CN112242454B

CN112242454B - Encapsulating material and photovoltaic module

Info

Publication number: CN112242454B
Application number: CN202011099293.5A
Authority: CN
Inventors: 张秀芳; 刘俊辉; 郭志球
Original assignee: Zhejiang Jinko Solar Co Ltd; Jinko Solar Haining Co Ltd
Current assignee: Zhejiang Jinko Solar Co Ltd; Jinko Solar Haining Co Ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2024-05-28
Anticipated expiration: 2040-10-14
Also published as: CN112242454A

Abstract

The application provides a packaging material and a photovoltaic module, and relates to the technical field of photovoltaic modules. The packaging material comprises a black reflective film, wherein the black reflective film comprises fluorocarbon resin, black reflective filler and rutile titanium dioxide; wherein the black reflective filler comprises at least one of copper chrome black, iron oxide black or chrome iron black. The application can reduce the light receiving loss of the component, reduce the working temperature of the component and improve the power of the component.

Description

Encapsulating material and photovoltaic module

Technical Field

The application relates to the technical field of photovoltaic modules, in particular to a packaging material and a photovoltaic module.

Background

Solar energy is a renewable resource with high efficiency and no pollution, and is gradually utilized by various industries. The structure of the common photovoltaic module from the front side to the back side sequentially comprises a front side cover plate, a front side packaging adhesive film, a battery piece layer, a back side packaging adhesive film and a back plate. As the application range of solar photovoltaic modules is wider and wider, more and more customers put forth higher demands on the appearance of the photovoltaic modules. The black photovoltaic module such as the full black photovoltaic module is used as a photovoltaic module with special appearance, is suitable for some roof and building integrated projects, and can meet special appearance or attractive requirements of users. The full black photovoltaic module has higher photoelectric conversion efficiency, so that the appearance requirements of some users can be met, and the demand in recent years is continuously increased.

In order to achieve the full black effect of the photovoltaic module, the existing black photovoltaic module generally adopts a black backboard and a frame, wherein inner and outer layer materials of the black backboard are black, and part of solar rays penetrating through a battery piece are absorbed by the black backboard and converted into heat energy, so that the part of rays are difficult to be absorbed and utilized by the battery piece after being reflected. In addition, the existing conventional full black assembly cannot utilize light irradiated on bus bars, blank areas around the assembly, string intervals and sheet intervals or irradiated on the inner layer of the backboard through batteries, and the photovoltaic assembly cannot achieve the full black effect, so that the photovoltaic assembly has certain defects in appearance, the sunlight absorption effect is also influenced, and the photoelectric conversion efficiency of the photovoltaic assembly is also influenced. In addition, the light is absorbed and converted into heat by the black on the component, so that the working temperature of the component can be increased, the power of the component can be reduced, and the service life of the component can be influenced.

Disclosure of Invention

The application aims to provide a packaging material and a photovoltaic module, so as to reduce the light receiving loss of the module, reduce the working temperature of the module and improve the power of the module.

In order to achieve the above purpose, the application adopts the following technical scheme:

according to one aspect of the present application, there is provided an encapsulating material comprising a black reflective film comprising fluorocarbon resin, black reflective filler and rutile titanium dioxide;

wherein the black reflective filler comprises at least one of copper chrome black, iron oxide black or chrome iron black.

In one possible implementation, the black retroreflective film further includes carbon black.

In one possible implementation, the black reflective film further includes polymethyl methacrylate (Polymethyl methacrylate, abbreviated as PMMA).

In one possible implementation, the fluorocarbon resin includes at least one of polyvinyl fluoride (Polyvinyl fluoride, PVF), polyvinylidene fluoride (polyvinylidene fluoride, PVDF), or Ethylene-tetrafluoroethylene copolymer (ETFE).

In one possible implementation, the black retroreflective film further includes an auxiliary agent, wherein the auxiliary agent includes at least an ultraviolet absorber and/or a matting agent.

In one possible implementation manner, the black reflective film comprises the following components in parts by mass:

60-70 parts of fluorocarbon resin, 5-10 parts of black reflective filler, 0-1 part of carbon black, 1-3 parts of rutile titanium dioxide, 0-20 parts of polymethyl methacrylate and 0-5 parts of ultraviolet absorber and/or matting agent.

