Solar cell stack module

Abstract

We provide solar cell stacking modules. [Solution] The photovoltaic stack module includes a frame with a flange on its inner edge, a lower photovoltaic module installed within the frame and supported by its peripheral edge in direct contact with the flange, an upper photovoltaic module installed within the frame and stacked on top of the lower photovoltaic module, and an upper cover stacked on top of the upper photovoltaic module.

Description

TECHNICAL FIELD

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a novel photovoltaic cell laminated module that allows at least two photovoltaic cell modules to be fixedly mounted on the same frame structure. BACKGROUND ART

[0002] In recent years, with the development of photovoltaic technology, conversion efficiency and power have been continuously improved. Although scientists have devoted great efforts to the research of various materials and kept breaking through technical problems to achieve remarkable results, this means that various materials will reach their theoretical limits and fall into stagnation in the near future. In view of this, it is considered that the opportunity to further break through the theoretical limit of a single material lies in how to integrate the advantages of different materials, and tandem cells have gradually begun to receive attention.

[0003] In recent years, the tandem cells that have received relatively much attention are mainly those combining perovskite cells with silicon-based cells, wherein the conversion efficiency of perovskite cells is mainly in the short wavelength range, and that of silicon-based cells is mainly in the long wavelength range. The combined effect of the two can increase the efficiency of Tunnel Oxide Passivated Contact (TOPCon) cells from 24~26% to more than 30%. However, the currently relatively mature tandem cells still belong to 2T tandem cells, in which a perovskite cell is stacked on a conventional silicon-based cell through a semiconductor process, and the two are combined into a single cell.

[0004] However, perovskite cells are still under development, and their service life is much shorter than that of silicon-based cells. Therefore, after the two are combined, when the service life of the perovskite cell expires, it cannot be replaced later. Accordingly, another type of 4T cell technology has naturally emerged. The difference from 2T is that after the perovskite cell and the silicon-based cell are separately completed, the two cells are connected to form one battery pack, and at this time, when any one of the cells fails, it can be replaced immediately.

[0005] Current solar module installation methods only allow for single-module mounting, and regardless of the frame or support frame / pressure block design, only single-module mounting is considered. Therefore, in this field, there is still a need for frame designs that can simultaneously mount and lock two or more layers of modules in the same space. [Overview of the project] [Problems that the invention aims to solve]

[0006] The main objective of the present invention is to provide a novel 4T battery module and frame assembly that allows two modules to be fixedly mounted on the same frame structure. [Means for solving the problem]

[0007] One embodiment of the present invention provides a photovoltaic stack module, the photovoltaic stack module comprising: a frame having a flange on its inner edge; a lower photovoltaic module installed within the frame and supported by its periphery in direct contact with the flange; an upper photovoltaic module installed within the frame and stacked on top of the lower photovoltaic module; and an upper cover stacked on top of the upper photovoltaic module.

[0008] According to an embodiment of the present invention, the frame is a integrally molded frame.

[0009] According to an embodiment of the present invention, the frame is a modular frame and includes a pair of long-side rod-shaped structures and a pair of short-side rod-shaped structures.

[0010] According to embodiments of the present invention, the frame is made of a high-strength and corrosion-resistant metal or insulating material.

[0011] According to an embodiment of the present invention, the upper photovoltaic cell module is a light-transmitting cell module.

[0012] According to embodiments of the present invention, the light-transmitting battery module includes a perovskite battery module.

[0013] According to an embodiment of the present invention, the lower layer photovoltaic cell module is a silicon-based cell module.

[0014] According to embodiments of the present invention, the silicon-based battery module includes a TOPCon battery module, an HJT battery module, or an xBC battery module.

[0015] According to an embodiment of the present invention, the photovoltaic stack module further includes a buffer rubber strip installed between the upper photovoltaic module and the upper cover.

[0016] According to an embodiment of the present invention, the cushioning rubber strip is fixed to or fitted into the lower surface of the upper cover in advance.

