Packaging glass for optimizing edge light utilization and thin film assembly

Abstract

The utility model discloses packaging glass and a thin film assembly for optimizing edge light utilization, and the packaging glass comprises a glass body which is provided with a light-in surface and a light-out surface which are opposite to each other, and is provided with edge areas and a middle area which are located at the two sides; the reflection structure is used for reflecting incident light rays in the edge area to the middle area, and the reflection structure is arranged on the light emitting surface of the edge area; the reflecting layer is arranged on the light emitting surface of the edge area and is arranged in the circumferential direction of the glass body; and incident light in the edge area is reflected to the middle area through the reflection structure and the reflection layer. The thin film assembly comprises the packaging glass. After the packaging glass designed by the utility model is applied to the thin film assembly, the light utilization rate of the thin film assembly can be higher than that of a conventional thin film assembly by more than 3.0% under the same area, so that the light utilization rate and the power generation power of the assembly are obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic components, and specifically to a packaging glass and film component for optimizing edge light utilization. Background Art

[0002] At present, the key link in realizing the industrial application of perovskite photovoltaic cells lies in the packaging of the cells. The quality of the packaging performance will directly affect the overall output performance and stability of the photovoltaic modules.

[0003] However, in order to maintain the stability of the battery and prevent the external environment from damaging the battery, photovoltaic modules generally need to use butyl rubber to encapsulate the surrounding of the module (such as Figure 1 As shown), in order to reduce water vapor transmission, and in order to ensure a good water barrier effect around the component, the width of the butyl rubber is generally set wider (generally the width of the rubber is set at about 20mm, and it is a black material).

[0004] Therefore, the butyl rubber area of the photovoltaic module and the gap between the butyl rubber and the battery cannot be used to generate electricity, resulting in the sunlight shining in this area being wasted, making the light utilization rate of the module lower and the power generation capacity of the module reduced. Utility Model Content

[0005] The purpose of the utility model is to design a packaging glass and film component that optimizes edge light utilization to address the problems of the inability to utilize light in the butyl rubber area of existing photovoltaic components and in the gap between the butyl rubber and the battery, which leads to low light utilization rate of the component and reduced power generation power. By optimizing the problem of the inability to effectively utilize sunlight in the butyl rubber packaging area and in the gap between the butyl rubber and the battery, the optimal utilization rate of sunlight by the battery is achieved, thereby improving the power generation power of the component.

[0006] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0007] The utility model designs a packaging glass that optimizes edge light utilization, and the packaging glass comprises:

[0008] A glass body having a light incident surface and a light emitting surface opposite to each other, and having edge areas and a middle area on both sides;

[0009] a reflective structure, which is used to reflect the incident light in the edge area to the middle area, and the reflective structure is provided on the light emitting surface of the edge area;

[0010] and a reflective layer, which is arranged on the light-emitting surface of the edge area and on the circumference of the glass body; the incident light in the edge area is reflected to the middle area through the reflective structure and the reflective layer.

[0011] Furthermore, a packaging glass that optimizes edge light utilization: the reflective structure is set as an inclined plane A, and the angle between the inclined plane A and the light-emitting surface is α, and satisfies α≥β / 2, where β is the critical angle of total reflection of the packaging glass.

[0012] Furthermore, a packaging glass for optimizing edge light utilization is provided: the reflective structure is configured as a sawtooth structure, and the sawtooth structure is composed of a plurality of inclined surfaces B and a plurality of vertical surfaces perpendicular to the light emitting surface.

[0013] Furthermore, a packaging glass that optimizes edge light utilization: the angle between the inclined surface B and the light emitting surface is α, and satisfies α≥β / 2, where β is the critical angle of total reflection of the packaging glass.

[0014] Furthermore, in a packaging glass that optimizes edge light utilization, the reflectivity of the reflective layer is greater than 75%.

[0015] Furthermore, in a packaging glass that optimizes edge light utilization, the reflective layer is configured as a metal reflective layer or a reflective glaze layer.