60-70 parts of fluorocarbon resin, 5-10 parts of black reflective filler, 0.5-1 part of carbon black, 1-3 parts of rutile titanium dioxide, 10-20 parts of polymethyl methacrylate and 0.5-5 parts of ultraviolet absorber and/or matting agent.

62-68 parts of fluorocarbon resin, 6-9 parts of black reflective filler, 0.6-0.9 part of carbon black, 1.5-2.5 parts of rutile titanium dioxide, 12-18 parts of polymethyl methacrylate, and 1-4 parts of ultraviolet absorber and/or flatting agent.

In one possible implementation, the black retroreflective film has a thickness of 10 μm to 100 μm.

In one possible implementation, the black retroreflective film has a thickness of 15 μm to 100 μm.

In one possible implementation, the packaging material further includes an adhesive layer, and the adhesive layer is laminated with the black reflective film.

In one possible implementation, the thickness of the adhesive layer is 20 μm to 110 μm.

In one possible implementation, the light reflectance of the encapsulant is 5% -20%.

According to another aspect of the present application, there is provided a photovoltaic module comprising an encapsulant as above, a backsheet and at least one set of strings of cells disposed between the backsheet and the encapsulant.

In one possible implementation, at least one group of the battery strings includes a plurality of battery pieces, and the battery strings are connected to each other by bus bars;

the encapsulation material has a first portion to correspond to a sheet spacing between adjacent battery sheets;

or the encapsulation material has a second portion to correspond to a string spacing between adjacent battery strings;

Or the encapsulation material has a third portion to correspond to the bus bar;

Or the encapsulation material has a fourth portion to correspond to an edge margin region of the photovoltaic module.

Compared with the prior art, the technical scheme provided by the application can achieve the following beneficial effects:

The packaging material provided by the application comprises a black reflective film, wherein the black reflective film comprises fluorocarbon resin, black reflective filler and rutile titanium dioxide. Wherein the black reflective filler comprises at least one of copper chrome black, iron oxide black or chrome iron black. Therefore, the black reflective filler such as copper-chromium black, iron oxide black or ferrochrome black is adopted, so that the effect of high reflectivity of sunlight infrared wave bands can be achieved, partial infrared light can be reflected by the packaging material to be reused by the component, the utilization efficiency of sunlight is increased, the temperature of the component is reduced, the power of the component is improved, the black appearance can be presented, and the black reflective filler is uniformly distributed in fluorocarbon resin, so that the effects of aging resistance and no migration can be achieved.

Therefore, when the packaging material disclosed by the application is applied to a photovoltaic module, the full black effect is ensured, the light receiving loss of the module can be reduced to the minimum, the working temperature of the module is reduced, the power of the module is improved, and the service life of the module is prolonged. The power of the photovoltaic module containing the packaging material can be improved by at least 10W-15W compared with the existing black internal coating back plate module, and can be improved by at least 2W-3W compared with the existing black grid back plate module.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a photovoltaic module according to an exemplary embodiment of the present application;

fig. 2 is a schematic structural view of another photovoltaic module according to an exemplary embodiment of the present application;

fig. 3 is a schematic structural view of another photovoltaic module according to an exemplary embodiment of the present application.

Reference numerals:

1-packaging material;

2-battery strings; 21-string spacing; 3-cell sheets; 31-piece pitch; 4-an edge margin; 5-bus bar.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone.

It is to be understood that, as used in the examples of the application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. All technical features mentioned herein as well as preferred features may be combined with each other to form new solutions, unless specified otherwise. Unless defined or otherwise indicated, the terms of art and science used herein have the same meaning as those familiar to one of ordinary skill in the art.

In the present invention, unless otherwise indicated, the numerical range "a-b" represents a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "60-70" means that all real numbers between "60-70" have been listed throughout, and "60-70" is simply a shorthand representation of a combination of these values. The "range" disclosed herein may take the form of a lower limit and an upper limit, which may be one or more lower limits and one or more upper limits, respectively.

