Solar cell module

Abstract

The application relates to the technical field of solar cells, in particular to a solar cell module. The solar cell module provided by the application comprises a first encapsulation structure and a second encapsulation structure arranged oppositely; a plurality of solar cell strings arranged side by side are located between the first encapsulation structure and the second encapsulation structure, each solar cell string comprises a plurality of solar cell pieces connected in series; and a buffer layer is filled between any solar cell piece and the solar cell pieces adjacent to the solar cell piece, and between the solar cell piece and any of the first encapsulation structure or the second encapsulation structure. The solar cell module manufactured by the manufacturing method of the solar cell module provided by the application can solve the problem that collision between adjacent solar cell strings causes corner defects or hidden cracks.

Description

Technical Field

[0001] This application relates to the field of solar cell technology, specifically to a solar cell module. Background Technology

[0002] A solar cell module consists of multiple parallel strings of solar cells composed of multiple solar cells. Gaps may exist between the solar cells and between the strings of solar cells. When a light source shines on the photovoltaic module from the first source, some light will pass through the gaps between the cells or strings of the cell array (composed of solar cell strings) and be projected onto the second glass or transparent backsheet, causing this part of the light to pass through the second source and not be utilized.

[0003] In pursuit of higher power modules, small-gap technology is gaining increasing importance, with the gaps between adjacent solar cell strings being designed to be smaller and smaller to fully utilize the light source. However, improper process monitoring before or during lamination, such as human error or equipment vibration during transportation, can cause collisions between adjacent solar cell strings or adjacent solar cells, resulting in chipped corners or microcracks and damaging the product. Utility Model Content

[0004] Therefore, this application provides a method for manufacturing a solar cell module and a solar cell module to solve the problem that collisions between adjacent cell strings can easily lead to missing corners or microcracks.

[0005] This application provides a method for manufacturing a solar cell module, comprising the following steps: forming a first encapsulation structure; arranging a plurality of first solar cell strings side-by-side at intervals on the surface of the first encapsulation structure; forming a second encapsulation structure; arranging a plurality of second solar cell strings side-by-side at intervals on the surface of the second encapsulation structure; the interval between any two adjacent first solar cell strings is greater than the width of the second solar cell strings; the interval between any two adjacent second solar cell strings is greater than the width of the first solar cell strings; aligning the side of the first encapsulation structure with the first solar cell strings with the side of the second encapsulation structure with the second solar cell strings, and staggering the first and second solar cell strings; providing a buffer layer between the first encapsulation structure and the second encapsulation structure; and laminating the first encapsulation structure with the first solar cell strings and the second encapsulation structure with the second solar cell strings to form a solar cell module; wherein each first solar cell string and each second solar cell string includes a plurality of solar cell buffer layers connected in series, which are formed at least between any solar cell after lamination and its adjacent solar cell, and between the buffer layer and either the first or second encapsulation structure.

[0006] Optionally, the buffer layer includes a first buffer layer, a second buffer layer, and a third buffer layer; the first buffer layer is formed on the side surface of the second solar cell string facing the first encapsulation structure, the second buffer layer is formed on the side surface of the first solar cell string facing the second encapsulation structure, and the third buffer layer is formed between adjacent first and second solar cell strings; the third buffer layer is connected to the first and second buffer layers respectively.

[0007] Optionally, the step of setting a buffer layer between the first encapsulation structure and the second encapsulation structure includes: providing a buffer film and placing the buffer film between the opposing first encapsulation structure and the second encapsulation structure; the projected area of ​​the buffer film is larger than the projected area of ​​the corresponding regions of the first encapsulation structure and the second encapsulation structure; during the process of laminating the first encapsulation structure and the second encapsulation structure relative to each other, the first encapsulation structure and the second encapsulation structure are relatively close to each other and the first solar cell string and the second solar cell string are staggered and formed in the same layer, the portion of the buffer film on the side surface facing the first encapsulation structure forms a first buffer layer, the portion of the buffer film on the other side surface facing the second encapsulation structure forms a second buffer layer, and the portion of the buffer film between adjacent first solar cell strings and second solar cells forms a third buffer layer, and the first buffer layer, the second buffer layer and the third buffer layer are integrally formed structures.

[0008] Optionally, the step of forming the first encapsulation structure includes: providing a first cover glass; forming a first encapsulating adhesive layer on the surface of the first cover glass; and after the first encapsulation structure is formed, disposing a first solar cell string on the surface of the first encapsulating adhesive layer facing away from the first cover glass. The step of forming the second encapsulation structure includes: providing a second cover glass; forming a second encapsulating adhesive layer on the surface of the second cover glass; and after the second encapsulation structure is formed, disposing a second solar cell string on the surface of the second encapsulating adhesive layer facing away from the second cover glass.

