Photovoltaic module

Abstract

The utility model relates to a photovoltaic module, in particular to an all-black type photovoltaic module. A welding strip between the cell strings is completely shielded by using a full-black adhesive film on the bottom surface of the existing cell string, so that the whole appearance of the photovoltaic module can present the same color and harmonious hue with the surface of the cell string.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of photovoltaic, especially relates to a kind of encapsulation adhesive film has the same color with battery string, and can be covered with adhesive film between battery string, the solder strip of battery string is electrically connected with each other, and the purpose of hiding any solder strip, to achieve the beauty of the overall color consistency. BACKGROUND

[0002] The rise of green energy is mainly because of the environmental pollution caused by the large use of petrochemical energy, and as the environmental pollution becomes more and more serious, people are looking for alternative energy power more and more; and because of the development of technology, the energy reserves become more and more scarce, so many people turn to focus on inexhaustible solar energy. Using solar energy not only does not cause any pollution to the environment, but also the energy generated after the completion of photovoltaic infrastructure using solar energy is completely free of any cost, so it soon becomes a kind of clean energy that everyone likes.

[0003] With the increase of installation number and the increase of coverage area, people see the whole piece of solar cell after the whole piece, because the coverage area is often the end of the eye, so in order to be beautiful, the overall appearance of photovoltaic assembly is required, in order to achieve the purpose of the whole piece of eye area is beautiful. The current photovoltaic assembly can be seen from the appearance after completing the overall structure, which is a large piece of silicon crystal battery string and a solder strip for electrically connecting each other. The current silicon chip battery string presents dark or dark blue on the appearance, and the solder strip for electrically connecting each other is made of silver (or other conductive material), so the overall appearance of the current photovoltaic assembly always exists in a piece of black with different colors in the form of strip. The mixed color situation will make the whole photovoltaic assembly very strange in integrity.

[0004] Therefore, the main purpose of the present application is to provide a photovoltaic assembly with consistent overall color, which can achieve the purpose of consistent color on the whole photovoltaic assembly by covering the solder strip with encapsulation adhesive film with the same color as the battery string. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to solve the problem of the prior art, and a photovoltaic assembly is provided, which comprises a first cover plate, a first adhesive film closely combined with the first cover plate, a battery string closely combined with the first adhesive film, a solder strip for electrically connecting each other, a second adhesive film for closely clamping the battery string in the middle, and a second cover plate closely combined with the second adhesive film, characterized by:

[0006] The first adhesive film has a first flowability on the side combined with the battery string, the second adhesive film has a second flowability on the side combined with the battery string, and there is a gradient between the first flowability and the second flowability;

[0007] The second adhesive film has a first part and a second part, the second part has a thickness greater than the thickness of the solder strip, the first part and the second part form the second adhesive film, and the second part can enter between the battery strings and cover the solder strip through the gradient between the first flowability and the second flowability.

[0008] One object of the present application is that one side of the battery string has a first color, and one side of the second adhesive film has a second color, the first color is the same as or has a color difference of 0.0-1.5 from the second color.

[0009] One object of the present application is that the second part of the second adhesive film contacts the first adhesive film.

[0010] One object of the present application is that the first part of the second adhesive film does not contact the first adhesive film.

[0011] One object of the present application is that the side of the first adhesive film in contact with the battery string has a plurality of continuous patterns to accommodate the second part of the second adhesive film.

[0012] One object of the present application is that the second adhesive film has at least one light-transmitting black film and one white film closely combined with the black film, the white film is in contact with the second cover plate and has a pre-crosslinking degree of 10-40%.

[0013] One object of the present application is that the side of the first adhesive film in contact with the battery string has a first pre-crosslinking degree, and the side of the second adhesive film in contact with the battery string has a second pre-crosslinking degree, and there is a gradient between the first pre-crosslinking degree and the second pre-crosslinking degree, so that the second flowability is greater than the first flowability, and thus the second part can flow between the battery strings and cover the solder strip.

[0014] One object of the present application is that the first adhesive film and the second adhesive film are selected from one of EVA, EPE or POE.