As understood by those skilled in the art, as in the background art, the present packaging materials have a certain defect more or less, and most of them use carbon black as black filler, and the carbon black is basically fully absorbed to sunlight, so that the light utilization efficiency is reduced. For example, in some existing black (or full black) photovoltaic modules, the back sheet adopts a structure of full black fluorine film and full black coating of the back sheet inner layer, and the bus bars are free of shielding, or black paint bus bars are adopted; in the mode, carbon black is generally used as black filler, and the carbon black is basically fully absorbed to light, so that the assembly string spacing, the sheet spacing and the light irradiated to the backboard through the battery sheet cannot be utilized; in addition, the light is absorbed and converted into heat by the black on the component, so that the working temperature of the component is increased, the power of the component is reduced, and the service life of the component is seriously influenced. For another example, in other existing black (or full black) photovoltaic modules, a structure of coating black grid paint/black grid glass/black grid backboard with a full black fluorine film on the outer layer and a full black fluorine film on the inner layer of the backboard is adopted; also, this approach generally uses carbon black as a filler to create a black effect, and sunlight received by the black-coated areas cannot be utilized. In addition, some manufacturers begin to print black grids by adopting black metal reflective coating in the prior art, but the technology is not mature at present, and delamination phenomenon after grid aging easily occurs in practical application; and the black grid is required to be printed according to the corresponding model, the grid can be rolled after being thoroughly dried, the production efficiency is low, and the working procedure is complex.

Therefore, in order to overcome the defect of the prior art and further meet the current market demand, the technical scheme of the embodiment of the invention provides the packaging material and the photovoltaic module, so that the light receiving loss of the packaging material of the photovoltaic module is reduced through the black reflective film, and the module power is improved.

Based on this, embodiments of the present application provide an encapsulation material that includes a black reflective film that may include fluorocarbon resin, black reflective filler, and rutile titanium dioxide. In some embodiments, the black reflective filler comprises at least one of copper chrome black, iron oxide black, or chrome iron black.

The packaging material provided by the embodiment of the application can solve the problems that the conventional full black assembly cannot utilize light irradiated on the black bus bar, the periphery (blank or edge area) of the assembly, the string spacing and the sheet spacing and the inner layer of the backboard through the battery, and can reduce the working temperature of the assembly and improve the power of the assembly while ensuring the full black effect.

Specifically, the packaging material comprises a black reflective film, wherein the black reflective film comprises black reflective fillers, and the black reflective fillers can be any one or a mixture of at least two of copper chrome black, iron oxide black or chrome iron black, so that the black reflective fillers are black in appearance, can provide a black appearance effect for the component, have a certain reflective effect, particularly have very high reflectivity in the sunlight infrared band, and can reflect infrared light to the crystalline silicon battery to be reused by the component, thereby achieving the effect of guaranteeing the full black effect and reducing the light receiving loss of the component. Carbon black is usually adopted as black filler in the prior art, and the carbon black is basically fully absorbed to light, so that the problem that light irradiated to the back plate through the bus bar, the string spacing, the sheet spacing, the periphery of the assembly (blank or edge area) or the battery piece cannot be utilized can be solved. Moreover, the black metal particles such as copper-chromium black, iron oxide black or chromium-iron black have wide sources, are easy to obtain, have low cost, and have good physical properties, weather resistance, acid and alkali resistance and the like.

Meanwhile, the black reflective filler is uniformly distributed in the fluorocarbon resin, so that the effects of aging resistance and no migration can be achieved. The black reflective film also comprises rutile titanium dioxide which has the characteristics of high coverage, high weather resistance, easy dispersion and the like, and the black reflective film is added with the rutile titanium dioxide which can play roles of color mixing and light reflection when being matched with black reflective filler. Therefore, the black reflective film can present black appearance through the synergistic interaction of the black reflective filler, the rutile titanium dioxide and the fluorocarbon resin, and the prepared packaging material has good reflectivity and power generation efficiency, can achieve the effect of infrared light reflection, reduces the light receiving loss of the component, increases the utilization efficiency of sunlight, reduces the working temperature of the component and improves the power of the component.

The packaging material containing the black reflective film is very suitable for being used as the packaging material of a photovoltaic module. Compared with the existing black inner coating backboard component, the power of the photovoltaic component containing the packaging material provided by the embodiment of the application can be improved by at least 10W-15W; compared with the existing black grid back plate assembly, the power of the photovoltaic assembly containing the packaging material provided by the embodiment of the application can be improved by at least 2W-3W.