[0009] Optionally, the buffer layer is a transparent film layer; with one side of the first encapsulation structure as the light-receiving surface, the method further includes the step of forming a reflective layer between at least the third buffer layer and the second cover glass; or, with one side of the second encapsulation structure as the light-receiving surface, the method further includes the step of forming a reflective layer between at least the third buffer layer and the first cover glass.

[0010] Optionally, one side of the first encapsulation structure is set as the light-receiving surface, and the reflective layer is formed between the third buffer layer and the second encapsulation adhesive layer; or, one side of the second encapsulation structure is set as the light-receiving surface, and the reflective layer is formed between the third buffer layer and the first encapsulation adhesive layer.

[0011] Optionally, the method for manufacturing a solar cell module further includes the following steps: providing a reflective coating on one side surface of the buffer film at the interface between the portion where the third buffer layer will be formed and the portion where the first buffer layer will be formed; or, providing a reflective coating at the interface between the portion where the third buffer layer will be formed and the portion where the first buffer layer will be formed; so that after the first encapsulation structure and the second encapsulation structure are laminated, the reflective coating is positioned accordingly to form a reflective layer. The reflective coating is an organic material coating with light-reflecting capabilities.

[0012] Optionally, one side of the first encapsulation structure is set as the light-receiving surface, and a reflective layer is formed and fully covers the surface of the second cover glass facing the solar cell string; or, one side of the second encapsulation structure is set as the light-receiving surface, and a reflective layer is formed and fully covers the surface of the first cover glass facing the solar cell string.

[0013] Optionally, the method for manufacturing a solar cell module further includes the following steps: forming a reflective layer covering the surface of the second cover glass on the side facing the solar cell string; or forming a reflective layer covering the surface of the first cover glass on the side facing the solar cell string.

[0014] This application also provides a solar cell module, including: a first encapsulation structure and a second encapsulation structure disposed opposite to each other; a plurality of solar cell strings arranged in parallel between the first encapsulation structure and the second encapsulation structure, each solar cell string including a plurality of solar cells connected in series; wherein, any solar cell is filled with a buffer layer between its adjacent solar cells and between itself and either the first encapsulation structure or the second encapsulation structure.

[0015] Optionally, the buffer layer includes a first buffer layer, a second buffer layer, and a third buffer layer; for any two adjacent solar cell strings, the first buffer layer is located on one side surface of the solar cell string facing the first encapsulation structure, the second buffer layer is located on one side surface of the other solar cell string facing the second encapsulation structure, and the third buffer layer is located between the two adjacent solar cell strings; both the first and second buffer layers are connected to the third buffer layer.

[0016] Optionally, the first buffer layer, the second buffer layer, and the third buffer layer are integrally molded structures.

[0017] Optionally, the first encapsulation structure includes a first cover glass and a first encapsulating adhesive layer, the first encapsulating adhesive layer being located between the first cover glass and the solar cell string; the second encapsulation structure includes a second cover glass and a second encapsulating adhesive layer, the second encapsulating adhesive layer being located between the second cover glass and the solar cell string.

[0018] Optionally, the buffer layer may also include a fourth buffer layer, which is located between any adjacent solar cells in the first or second solar cell string.

[0019] Optionally, the buffer layer is a transparent film layer; the solar cell module also includes a reflective layer; the light-receiving surface is set on one side of the first encapsulation structure, and the reflective layer is set to be located at least between the third buffer layer and the second cover glass; or, the light-receiving surface is set on one side of the second encapsulation structure, and the reflective layer is set to be located at least between the third buffer layer and the first cover glass.

[0020] Optionally, one side of the first encapsulation structure is set as the light-receiving surface, and the reflective layer is set between the third buffer layer and the second encapsulation adhesive layer; or, one side of the second encapsulation structure is set as the light-receiving surface, and the reflective layer is set between the third buffer layer and the first encapsulation adhesive layer.

[0021] Optionally, one side of the first encapsulation structure is set as the light-receiving surface, and the reflective layer is set to fully cover the surface of the second cover glass facing the solar cell string; or, one side of the second encapsulation structure is set as the light-receiving surface, and the reflective layer is set to fully cover the surface of the first cover glass facing the solar cell string.

[0022] Optionally, the buffer layer is a cross-linked ethylene-vinyl acetate copolymer film or a cross-linked polyethylene octene elastomer film.