[0015] One object of the present application is that the side of the first adhesive film in contact with the battery string has a plurality of continuous patterns and has a first pre-crosslinking degree, and the first pre-crosslinking degree is 0-30%. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 :perspective view of the photovoltaic assembly of the present application.

[0017] Figure 2 :cross-sectional view of the photovoltaic assembly of the present application after being combined. DETAILED DESCRIPTION

[0018] The present application is further described, without limitation, by the following detailed description and drawings.

[0019] It is to be noted that some of the professional terms involved in the present application have the following specific meanings:

[0020] Cell string: the cell string refers to a long string of cells formed by welding strips;

[0021] Welding strip: refers to an element that electrically connects individual cells to each other.

[0022] Referring to Figure 1 , the present application provides a photovoltaic assembly, which comprises a first cover plate 10, a first adhesive film 20 tightly combined with the first cover plate 10, a cell string 30 tightly combined with the first adhesive film 20, welding strips 31 electrically connecting the cell strings to each other, a second adhesive film 40 tightly clamping the cell string 30 in the middle, and a second cover plate 50 tightly combined with the second adhesive film.

[0023] The first cover plate 10 and the second cover plate 50 are clamped between the cell string 30 by the first adhesive film 20 and the second adhesive film 40, as shown in Figure 2 As shown in the figure, after the cell string 30 is clamped between the first adhesive film 20 and the second adhesive film 40, it can be seen that the second adhesive film 40 forms a first part 41 and a second part 42 due to the addition of the cell string 30. The thickness of the second part 42 is greater than the thickness of the welding strip 31 and is not greater than (less than or equal to) the thickness of the cell string 30. The first part 41 and the second part 42 form the second adhesive film; here, the side of the first adhesive film 20 combined with the cell string 30 has a first flowability, the side of the second adhesive film 40 combined with the cell string 30 has a second flowability, and there is a gradient between the first flowability and the second flowability, that is, the second flowability is greater than the first flowability.

[0024] Since the thickness of the second part 42 is greater than the thickness of the welding strip 31, the second part 42 will enter the gap between the cell strings 30 by the factor of the second flowability and cover all exposed welding strips 31.

[0025] The first color of the first adhesive film 20 is the same as the second color of the second adhesive film 40. The first color and the second color are preferably dark black or dark blue. In the premise that the first color is the same as or has a color difference of 0.0-3 from the second color, the purpose of the present application of achieving the consistency of the overall photovoltaic assembly can be achieved. At the same time, although the thickness of the second part 42 is not greater than the thickness of the battery string 30, the first adhesive film 20 still tightly contacts the second part 42 of the second adhesive film 40 when the first adhesive film 20 is pressed against the battery string 30. In order to enable the first adhesive film 20 and the second part 42 of the second adhesive film 40 to be in close contact with each other, one side of the first adhesive film 20 has a plurality of continuous or discontinuous microstructures or patterns 21 to accommodate part of the second part 42 of the second adhesive film 40. Furthermore, since the first part 41 of the second adhesive film 40 is pressed by the battery string 30, the first part 41 of the second adhesive film 40 does not contact the first adhesive film 20.

[0026] Color difference refers to the difference in color perception between two samples, which includes three aspects of lightness difference, chroma difference and hue difference. Color difference refers to the difference value of two colors calculated by color difference formula after being measured by a color measuring instrument. The difference value between colors is represented by DE or ΔE. E is the first letter of the German word Empfindung (feeling); D is a Greek letter representing the difference in some aspects. DE represents the difference value between two colors. ΔE represents the distance difference between two color samples in the color space.

[0027] As the calculation unit of color difference, NBS was commonly used before. The relationship between NBS unit color difference value and vision is shown in the following table:

[0028]

[0029] Table 1

[0030] According to Table 1, in order to achieve the purpose of the present application, the color difference between the first color of the first adhesive film 20 and the second color of the second adhesive film 40 is preferably between 0.0 and 1.5.