In some embodiments, the black reflective filler may be copper chrome black, may be iron oxide black, may be chrome iron black, may be a mixture of copper chrome black and iron oxide black, may be a mixture of iron oxide black and chrome iron black, may be a mixture of copper chrome black, iron oxide black and chrome iron black, and the like. Since the characteristics of the materials of copper chrome black, iron oxide black and chrome iron black are similar, the influence of each material on the black appearance, the reflective effect and the like of the black reflective film is similar. Therefore, when the black reflective filler includes a mixture formed by arbitrarily mixing copper chrome black, iron oxide black and chrome iron black, the respective components may be mixed in an arbitrary ratio; for example, when the black reflective filler is a mixture of copper-chromium black and iron oxide black, the mixture of copper-chromium black and iron oxide black in any proportion does not affect the performance of the black reflective film, and the specific proportion or content thereof is not particularly limited and can be regulated and controlled by a person skilled in the art according to practical situations.

To further improve the performance of the black retroreflective film, the black retroreflective film may also include other ingredients to improve the performance desired or required for any particular application. Illustratively, in some embodiments, the black retroreflective film may include carbon black, but is not limited thereto, e.g., in other embodiments, a similar black filler may be used in place of carbon black.

The black retroreflective film includes optional carbon black, i.e., the black retroreflective film may or may not include carbon black, and when the black retroreflective film includes carbon black, the content of carbon black is also substantially less than the content of black retroreflective filler. The added small amount of black carbon black can be used as a color matching auxiliary agent. It should be noted that, the specific type or the addition amount of the carbon black is not particularly limited in the embodiment of the invention, and can be regulated and controlled by a person skilled in the art according to actual situations, for example, the carbon black can be selectively added or not added according to actual application scenes or product requirements.

To further improve the performance of the black retroreflective film, the black retroreflective film may also include other ingredients to improve the performance desired or required for any particular application. Illustratively, in some embodiments, the black retroreflective film may include polymethyl methacrylate (PMMA), but is not limited thereto, e.g., in other embodiments, similar polyester polymers may be used in place of polymethyl methacrylate.

The black retroreflective film includes optional PMMA, i.e., the black retroreflective film may or may not include PMMA, with or without PMMA being selected depending on the particular type of fluorocarbon resin employed. When PMMA is included in the black reflective film, the content of PMMA is smaller than the content of fluorocarbon resin. It should be noted that, the specific type or the addition amount of the polymethyl methacrylate in the embodiment of the present invention is not particularly limited, and may be adjusted and controlled by those skilled in the art according to actual situations, for example, may be optionally added or not added according to actual application scenarios or product requirements.

In order to make fluorocarbon resin better cooperate with black reflective filler and rutile titanium white, according to the concrete type of fluorocarbon resin adopted, the fluorocarbon resin may need to be modified, and by adding PMMA, the fluorocarbon resin can be modified, so that the fluorocarbon resin, the black reflective filler and the rutile titanium white can be better cooperate. And when the fluorocarbon resin adopted does not need to be modified, PMMA can not be added into the black reflective film.

In some embodiments, the fluorocarbon resin includes, but is not limited to, any one or more of polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF), or ethylene-tetrafluoroethylene copolymer (ETFE). The mixture may be a mixture of two fluorocarbon resins, for example, a mixture of PVF and PVDF, a mixture of PVF and ETFE, a mixture of ETFE and PVDF, or a mixture of three fluorocarbon resins, such as ETFE, PVDF, and PVF, etc.

In addition, in other implementations, fluorocarbon resins may also be used with other types of fluorocarbon materials, which are not limited in this embodiment of the present invention.

To further improve the performance of the black retroreflective film, the black retroreflective film may also include other ingredients to improve the performance desired or required for any particular application. Illustratively, in some embodiments, the black retroreflective film may further include an auxiliary agent that includes at least an ultraviolet absorber and/or a matting agent, e.g., the auxiliary agent includes an ultraviolet absorber, or includes a matting agent, or includes an ultraviolet absorber and a matting agent. The ultraviolet absorber and the matting agent can be of specific types commonly used in the field, and the specific types of the ultraviolet absorber and the matting agent are not limited in the embodiment of the invention.