[0023] Optionally, the thickness of the first buffer layer is 0.2μm-0.6μm; the thickness of the second buffer layer is 0.2μm-0.6μm; the width of the third buffer layer is 0.2μm-0.5μm; the light transmittance of the buffer layer is 85%-95%; and the thickness of the reflective layer is 2μm-15μm.

[0024] The beneficial effects of this application are as follows: The solar cell module manufacturing method of this application manufactures a solar cell module in which a buffer layer is filled between each solar cell and adjacent solar cells, and between each solar cell and either the first encapsulation structure or the second encapsulation structure. This buffer layer can act as a buffer when adjacent solar cells approach or collide with each other, thereby preventing corner breakage or microcracks.

[0025] Furthermore, in the solar cell module manufacturing method of this application, the buffer layer can be a transparent layer, with the first encapsulation structure side as the light-receiving side. Simultaneously, a reflective layer disposed between the third buffer layer and the second cover glass allows light passing through the third buffer layer—that is, light passing through the gaps between the solar cells—to be reflected back to the solar cells, thereby utilizing this portion of light and improving the performance of the solar cell module. When the second encapsulation structure side is the light-receiving side, the corresponding reflective layer disposed between the third buffer layer and the first cover glass also allows light passing through the third buffer layer—that is, light passing through the gaps between the solar cells—to be reflected back to the solar cells, thereby utilizing this portion of light and improving the performance of the solar cell module.

[0026] The solar cell module provided in this application has a buffer layer between each solar cell and adjacent solar cells, as well as between each solar cell and either the first encapsulation structure or the second encapsulation structure. This buffer layer can act as a buffer when adjacent solar cells approach or collide with each other, thereby preventing corner breakage or microcracks.

[0027] Furthermore, by making the buffer layer transparent, with the first encapsulation structure side as the light-receiving side, and simultaneously using a reflective layer positioned between the third buffer layer and the second cover glass, light passing through the third buffer layer—that is, light passing through the gaps between the solar cells—can be reflected back to the solar cells by the reflective layer, thereby utilizing this portion of light and improving the performance of the solar cell module. Similarly, when the second encapsulation structure side is the light-receiving side, the reflective layer positioned between the third buffer layer and the first cover glass also allows light passing through the third buffer layer—that is, light passing through the gaps between the solar cells—to be reflected back to the solar cells by the reflective layer, thereby utilizing this portion of light and improving the performance of the solar cell module. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an existing solar cell module; Figure 2 This is a schematic diagram of one embodiment of the solar cell module of this application; Figure 3 for Figure 2A schematic diagram of the manufacturing process of a solar cell module; Figure 4 This is a schematic diagram of another embodiment of the solar cell module of this application; Figure 5 for Figure 4 A schematic diagram showing the state of a solar cell module during the manufacturing process; Figure 6 for Figure 4 A schematic diagram of the manufacturing process of a solar cell module; Figure 7 This is a schematic top view of the buffer layer in one embodiment of the solar cell module of this application; Figure 8 This is a top view schematic diagram of the buffer layer in another embodiment of the solar cell module of this application; Figure 9 This is a schematic diagram of another embodiment of the solar cell module of this application; Figure 10 for Figure 9 A schematic diagram showing the state of a solar cell module during the manufacturing process; Figure 11 for Figure 9 A schematic diagram of the manufacturing process of a solar cell module; Figure 12 This is a schematic diagram of another embodiment of the solar cell module of this application; Figure 13 for Figure 12 A schematic diagram showing the state of a solar cell module during the manufacturing process; Figure 14 for Figure 12 A schematic diagram of the manufacturing process of solar cell modules.

[0030] Explanation of reference numerals in the attached figures: 100. Solar cell module; 110. Solar cell string; 120. First cover glass; 130. Second cover glass; 140. First encapsulating layer; 150. Second encapsulating layer; 200. Solar cell module; 210. Solar cell string; 211. Solar cell; 220. First cover glass; 230. Second cover glass; 240. First encapsulating layer; 250. Second encapsulating layer; 260. Buffer layer; 300. Solar cell module; 310. Solar cell string; 311. First solar cell string; 312. Second solar cell string; 320. First cover glass; 330. Second cover glass; 340. First encapsulating layer; 350. Second encapsulating layer; 360. Buffer film; 361. First buffer layer; 362. Second buffer layer; 363. Third buffer layer; 370. Reflective layer; 371. Reflective coating. Detailed Implementation