[0016] The utility model also designs a film assembly for optimizing edge light utilization, which includes:

[0017] The above-mentioned encapsulation glass;

[0018] An encapsulating film is provided corresponding to the middle area of the encapsulating glass and is provided on the light emitting surface;

[0019] A transparent conductive layer is laminated on the packaging film;

[0020] a first charge transport layer, which is stacked on the transparent conductive layer;

[0021] a thin film battery layer, stacked on the first charge transport layer;

[0022] a second charge transport layer stacked on the thin film battery layer;

[0023] a back electrode layer stacked on the second charge transport layer;

[0024] a back glass on which the back electrode layer is stacked;

[0025] And butyl rubber, which is arranged between the packaging glass and the back glass at a position corresponding to the edge area, and is used to isolate water vapor outside the component to prevent it from entering the battery layer.

[0026] Furthermore, a thin film component for optimizing edge light utilization is provided: a gap is provided between the thin film battery layer and the butyl rubber, and the reflective layer corresponds to the gap.

[0027] The utility model is provided with at least one reflective structure on the inner side (light-emitting surface) of the glass corresponding to the butyl rubber area (edge area) through a glass integrated molding process. The cross-section of the reflective structure is a sloped structure or a sawtooth structure (composed of a sloped surface and a vertical surface), wherein the vertical surface is perpendicular to the thickness direction of the glass (i.e., perpendicular to the light-emitting surface), the outer walls of the sloped surface and the vertical surface are coated with a reflective layer, the angle α between the sloped surface and the light-emitting surface of the glass is ≥ β / 2, β is the critical angle for total reflection of the encapsulated glass, and a reflective layer is provided on the glass body corresponding to the gap between the butyl rubber and the battery.

[0028] Beneficial effects of the utility model:

[0029] (1) The present invention optimizes light utilization by providing a reflective structure and a reflective layer on the light-emitting surface of the glass corresponding to the butyl rubber area (edge area) in the component, and reflects the light that would have been wasted in the area to the middle area, thereby improving the light utilization and power generation efficiency of the component.

[0030] (2) The reflective structure on the encapsulated glass of the present invention is prepared by an integrated molding process, which is simple. At the same time, the reflective layer and the principle of total reflection of light in the glass are combined, so that the light irradiated on the butyl rubber area at the edge of the photovoltaic thin-film module and the area between the butyl rubber and the thin-film battery that cannot be used for power generation is reflected as much as possible into the power generation area (middle area) for power generation; after the encapsulated glass designed by the present invention is used for a thin-film module, the obtained thin-film module can have a light utilization rate that is more than 3.0% higher than that of a conventional thin-film module under the same area, thereby significantly improving the light utilization rate and power generation power of the module. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a schematic diagram of the structure of a conventional thin film module;

[0033] Figure 2 A schematic structural diagram of an encapsulated glass designed for optimizing edge light utilization according to Example 1 of the present utility model;

[0034] Figure 3 A schematic structural diagram of a thin film assembly designed for optimizing edge light utilization according to Example 2 of the present utility model;

[0035] Figure 4This is a schematic diagram of light reflection of the thin film assembly obtained in Example 2, which is also equivalent to the schematic diagram of light reflection of the encapsulating glass in Example 1;

[0036] Figure 5 A partial schematic diagram of an encapsulation glass designed for optimizing edge light utilization according to Example 3 of the present utility model.