In addition, in other implementations, the adjuvants may also include optional dispersants, wetting agents, leveling agents, defoamers, and the like.

The black retroreflective film includes optional additives, that is, the black retroreflective film may or may not include additives, and when the black retroreflective film includes additives, the content of additives is small. The added small amount of auxiliary agent can play roles in absorbing ultraviolet rays, extinction and the like.

Further, in some embodiments, the black reflective film comprises the following components in parts by mass:

It is to be noted that, herein, unless otherwise indicated, percentages, ratios, parts, or the like are by mass. Wherein the percentages stated in the present invention (including mass percent) are all based on the total mass of the composition. "parts by mass" refers to the basic unit of measurement of the mass ratio of the components, and 1 part may represent any unit mass, for example, 1 part may represent 1g, 2g, 5g, or the like.

In the black light-reflecting film, the mass part of the fluorocarbon resin is 60 to 70 parts, and typically, but not limited to, for example, 60 parts, 61 parts, 62, 63, 64 parts, 65, 66 parts, 67 parts, 68 parts, 69 parts, 70 parts, and any value in the range of any two of these values may be used. The black reflective filler is typically, but not limited to, 5 to 10 parts by mass, and may be, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, and any value in the range of any two of these values. The carbon black is typically, but not limited to, 0 to 1 part by mass, and may be, for example, 0 part, 0.2 part, 0.5 part, 0.8 part, 1 part, and any value in the range consisting of any two of these values. The mass part of the rutile titanium dioxide is 1 to 3 parts, and is typical but not limiting, for example, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts and any value in a range formed by any two of the point values. The PMMA is typically, but not limited to, 0 to 20 parts by mass, and may be, for example, any of the ranges consisting of 0 parts, 2 parts, 5 parts, 8 parts, 9 parts, 10 parts, 12 parts, 15 parts, 16 parts, 18 parts, 20 parts, and any two of these values. The UV absorber and/or matting agent is present in an amount of 0 to 5 parts by mass, and may be, for example, typically but not limited to, any of the values in the range of 0 parts, 1 part, 1.5 parts, 2 parts, 3 parts, 3.5 parts, 4 parts, 5 parts, and any two of these values.

In the embodiment of the invention, the black reflective film is synergistic with other raw materials by adjusting the types and the proportions of the components, particularly the black reflective filler, and the prepared packaging material has good reflectivity and power generation efficiency by enabling the components to be in the range, so that the power of the component is improved.

Further, in some embodiments, the black reflective film comprises the following components in parts by mass: 60-70 parts of fluorocarbon resin, 5-10 parts of black reflective filler, 0.5-1 part of carbon black, 1-3 parts of rutile titanium dioxide, 10-20 parts of polymethyl methacrylate and 0.5-5 parts of ultraviolet absorber and/or matting agent.

The synergistic interaction between the components is fully exerted by reasonably adjusting and optimizing the dosage of each component in the black reflective film, the processing performance, the light utilization rate, the aging resistance and other performances of the material are further improved, the light receiving loss of the component is reduced, the power of the component is improved, the product quality is improved, and the black reflective film has good economic benefit.

In some embodiments, the black retroreflective film may have a thickness of 10 μm to 100 μm, further 15 μm to 100 μm, further 20 μm to 90 μm, further 30 μm to 80 μm, and typically but not limited to, for example, any of the range of 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 40 μm, 50 μm, 60 μm, 80 μm, 90 μm, 100 μm, and any two of these dot values. In the range, the cost is reduced on the basis of ensuring the application performance of the material, namely, on the basis of ensuring the application performance such as the full black effect, the light reflection performance and the like; if the thickness is too small, the process is difficult to realize, and if the thickness is too large, the application performance is not obviously increased, and the cost is increased.

Further, in some embodiments, the encapsulation material further includes an adhesive layer that is laminated with the black reflective film. The packaging material can be of a double-layer or laminated structure and comprises a black reflecting film and an adhesive layer arranged on at least one surface of the black reflecting film. For example, the encapsulation material may include a black reflective film and an adhesive layer laminated with the black reflective film. In addition, in other embodiments, the packaging material may further include two or more black reflective films or two or more adhesive layers, and the specific number of layers of the black reflective films and the adhesive layers may be adjusted according to practical situations, which will not be described in detail herein.