[0031] In order to improve the light emitting efficiency of the battery string 30, the second adhesive film 40 can be composed of two layers. On the side in contact with the battery string 30, preferably, one layer can be a black film 43 having light transmission, and the other layer can be a white film 44 in contact with the second cover plate 50 and capable of enhancing reflection. Since the white film 44 is in contact with the second cover plate 50, the white film 44 has a certain degree of hardness, and thus the white film 44 can have a certain degree of pre-crosslinking, and the degree of pre-crosslinking is 10-40%. Further, since the black film 43 is required to cover the solder strip 31, the black film 43 does not have pre-crosslinking. In other words, if the second adhesive film 40 is composed of only one layer, the second adhesive film 40 has a degree of pre-crosslinking of 10-40% on the side in contact with the second cover plate 50, and does not have pre-crosslinking on the side in contact with the battery string 30 and the first adhesive film 20. Thus, it can be seen that there is a certain gradient between the degree of pre-crosslinking of the first adhesive film 20 on the side in contact with the battery string 30 and the degree of pre-crosslinking of the second adhesive film 40 on the side in contact with the battery string 30.

[0032] The preferred embodiments of the present application have been described above with reference to the drawings, but the present application is not limited to the above examples. It will be appreciated by those skilled in the art that various changes and modifications can be made to the present application without departing from the spirit and scope of the present application. Any modifications, equivalent replacements, improvements, and the like made within the spirit and principles of the present application should be included in the scope of the present application.

Claims

1. A photovoltaic module, comprising a first cover plate, a first encapsulant film closely combined with the first cover plate, a cell string closely combined with the first encapsulant film, a ribbon closely combined with the cell string, a second encapsulant film closely combined with the first encapsulant film and sandwiching the cell string therebetween, and a second cover plate closely combined with the second encapsulant film, wherein: a side of the first encapsulant film combined with the cell string has a first flowability, a side of the second encapsulant film combined with the cell string has a second flowability, and a gradient exists between the first flowability and the second flowability; the second encapsulant film has a first portion and a second portion, the second portion has a thickness greater than a thickness of the ribbon, and the first portion and the second portion together form the second encapsulant film, and the second portion can enter between the cell strings and cover the ribbon by the gradient between the first flowability and the second flowability; a side of the cell string has a first color, and a side of the second encapsulant film has a second color, the first color is the same as or has a color difference of 0.0-1.5 from the second color; the second portion of the second encapsulant film is in contact with the first encapsulant film; the first portion of the second encapsulant film is not in contact with the first encapsulant film; a side of the first encapsulant film combined with the cell string has a plurality of continuous patterns for accommodating the second portion of the second encapsulant film; the second encapsulant film has at least one light-transmitting black film and one white film closely combined with the black film, the white film is in contact with the second cover plate and has a degree of pre-crosslinking of 10-40%; a side of the first encapsulant film combined with the cell string has a first degree of pre-crosslinking, and a side of the second encapsulant film combined with the cell string has a second degree of pre-crosslinking, and a gradient exists between the first degree of pre-crosslinking and the second degree of pre-crosslinking, so that the second flowability is greater than the first flowability, and thus the second portion can flow between the cell strings and cover the ribbon; a side of the second encapsulant film combined with the second cover plate has a degree of pre-crosslinking, and the degree of pre-crosslinking is 10-40%, so that the second flowability is greater than the first flowability, and thus the second portion can flow between the cell strings and cover the ribbon; the first encapsulant film and the second encapsulant film are selected from one of EVA, EPE or POE; a side of the first encapsulant film combined with the cell string has a plurality of continuous patterns and has a first degree of pre-crosslinking, and the first degree of pre-crosslinking is 0-30%. ​ ​ 2. The photovoltaic module of claim 1, wherein ​ 3. The photovoltaic module of claim 1, wherein ​ 4. The photovoltaic module of claim 2, wherein ​ 5. The photovoltaic module of claims 1, 2, or 3, wherein ​ 6. The photovoltaic module of claim 2, wherein ​ 7. The photovoltaic module of claim 2, wherein ​ 8. The photovoltaic module of claim 5, wherein ​ 9. The photovoltaic module of claim 1, wherein ​ 10. The photovoltaic module of claim 5, wherein ​

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