[0031] like Figure 1 As shown, a solar cell module 100 includes multiple solar cell strings 110 arranged side by side; it also includes a first cover glass 120 located on one side of the solar cell strings, a second cover glass 130 located on the other side of the solar cell strings, a first encapsulating layer 140 located between the solar cell strings 110 and the first cover glass 120, and a second encapsulating layer 150 located between the solar cell strings 110 and the second cover glass. A first gap A exists between adjacent solar cell strings 110. As described in the background section, to minimize incident light passing through the first gap A, the first gap A is designed to be increasingly narrow. Therefore, the risk of adjacent solar cell strings 110 colliding with each other during movement, transportation, and installation is increasing. Thus, a solution is needed to address the problem of corner damage or microcracks caused by collisions between adjacent solar cell strings 110.

[0032] This application provides a method for manufacturing a solar cell module, with reference to... Figure 3The process includes the following steps: S01: Forming a first encapsulation structure; arranging multiple first solar cell strings side-by-side at intervals on the surface of the first encapsulation structure, wherein the interval between any two adjacent first solar cell strings is greater than the width of the first solar cell string. S02: Forming a second encapsulation structure; arranging multiple second solar cell strings side-by-side at intervals on the surface of the second encapsulation structure; wherein the interval between any two adjacent second solar cell strings is greater than the width of the second solar cell string. S03: Positioning the side of the first encapsulation structure with the first solar cell strings opposite the side of the second encapsulation structure with the solar cell strings, and staggering the solar cell strings on the surface of the first encapsulation structure from the solar cell strings on the surface of the second encapsulation structure. S04: Providing a buffer layer between the first encapsulation structure and the second encapsulation structure. S05: Laminating the first encapsulation structure with the first solar cell strings and the second encapsulation structure with the second solar cell strings relative to each other to form a solar cell module. Each first solar cell string and each second solar cell string includes multiple solar cells connected in series. In the laminated solar cell module, the buffer layer is formed at least between any of the relative-laminated solar cells and between any of the solar cells and either the first or second encapsulation structure. The solar cell module manufacturing method of this application can solve the problem of missing corners or microcracks caused by collisions between adjacent cell strings.

[0033] This application also provides a solar cell module, comprising: a first encapsulation structure and a second encapsulation structure disposed opposite to each other; a plurality of solar cell strings arranged in parallel between the first encapsulation structure and the second encapsulation structure, each solar cell string comprising a plurality of solar cells connected in series; wherein, any solar cell is filled with a buffer layer between itself and its adjacent solar cells, and between itself and either the first encapsulation structure or the second encapsulation structure. The solar cell module of this application can solve the problem of corner chipping or microcracks caused by collisions between adjacent cell strings.

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] Example 1 refer to Figures 4-6 This embodiment provides a method for manufacturing a solar cell module, including the following steps: S011: Provide a first cover glass 320; form a first encapsulating adhesive layer 340 on the surface of the first cover glass 320 to form a first encapsulation structure; arrange a plurality of first solar cell strings 311 side by side at intervals on the surface of the first encapsulating adhesive layer 340 facing away from the surface of the first cover glass 320.

[0036] S021: Provide a second cover glass 330; form a second encapsulating adhesive layer 350 on the surface of the second cover glass 330 to form a second encapsulation structure; arrange a plurality of second solar cell strings 312 side by side at intervals on the surface of the second encapsulating adhesive layer 350 facing away from the surface of the first cover glass 320. Wherein, the interval between any two adjacent first solar cell strings 311 is greater than the width of the second solar cell string 312; and the interval between any two adjacent second solar cell strings 312 is greater than the width of the first solar cell string 311.

[0037] S03: The side of the first encapsulation structure with the first solar cell string 311 is opposite to the side of the second encapsulation structure with the second solar cell string 312, and the first solar cell string 311 and the second solar cell string 312 are offset from each other.

[0038] S041: Provide a buffer film 360, and place the buffer film 360 between the opposing first and second encapsulation structures. The projected area of ​​the buffer film 360 is larger than the projected area of ​​the corresponding regions of the first and second encapsulation structures.

[0039] S05: The first encapsulation structure and the second encapsulation structure are laminated together to form a solar cell module.

[0040] Thus, in the solar cell module formed after lamination, for any two adjacent solar cell strings, the portion of the buffer film 360 on the side surface facing the first encapsulation structure forms a first buffer layer 361, the portion of the buffer film 360 on the side surface facing the second encapsulation structure forms a second buffer layer 362, and the portion of the buffer film 360 between adjacent first and second solar cell strings forms a third buffer layer 363, and the first buffer layer 361, the second buffer layer 362, and the third buffer layer 363 are integrally formed structures.