[0037] Markings in the figure: 1-encapsulation glass, 2-encapsulation film, 3-transparent conductive layer, 4-first charge transport layer, 5-thin-film battery layer, 6-second charge transport layer, 7-back electrode layer, 8-back glass, 9-butyl glue, 11-glass body, 12-light incident surface, 13-light output surface, 14-edge area, 15-middle area, 16-reflection structure, 17-reflection layer, 161-slant B, 162-vertical surface. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating directions or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0040] Example 1

[0041] like Figure 2 As shown, in this embodiment 1, a packaging glass for optimizing edge light utilization is designed. The packaging glass 1 includes:

[0042] A glass body 11 having a light incident surface 12 and a light exit surface 13 opposite to each other, and the glass body 11 is composed of edge regions 14 on both sides and a middle region 15;

[0043] A reflective structure 16, which is configured as an inclined surface A and is disposed on the light-emitting surface 13 on the edge region 14. The reflective structure 16 reflects incident light in the edge region 14 to the middle region 15. The angle α between the inclined surface A and the light-emitting surface 13 satisfies α ≥ β / 2, where β is the critical angle for total internal reflection of the encapsulation glass 1.

[0044] And a reflective layer 17, which is configured as a metallic silver reflective layer with a reflectivity greater than 75%. The reflective layer 17 is arranged on the light-emitting surface 13 on the edge area 14 and on the circumference of the glass body 11; through the arrangement of the reflective structure 16 and the reflective layer 17, the incident light in the edge area 14 can be reflected to the middle area 15.

[0045] Example 2

[0046] This embodiment 2 provides a film assembly for optimizing the utilization of edge light. The structure of the film assembly is as follows: Figure 3 As shown, it includes:

[0047] The encapsulating glass 1 of Example 1;

[0048] The packaging film 2 is disposed corresponding to the middle area 15 of the packaging glass 1 and is disposed on the light emitting surface 13;

[0049] A transparent conductive layer 3 is laminated on the packaging film 2;

[0050] a first charge transport layer 4, which is stacked on the transparent conductive layer 3;

[0051] a thin film battery layer 5, which is stacked on the first charge transport layer 4;

[0052] A second charge transport layer 6, which is stacked on the thin film battery layer 5;

[0053] a back electrode layer 7, which is stacked on the second charge transport layer 6;

[0054] a back glass 8 on which the back electrode layer 7 is stacked;

[0055] And butyl rubber 9, which is arranged between the packaging glass and the back glass 8 at a position corresponding to the edge area 14, is used to isolate water vapor outside the component and prevent it from entering the battery layer.

[0056] According to the requirements of water vapor blocking and lamination, the thin-film component design of Example 2 leaves a certain gap between the butyl rubber 9 and the thin-film battery layer 5, and a reflective layer 17 is coated on the light-emitting surface 13 corresponding to this gap area, thereby forming diffuse reflection. The reflected light is reflected into the middle area 15 and absorbed by the thin-film battery layer 5, thereby improving the light utilization rate of the thin-film battery component and increasing the power generation capacity of the component.

[0057] Specifically, in the above-mentioned embodiment 1, the refractive index of the encapsulating glass 1 is 1.51, the critical angle β is 41°, and the angle α between the inclined surface A and the light-emitting surface 13 is β / 2=20.5°. After the incident light is incident, it will be reflected by the metallic silver reflective layer 17. According to the geometric relationship, the incident angle and the reflection angle of the silver layer surface are both α. When the reflected light reaches the surface of the encapsulating glass, the incident angle β is 2α, which is the total reflection angle β of the glass. Then, the light will be totally reflected. Figure 4 As shown, the reflected light enters the intermediate region 15 and is utilized.

[0058] Example 3

[0059] like Figure 5 As shown, in this embodiment 3, a packaging glass for optimizing edge light utilization is designed. The packaging glass 1 includes:

[0060] A glass body 11 having a light incident surface 12 and a light exit surface 13 opposite to each other, and the glass body 11 is composed of edge regions 14 on both sides and a middle region 15;

[0061] The reflective structure 16 is configured as a sawtooth structure, which is composed of a plurality of inclined surfaces B 161 and a plurality of vertical surfaces 162 perpendicular to the light emitting surface 13. The angle between the inclined surface B and the light emitting surface 13 is α, and satisfies α ≥ β / 2, where β is the critical angle for total reflection of the encapsulation glass 1. The sawtooth reflective structure 16 is provided on the light emitting surface 13 in the edge region 14, and the reflective structure 16 reflects incident light in the edge region 14 to the middle region 15.