[0017] According to an embodiment of the present invention, a buffer rubber strip is installed between the upper solar cell module and the upper cover, between the upper solar cell module and the lower solar cell module, or between the lower solar cell module and the flange. [Brief explanation of the drawing]

[0018] [Figure 1] This is a schematic side view of a photovoltaic stack module based on an embodiment of the present invention. [Figure 2] This is a schematic side view of a frame based on another embodiment of the present invention. [Figure 3] This is a schematic top view of a photovoltaic stack module based on another embodiment of the present invention. [Figure 4] This is a schematic cross-sectional view along the tangent line I-I' in Figure 3. [Figure 5] This is a schematic cross-sectional view along the tangent line II-II' in Figure 3. [Figure 6] This is a schematic top view of a photovoltaic stack module based on another embodiment of the present invention. [Figure 7] This is a schematic cross-sectional view taken along tangent line I-I' in Figure 6. [Figure 8] This is a schematic cross-sectional view taken along tangent line II-II' in Figure 6. [Description of Reference Numerals]

[0019] 1, 1a, 1b Solar cell laminated module 10 Frame 10a Long-side rod-shaped structure 10b Short-side rod-shaped structure 110 Flange 20 Lower-layer solar cell module 201 Bottom frame 30 Upper-layer solar cell module 40 Buffer rubber strip 42 Buffer rubber strip 44 Buffer rubber strip 50 Upper cover 50a Opening 60 Metal support frame FM Screw OP Central opening [Modes for Carrying Out the Invention]

[0020] Hereinafter, detailed description will be provided with reference to the drawings. The content in these drawings constitutes a part of the detailed description of the specification, and is presented as a specific example that enables the implementation of the present embodiment. In the following embodiments, sufficient details are explained to enable those skilled in the art to implement the embodiments specifically.

[0021] Naturally, other embodiments may be adopted, and any structural, logical and electrical changes may be made without departing from the embodiments described in the present specification. Therefore, the following detailed description is not intended to be limiting, and conversely, the embodiments included therein should be defined by the appended claims.

[0022] The present invention provides a novel 4T battery / module frame structure that allows two (or more) battery modules to be fixedly mounted on the same frame structure simultaneously, such as a stacked module that adds a TOPCon battery module to a perovskite battery module, which has recently attracted considerable attention.

[0023] The newly designed solar module frame structure allows for the simultaneous installation and locking of two or more layers of battery modules within the same frame space. For example, by combining a perovskite battery module located on the upper layer with a TOPCon battery module located on the lower layer, the conversion wavelengths, which are the advantages of each, can be matched to improve power generation efficiency. Furthermore, the newly designed solar module frame structure is convenient for future maintenance and replacement.

[0024] Figure 1 is a schematic side view of a photovoltaic stack module according to an embodiment of the present invention. As shown in Figure 1, the photovoltaic stack module 1 includes a frame 10, of which a flange 110 is provided on the inner edge of the bottom of the frame 10. According to an embodiment of the present invention, the frame 10 has a central opening OP for housing the photovoltaic module. According to an embodiment of the present invention, the frame 10 includes a pair of long-side rod-shaped structures 10a and a pair of short-side rod-shaped structures 10b.

[0025] According to an embodiment of the present invention, the photovoltaic stack module 1 further includes a lower photovoltaic module 20 installed in the central opening OP of the frame 10, and the peripheral edge of the bottom of the lower photovoltaic module 20 is supported by direct contact with the flange 110 of the frame 10. According to an embodiment of the present invention, for example, the lower photovoltaic module 20 may be a silicon-based photovoltaic module such as a tunnel oxide passivated contact (TOPCon) cell module, a heterojunction (HJT) cell module, or a forklift back contact (xBC) cell module.

[0026] According to an embodiment of the present invention, the photovoltaic stack module 1 further includes an upper photovoltaic module 30 that is installed in the central opening OP of the frame 10 and stacked on the lower photovoltaic module 20. According to an embodiment of the present invention, for example, the upper photovoltaic module 30 may be a light-transmitting, wide-bandgap (or super-wide-bandgap) battery module such as a perovskite solar cell module.