[0041] In this way, before and during lamination preparation, the first solar cell string 311 on the surface of the first encapsulation structure and the second solar cell string 312 on the surface of the second encapsulation structure are separated by a buffer film 360. During lamination, the buffer film 360 melts and deforms, forming a buffer layer at least between any solar cell after lamination and its adjacent solar cells, and between any solar cell and either the first or second encapsulation structure. Thus, any solar cell is filled with a buffer layer between itself and its adjacent solar cells, and between itself and either the first or second encapsulation structure. This buffer layer can act as a buffer when adjacent solar cells approach or collide with each other, thereby preventing corner breakage or microcracks.

[0042] Furthermore, the buffer layer formed by the above manufacturing method not only includes a third buffer layer 363 located between adjacent solar cell strings 310, but also, for any adjacent solar cell strings 310, a first buffer layer 361 located between one solar cell string 310 and the first encapsulation structure, and a second buffer layer 362 located between another solar cell string 310 and the second encapsulation structure. The first buffer layer 361, the second buffer layer 362, and the third buffer layer 363 are connected as a single unit, or even integrally formed. This allows for the relatively simple formation of a third buffer layer 363 on the same layer as the solar cell strings 310 in the solar cell module, providing buffer protection for adjacent solar cell strings 310, with a simple and easy-to-implement process. Furthermore, the integrally formed buffer layer can more tightly encapsulate the solar cell strings 310, providing excellent encapsulation performance and effectively blocking water and oxygen erosion.

[0043] Example 2 refer to Figures 9-14 This embodiment provides a method for manufacturing a solar cell module. The difference from Embodiment 1 above is that the buffer film 360 is a transparent film layer; based on this, with one side of the first encapsulation structure set as the light-receiving surface, the method further includes the following steps: A reflective layer 370 is formed at least between the third buffer layer 363 and the second cover glass 330; or, with one side of the second encapsulation structure as the light-receiving surface, the method further includes the following steps: A reflective layer 370 is formed at least between the third buffer layer 363 and the first cover glass 320.

[0044] Thus, when the buffer film 360 is a transparent film layer, the first buffer layer 361, the second buffer layer 362, and the third buffer layer 363 are all transparent layers. Based on this, if one side of the first encapsulation structure is the light-receiving side, and the reflective layer 370 formed between the third buffer layer 363 and the second cover glass 330 allows light passing through the third buffer layer 363—that is, light passing through the gaps between the solar cells—to be reflected back to the solar cells by the reflective layer 370, thereby utilizing this portion of light and improving the performance of the solar cell module. Similarly, if one side of the second encapsulation structure is the light-receiving side, the reflective layer 370 formed between the third buffer layer 363 and the first cover glass 320 also allows light passing through the third buffer layer 363—that is, light passing through the gaps between the solar cells—to be reflected back to the solar cells by the reflective layer, thereby utilizing this portion of light and improving the performance of the solar cell module.

[0045] Furthermore, the above steps can be: With one side of the first encapsulation structure as the light-receiving surface, the reflective layer 370 is formed between the third buffer layer 363 and the second encapsulating adhesive layer 350; or, with one side of the second encapsulation structure as the light-receiving surface, the reflective layer 370 is formed between the third buffer layer 363 and the first encapsulating adhesive layer 340.

[0046] Specifically, taking the first packaging structure with one side as the light-receiving surface as an example, refer to... Figures 9-11 This includes the following steps: A01: On one side surface of the buffer film 360, a reflective coating 371 is provided at the junction of the portion where the third buffer layer 363 will be formed and the portion where the first buffer layer 361 will be formed; in some other embodiments, when the second encapsulation structure side is set as the light-receiving surface, a reflective coating 371 is provided at the junction of the portion where the third buffer layer will be formed and the portion where the second buffer layer will be formed.

[0047] In this way, after the first and second packaging structures are laminated, the reflective layer 370 can be naturally formed at the corresponding position of the reflective coating 371. The process is simple and easy to implement.

[0048] In addition, the above steps can also be: With one side of the first encapsulation structure as the light-receiving surface, a reflective layer 370 is formed and fully covers the surface of the second cover glass 330 facing the solar cell string 310. In some other embodiments, with one side of the second encapsulation structure as the light-receiving surface, a reflective layer 370 is formed and fully covers the surface of the first cover glass 320 facing the solar cell string 310.