[0062] And a reflective layer 17, which is configured as a reflective glaze layer 17 with a reflectivity greater than 75%. The reflective layer 17 is arranged on the light-emitting surface 13 on the edge area 14 and is arranged in the circumference of the glass body 11; through the arrangement of the reflective structure 16 and the reflective layer 17, the incident light in the edge area 14 can be reflected to the middle area 15.

[0063] Example 4

[0064] This embodiment 4 provides a thin film assembly that optimizes edge light utilization. The difference between this thin film assembly and the thin film assembly provided in embodiment 2 is that the thin film assembly of embodiment 4 uses the encapsulation glass provided in embodiment 3, and the rest is the same as embodiment 2.

[0065] When the encapsulated glass designed by the present invention is used to make a thin film module, the obtained thin film module can be more transparent than a conventional thin film module (such as Figure 1 The light utilization rate is higher by more than 3.0%, thereby significantly improving the power generation capacity of the component.

[0066] The above preferred embodiments of the present invention are only used to explain the present invention and are not intended to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A packaging glass for optimizing edge light utilization, characterized in that: The encapsulating glass (1) comprises: A glass body (11) having a light incident surface (12) and a light emitting surface (13) opposite to each other, and having edge areas (14) and a middle area (15) located on both sides; a reflective structure (16) for reflecting incident light in the edge region (14) to the middle region (15), wherein the reflective structure (16) is arranged on the light emitting surface (13) on the edge region (14); and a reflective layer (17) disposed on the light-emitting surface (13) of the edge region (14) and in the circumferential direction of the glass body (11); incident light in the edge region (14) is reflected to the middle region (15) through the reflective structure (16) and the reflective layer (17).

2. The packaging glass for optimizing edge light utilization according to claim 1, characterized in that: The reflective structure (16) is configured as an inclined plane A, and the angle between the inclined plane A and the light-emitting surface (13) is α, and satisfies α≥β / 2, where β is the critical angle for total reflection of the encapsulation glass.

3. The packaging glass for optimizing edge light utilization according to claim 1, characterized in that: The reflective structure (16) is configured as a sawtooth structure, and the sawtooth structure is composed of a plurality of inclined surfaces B (161) and a plurality of vertical surfaces (162) perpendicular to the light-emitting surface (13).

4. The packaging glass for optimizing edge light utilization according to claim 3, characterized in that: The included angle between the inclined surface B (161) and the light emitting surface (13) is α, and satisfies α≥β / 2, where β is the critical angle of total reflection of the encapsulation glass.

5. The packaging glass for optimizing edge light utilization according to claim 1, characterized in that: The reflectivity of the reflective layer (17) is greater than 75%.

6. The packaging glass for optimizing edge light utilization according to claim 1 or 5, characterized in that: The reflective layer (17) is configured as a metal reflective layer or a reflective glaze layer.

7. A thin film assembly for optimizing edge light utilization, characterized in that: The thin film assembly includes: The encapsulating glass (1) according to any one of claims 1 to 6; A packaging film (2) is arranged on the light emitting surface (13) corresponding to a middle area (15) of the packaging glass; A transparent conductive layer (3) is laminated on the packaging film (2); a first charge transport layer (4) stacked on the transparent conductive layer (3); a thin film battery layer (5) stacked on the first charge transport layer (4); a second charge transport layer (6) stacked on the thin film battery layer (5); a back electrode layer (7) stacked on the second charge transport layer (6); a back glass (8), on which the back electrode layer (7) is stacked; And butyl rubber (9), which is arranged between the packaging glass (1) and the back glass (8) at a position corresponding to the edge area (14) and is used to isolate water vapor outside the component and prevent it from entering the battery layer.

8. The thin film assembly for optimizing edge light utilization according to claim 7, characterized in that: There is a gap between the thin film battery layer (5) and the butyl rubber (9), and the reflective layer (17) corresponds to the gap.

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