, wherein the fluoropolymer film is selected from the group consisting of a polyvinyl fluoride film, a polyvinylidene fluoride film, a polytrifluoroethylene, a polytetrafluoroethylene film, and ethylene. At least one of a tetrafluoroethylene polyester film. The solar cell back sheet structure according to claim 12, wherein the fluoropolymer film is a polytetrafluoroethylene film or an ethylene-tetrafluoroethylene polyester film. The solar cell back sheet structure according to claim 1, wherein the core layer is made of polyethylene terephthalate. The solar cell backsheet structure of claim 1, wherein the first thermally conductive adhesive layer, the second thermally conductive adhesive layer and the third thermally conductive adhesive layer are each layer Includes polymers and thermally conductive materials. The solar cell backsheet structure of claim 15, wherein the first thermally conductive adhesive layer, the second thermally conductive adhesive layer and the third thermally conductive adhesive layer are each in a total weight of the respective layers. The content of the thermally conductive material is between 10 and 50% by weight. The solar cell backsheet structure of claim 15, wherein the thermally conductive material is selected from at least one of alumina, aluminum nitride, and boron nitride.