[0049] Specifically, taking the first packaging structure with one side as the light-receiving surface as an example, refer to... Figures 12-14This includes the following steps: A02: A reflective layer 370 is formed on the surface of the second cover glass 330 facing the solar cell string 310, fully covering the surface of the second cover glass 330. In some other embodiments, the second encapsulation structure side is set as the light-receiving surface, and a reflective layer 370 is formed on the surface of the first cover glass 320 facing the solar cell string 310, fully covering the surface of the first cover glass 320.

[0050] Thus, after the first and second encapsulation structures are laminated, a reflective layer 370 can be formed between the third buffer layer 363 and the second cover glass 330 or the first cover glass 320. This allows light passing through the third buffer layer, i.e., light passing through the gaps between the solar cells, to be reflected back to the solar cells by the reflective layer, thereby utilizing this portion of light and improving the performance of the solar cell module. Furthermore, the process is simple and easy to implement. In addition, compared to the previous method, this method is simpler in process, and because it completely covers the surface of the second cover glass 330 or the first cover glass 320, the reflective layer area is larger, resulting in a higher utilization rate of reflected light passing through the gaps.

[0051] Example 3 refer to Figure 2 and Figure 7 , Figure 8 This embodiment provides a solar cell module 200, including: The first and second packaging structures are set relative to each other; Multiple solar cell strings 210 arranged in parallel between the first encapsulation structure and the second encapsulation structure, each solar cell string 210 comprising multiple solar cell cells 211 connected in series; The first encapsulation structure includes a first cover glass 220 and a first encapsulating adhesive layer 240 located between the first cover glass 220 and the solar cell string 210; The second encapsulation structure includes a second cover glass 230 and a second encapsulating adhesive layer 250 located between the second cover glass 230 and the solar cell string 210.

[0052] In this configuration, each solar cell string 210 is filled with a buffer layer 260 between adjacent solar cell strings 210 and between the buffer layer 260 and either the first or second encapsulation structure. The top view of the buffer layer 260 in the solar cell module 200 is as follows: Figure 7 As shown.

[0053] In this embodiment of the solar cell module, a buffer layer 260 is filled between each adjacent solar cell string 210. The first gap A is filled by the buffer layer 260, which can play a buffering role when adjacent solar cell strings 210 approach or collide with each other, thereby avoiding the occurrence of corner breakage or microcracks.

[0054] Furthermore, in some other embodiments, the top view of the buffer layer 260 is as follows: Figure 8 As shown, the buffer layer 260 includes a third buffer layer between any solar cell string 210 and its adjacent solar cell strings 210, and also includes a fourth buffer layer between any solar cell in any solar cell string and its adjacent solar cell. Thus, a buffer layer 260 is formed around each solar cell 211. Not only is a third buffer layer provided between solar cell strings, but a fourth buffer layer is also provided between any solar cell in a solar cell string. This allows a buffer layer 260 to be formed around each solar cell 211, thereby further achieving buffer protection for the solar cells in the solar cell string.

[0055] Specifically, the first buffer layer 260 includes a cross-linked ethylene-vinyl acetate copolymer (cross-linked EVA layer, where EVA is a general-purpose polymer with the molecular formula (C2H4)). x (C4H6O2) y The second buffer layer 270 can be made of the same material as the first buffer layer 260, or a cross-linked polyethylene octene copolymer elastomer (CLOSE, CAS No. 24937-78-8) membrane layer or a cross-linked polyethylene octene copolymer elastomer membrane layer (CLOSE is a novel polyolefin thermoplastic elastomer developed with metallocene catalyst, featuring narrow relative molecular mass distribution and narrow comonomer distribution, and controllable structure). The CLOSE or CLOSE membrane layer has good water and oxygen barrier properties.

[0056] The first encapsulating layer 240 and the second encapsulating layer 250 can be a polyethylene octene coelastomer film or an ethylene-vinyl acetate copolymer film.

[0057] The thickness of the first cover glass 320 can be 2.0mm-3.2mm, for example, 2.0mm, 2.4mm, 2.8mm, or 3.2mm. The thickness of the second cover glass 330 can be 2.0mm-3.2mm, for example, 2.0mm, 2.4mm, 2.8mm, or 3.2mm. The thickness of the first encapsulating layer 340 can be 0.3mm-1.2mm, for example, 0.3mm, 0.6mm, 0.9mm, or 1.2mm. The thickness of the second encapsulating layer 350 can be 0.3mm-1.2mm, for example, 0.3mm, 0.6mm, 0.9mm, or 1.2mm. The thickness of the solar cell 211 is 100μm-200μm, for example, 100μm, 150μm, or 200μm. The thickness of the first buffer layer is 0.2μm-0.6μm; the thickness of the second buffer layer is 0.2μm-0.6μm; the width of the third buffer layer is 0.2μm-0.6μm; the transmittance of the buffer layer is 85%-95%; and the thickness of the reflective layer is 2μm-15μm.