The packaging material can achieve the effects of aging resistance, high temperature resistance to component hot spots and no delamination through the superposition of the black reflective film and the adhesive layer.

Specifically, in some embodiments, the adhesive layer may be a thermosetting adhesive film, that is, the adhesive layer may be a thermosetting adhesive layer, and may adhere to the surfaces of glass, a back plate, a bus bar, and the like after heating; or the high-temperature hot-pressing can be stable without delamination, the bonding effect is good, and the connection is stable and reliable. The adhesive layer can be used for bonding the back plate, glass or bus bar and the like with the black reflective film into a whole.

In some embodiments, the adhesive layer may also employ polyurethane-based adhesives, acrylic-based adhesives, epoxy-based adhesives, and the like.

Specifically, in some embodiments, the thickness of the adhesive layer may be 20 μm to 110 μm, further may be 30 μm to 100 μm, further 40 μm to 90 μm, and typically but not limited to, for example, may be any of the range consisting of 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, and any two of these dot values.

The specific shape of the above-mentioned encapsulation material may be various types, and may be square, elongated, diamond, irregular, or the like, for example. The packaging material provided by the embodiment of the invention can be cut into different shapes according to actual requirements, and can be primarily adhered to the surface of the material after a certain temperature is given. Therefore, the requirements of different component models can be met, and the full black effect of the components can be manufactured by adhering the components to the areas such as the component and the bus bars.

The packaging material provided by the embodiment of the invention has wider applicability and can be applied to single glass, double glass and transparent backboard components. In particular, the encapsulation material is suitable for almost all single and double seal type components.

In some embodiments, the packaging material can be cut into different shapes according to actual requirements to form packaging films with double-layer structures, and the packaging films are adhered on the component string space, the sheet space, the bus bar and the component edge area, so that the light receiving loss of the component can be reduced while the full black effect is ensured.

In the embodiment of the invention, the preparation method of the encapsulation material may be a preparation method of an encapsulation material which is known in the art and can be used for a photovoltaic module. Illustratively, the encapsulation material may be obtained by: the black light-emitting film is prepared by uniformly mixing the raw materials in the black light-emitting film, stirring, melting, extruding and granulating, and then melting the obtained black particles at high temperature, and adopting a blow molding or casting method to prepare the black light-reflecting film (the specific preparation process of the black light-reflecting film can refer to the existing fluorocarbon film manufacturing process, for example). And then carrying out corona treatment on the obtained black reflective film, and spraying (or coating) or pressing an adhesive layer with a certain thickness on the surface of the black reflective film to obtain the packaging material.

In some embodiments, the encapsulant has a reflectance of 5% to 20%.

As shown in fig. 1 to 3, an embodiment of the present application further provides a photovoltaic module including the above encapsulant 1, a back sheet, and at least one set of battery strings 2 disposed between the back sheet and the encapsulant 1.

The packaging material 1 can be applied to a photovoltaic module and used for packaging the photovoltaic module. It can be appreciated by those skilled in the art that the photovoltaic module and the foregoing packaging material are based on the same inventive concept, and the features and advantages described above with respect to the packaging material are equally applicable to the photovoltaic module, and are not described herein again.

The specific structural type of the photovoltaic module may be varied. The photovoltaic module can be a half-sheet, a shingle, a double-sided, a double-glass and other types of photovoltaic modules. The cell string may be formed by splicing or stacking solar cells, and may or may not have a gap between cells when formed by splicing.

The photovoltaic module may include, for example, a back sheet, a first encapsulant, a battery string, a second encapsulant, and glass in that order from bottom to top. The first encapsulant may be an encapsulant as described above, and the encapsulant may be adjacent to or adhered to the back plate. The invention is not limited to the specific type or structure of other components in the photovoltaic module, such as the battery string, glass, back sheet, second encapsulant, etc.