[0058] Example 4 refer to Figure 4 This embodiment provides a solar cell module 300, including: The first and second packaging structures are set relative to each other; Multiple solar cell strings 310 are arranged in parallel between the first encapsulation structure and the second encapsulation structure. Each solar cell string 310 includes multiple solar cells connected in series.

[0059] The first encapsulation structure includes a first cover glass 320 and a first encapsulating adhesive layer 340 located between the first cover glass 320 and the solar cell module; The second encapsulation structure includes a second cover glass 330 and a second encapsulating layer 350 located between the second cover glass 330 and the solar cell module.

[0060] In this embodiment, any solar cell string 310 is filled with a buffer layer between adjacent solar cell strings 310 and between itself and either the first encapsulation structure or the second encapsulation structure.

[0061] Furthermore, the buffer layer includes a first buffer layer 361, a second buffer layer 362, and a third buffer layer 363. In this embodiment, for any two adjacent solar cell strings 310, the first buffer layer 361 is located on the side surface of the solar cell string 310 facing the first encapsulation structure, the second buffer layer 362 is located on the side surface of the other solar cell string 310 facing the second encapsulation structure, and the third buffer layer 363 is located between the two adjacent solar cell strings. The first buffer layer 361 and the second buffer layer 362 are both connected to the third buffer layer 363. In this way, each first buffer layer 361 and each second buffer layer 362 are connected together through the third buffer layer 363, which can achieve multi-directional buffer protection for the solar cell string 310 and effectively block water and oxygen.

[0062] In some embodiments, the first buffer layer 361, the second buffer layer 362, and the third buffer layer 363 are integrally formed. The integral film encapsulation provides excellent performance and effectively blocks water and oxygen erosion. Furthermore, this allows for the use of the solar cell manufacturing method described in Embodiment 1 above, making the process simple and convenient.

[0063] Example 5 refer to Figure 9 and Figure 12 This embodiment provides a solar cell module 300. Based on embodiment 4, the buffer layer is a transparent film layer. The solar cell module 300 also includes a reflective layer 370. With the first encapsulation structure side as the light-receiving surface, the reflective layer 370 is located at least between the third buffer layer 363 and the second cover glass 330. Alternatively, with the second encapsulation structure side as the light-receiving surface, the reflective layer 370 is located at least between the third buffer layer 363 and the first cover glass 320.

[0064] When one side of the first encapsulation structure is set as the light-receiving surface, the light passing through the third buffer layer 363, i.e., passing through the first gap A between the solar cell strings 310 (reference), is allowed by the transparent buffer layer and the reflective layer 370 located at least between the third buffer layer 363 and the second cover glass 330. Figure 1 The light can be reflected back to the solar cell string 310 by the reflective layer 370, thereby enabling the utilization of this part of the light and improving the performance of the solar cell module 300.

[0065] Specifically, in this embodiment, reference is made to... Figure 9The reflective layer 370 can be directly disposed on the surface of the third buffer layer 363 facing the second cover glass 330, that is, the reflective layer 370 is disposed between the third buffer layer 363 and the second encapsulating adhesive layer 350. This allows the use of the solar cell module manufacturing method described in Embodiment 2 above, where the first buffer layer 361, the second buffer layer 362, the third buffer layer 363, and the reflective layer 370 can be integrally formed, saving process steps. For specific process steps, please refer to the relevant sections in Embodiment 2 above.

[0066] In some embodiments, the reflective layer is a highly reflective black coating, a white coating, or a colored coating. The highly reflective black coating may have a reflectivity of 55% or higher.

[0067] In some other embodiments, the second encapsulation structure side can also be configured as the light-receiving surface, with the reflective layer located at least between the third buffer layer 363 and the first cover glass 320. Correspondingly, when the second encapsulation structure side is configured as the light-receiving surface, the reflective layer 370 can be directly disposed on the surface of the third buffer layer 363 facing the first cover glass 320, i.e., the reflective layer 370 is disposed between the third buffer layer 363 and the first encapsulating adhesive layer 340. Through the transparent buffer layer and the reflective layer located at least between the third buffer layer 363 and the first cover glass 320, light passing through the third buffer layer 363, i.e., passing through the first gap A between the solar cell strings (see reference...), can be allowed to pass through... Figure 1 The light emitted can be reflected back to the solar cell string 310 by the reflective layer 370, thereby enabling the utilization of this light and improving the performance of the solar cell module.

[0068] refer to Figure 12 In some embodiments, with one side of the first encapsulation structure as the light-receiving surface, the reflective layer 370 of the solar cell module 300 can also completely cover the surface of the second cover glass 330 facing the solar cell string 310. That is, the reflective layer 370 is disposed between the second cover glass 330 and the second encapsulating adhesive layer 350. Thus, the reflective layer 370 can be formed by applying a reflective coating to the surface of the second cover glass 330 or to the surface of the second encapsulating adhesive layer 350 facing the second cover glass 330. This process is simple, convenient, and easy to implement. Furthermore, compared to the previous method, this method is simpler, and because it completely covers the surface of the second cover glass 330 or the first cover glass 320, the reflective layer area is larger, resulting in higher utilization of reflected light passing through the gap.

[0069] Similarly, in some other embodiments, the second encapsulation structure side is set as the light-receiving surface, and the reflective layer 370 can fully cover the surface of the first cover glass facing the solar cell module, that is, the reflective layer 370 is disposed between the second cover glass 330 and the second encapsulating adhesive layer 350.

[0070] The schemes of the present application have been disclosed as above by way of examples. Although the examples of the present application have been described with reference to the accompanying drawings, the skilled person can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A solar cell module, characterized in that, include: The first and second packaging structures are set relative to each other; Multiple solar cell strings arranged in parallel between the first encapsulation structure and the second encapsulation structure, each solar cell string comprising multiple solar cells connected in series; In this embodiment, a buffer layer is filled between any of the solar cells and between any of the solar cells adjacent to it and between it and either the first encapsulation structure or the second encapsulation structure.

2. The solar cell module according to claim 1, characterized in that, The buffer layer includes a first buffer layer, a second buffer layer, and a third buffer layer; For any two adjacent solar cell strings, the first buffer layer is located on one side surface of the solar cell string facing the first encapsulation structure, the second buffer layer is located on one side surface of the other solar cell string facing the second encapsulation structure, and the third buffer layer is located between the two adjacent solar cell strings; both the first buffer layer and the second buffer layer are connected to the third buffer layer.

3. The solar cell module according to claim 2, characterized in that, The first buffer layer, the second buffer layer, and the third buffer layer are integrally formed.

4. The solar cell module according to claim 2, characterized in that, The buffer layer further includes a fourth buffer layer, which is located between any adjacent solar cells in the first solar cell string or the second solar cell string.

5. The solar cell module according to claim 2, characterized in that, The first encapsulation structure includes a first cover glass and a first encapsulating adhesive layer, wherein the first encapsulating adhesive layer is located between the first cover glass and the solar cell string; The second encapsulation structure includes a second cover glass and a second encapsulating adhesive layer, the second encapsulating adhesive layer being located between the second cover glass and the solar cell string.

6. The solar cell module according to claim 5, characterized in that, The buffer layer is a transparent film layer; The solar cell module also includes a reflective layer; With one side of the first encapsulation structure set as the light-receiving surface, the reflective layer is positioned at least between the third buffer layer and the second cover glass; Alternatively, one side of the second encapsulation structure can be set as the light-receiving surface, and the reflective layer can be positioned at least between the third buffer layer and the first cover glass.

7. The solar cell module according to claim 6, characterized in that, With one side of the first encapsulation structure as the light-receiving surface, the reflective layer is positioned between the third buffer layer and the second encapsulating adhesive layer; or, With one side of the second encapsulation structure set as the light-receiving surface, the reflective layer is positioned between the third buffer layer and the first encapsulation adhesive layer.

8. The solar cell module according to claim 6, characterized in that, With one side of the first encapsulation structure as the light-receiving surface, the reflective layer is configured to fully cover the surface of the second cover glass facing the solar cell string; or... With one side of the second encapsulation structure as the light-receiving surface, the reflective layer is configured to fully cover the surface of the first cover glass facing the solar cell string.

9. The solar cell module according to any one of claims 1-8, characterized in that, The buffer layer is a cross-linked ethylene-vinyl acetate copolymer film or a cross-linked polyethylene octene co-elastomer film.

10. The solar cell module according to claim 6, characterized in that, The thickness of the first buffer layer is 0.2μm-0.6μm; The thickness of the second buffer layer is 0.2μm-0.6μm; The width of the third buffer layer is 0.2μm-0.5μm; The light transmittance of the buffer layer is 85%-95%; The thickness of the reflective layer is 2μm-15μm.

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