In some embodiments, the photovoltaic module comprises a plurality of groups of cell strings 2, each group of cell strings 2 comprising a plurality of cell sheets 3, the cell strings 2 being interconnected by bus bars 5. The cell strings 2 are provided with a cell string pitch (abbreviated as string pitch 21), and the cell sheets 3 are provided with a cell sheet pitch (abbreviated as sheet pitch 31). The photovoltaic module further comprises an edge region, which may be a blank region, for example, a peripheral region surrounding the cell string, referred to as an edge blank region 4.

The encapsulant material 1 includes a first portion to correspond to the sheet pitch 31, may further include a second portion to correspond to the string pitch 21, may further include a third portion to correspond to the bus bar 5, and may further include a fourth portion to correspond to the edge margin area 4 of the photovoltaic module.

In the embodiment of the invention, the packaging material 1 can be stuck on the surface of the backboard (such as Bai Beiban) through an auxiliary hot roller, and corresponds to the cell string interval 21, the cell sheet interval 31 and the marginal blank area 4 of the component, and the packaging material 1 can also be stuck on the surface of the bus bar 5 through the auxiliary hot roller. Wherein the adhesive layer in the encapsulation material 1 is adhered to the surface of the back plate or the surface of the bus bar 5. Thus, the black reflective film in the packaging material is well adhered to the surface of the component after lamination of the component.

The photovoltaic module comprises the packaging material provided by the embodiment of the application, so that the power of the module can be improved. On one hand, the black reflective film in the packaging material can reflect part of infrared light to be reused by the component, so that the light receiving quantity of the photovoltaic component is increased, and the output power of the component is improved; on the other hand, the light transmitted through the cell can be reflected by the white back plate for reuse.

It will be appreciated that the width, length, etc. dimensions of the above-described encapsulant material may be determined based on the cell string spacing, sheet spacing, component edge margin, or bus bar dimensions. For example, the width of the encapsulation material may be compatible with the cell string spacing (e.g., may be the same or slightly less or slightly greater), and the length of the encapsulation material may be compatible with the cell string spacing; or the width of the encapsulation material may be adapted to the cell pitch, the length of the encapsulation material may be adapted to the cell pitch, etc.

In addition, on the transparent backboard and glass, the packaging material containing the black reflective film can be adhered to the blank area of the component except the battery piece, so that the full black is ensured, and the reflective effect is realized.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

It is noted that a portion of this patent document contains material which is subject to copyright protection. The copyright owner has reserved copyright rights, except for making copies of patent documents or recorded patent document content of the patent office.

Claims

1. The packaging material is characterized by comprising a black reflective film, wherein the black reflective film comprises 60-70 parts of fluorocarbon resin, 0.5-1 part of carbon black, 5-10 parts of black reflective filler and 1-3 parts of rutile titanium dioxide;

Wherein the black reflective filler comprises at least one of copper chrome black, iron oxide black or chrome iron black;

The thickness of the black reflective film is 50-100 mu m.

2. The encapsulant of claim 1, wherein the black reflective film further comprises polymethyl methacrylate.

3. The encapsulant of claim 1, wherein the black light reflecting film further comprises an auxiliary agent, wherein the auxiliary agent comprises at least an ultraviolet absorber and/or a matting agent.

4. The packaging material according to any one of claims 1 to 3, wherein the black light reflecting film further comprises the following components in parts by mass:

0-20 parts of polymethyl methacrylate, and 0-5 parts of ultraviolet absorber and/or delustrant.

5. The packaging material according to claim 4, wherein the black light reflecting film comprises the following components in parts by mass:

10-20 parts of polymethyl methacrylate and 0.5-5 parts of ultraviolet absorber and/or delustrant.

6. A packaging material according to any one of claims 1-3, further comprising an adhesive layer, the adhesive layer being laminated with the black reflective film.

7. The encapsulating material of claim 6 wherein the adhesive layer has a thickness of 20 μm to 110 μm.

8. A photovoltaic module comprising the encapsulant of any one of claims 1-7, a backsheet, and at least one set of strings disposed between the backsheet and the encapsulant.

9. The photovoltaic module of claim 8, wherein at least one set of the cell strings comprises a plurality of cells, the cell strings being interconnected by bus bars;

Or the encapsulation material has a third portion to correspond to the bus bar;