[0027] According to an embodiment of the present invention, the dimensions of the central opening OP are approximately equal to the dimensions of the lower solar cell module 20 and the upper solar cell module 30, so that the upper solar cell module 30 and the lower solar cell module 20 can be appropriately installed within the frame 10. According to an embodiment of the present invention, the upper solar cell module 30 and the lower solar cell module 20 may have the same dimensions, or they may have different dimensions, for example, arranged in a 1:2 or 1:3 ratio.

[0028] According to embodiments of the present invention, the upper solar cell module 30 and the lower solar cell module 20 may be frameless battery modules or framed battery modules.

[0029] According to an embodiment of the present invention, the photovoltaic stack module 1 further includes an annular upper cover 50 for securing the periphery of the upper photovoltaic module 30. According to an embodiment of the present invention, the annular upper cover 50 can be fixed to the frame 10 by fastening means such as screws FM. According to an embodiment of the present invention, the upper cover 50 is made of, for example, a high-strength and corrosion-resistant metal or insulating material, and also has an opening 50a whose size is similar to the central opening OP of the frame 10.

[0030] According to an embodiment of the present invention, a buffer rubber strip 40 may be separately installed between the upper solar cell module 30 and the upper cover 50 to avoid damage to the upper solar cell module 30 due to stress. According to an embodiment of the present invention, the buffer rubber strip 40 may be installed continuously or discontinuously. According to an embodiment of the present invention, the buffer rubber strip 40 can be fixed or fitted in advance to the lower surface of the upper cover 50.

[0031] According to embodiments of the present invention, the flange 110 of the frame 10 may be continuous or discontinuous, and its width is less than or equal to the inactive region around the lower photovoltaic module 20.

[0032] According to embodiments of the present invention, the frame 10 may be a integrally molded frame, but is not limited thereto. According to another embodiment of the present invention, the frame 10 may be a modular structure, for example, a pair of long-side rod-shaped structures 10a and a pair of short-side rod-shaped structures 10b may be disassembled into independent members for easier transport and installation.

[0033] According to embodiments of the present invention, the frame 10 is made of, for example, a high-strength and corrosion-resistant metal or insulating material. According to embodiments of the present invention, the frame 10 may be made of the same material as a general solar cell frame. According to embodiments of the present invention, the frame 10 can be made of a general C-shaped steel material, stainless steel, engineering plastic, or other corrosion-resistant insulating material. The design of the solar module frame structure of the present invention achieves the objective of increasing power by fixing an upper solar cell module 30 on top of a lower solar cell module 20 (for example, a TOPCon battery module) in a fixing method that satisfies the mounting requirements of a 4T module, while also solving the problem of the short lifespan and inability to immediately replace conventional perovskite battery modules.

[0034] Figure 2 is a schematic side view of a frame of another embodiment of the present invention, where the same or similar elements, layers, or materials are given the same reference numerals. As shown in Figure 2, the frame 10 is a composite structure, for example, a combination of a plurality of long-side rod-shaped structures 10a (four are illustrated in the figure) and a plurality of short-side rod-shaped structures 10b (six are illustrated in the figure), and has a plurality of central openings OP for housing photovoltaic modules (not shown). A flange 110 is installed on the inner edge of the bottom of the frame 10. According to an embodiment of the present invention, the frame 10 has a plurality of central openings OP (three are illustrated in the figure) for housing a plurality of photovoltaic modules.

[0035] In Figure 2, the two intermediate long-side rod-shaped structures 10a and the upper cover 50 may be shared, and the upper cover 50 may be strip-shaped rather than annular and fixed to the long-side rod-shaped structures 10a. Naturally, in another embodiment, the two intermediate long-side rod-shaped structures 10a do not have to be shared; for example, each long-side rod-shaped structure 10a in the figure may be divided into two and placed in parallel.

[0036] Referring to Figures 3 to 5, Figure 3 is a schematic top view of a photovoltaic stack module of another embodiment of the present invention, Figure 4 is a schematic cross-sectional view along tangent I-I' of Figure 3, and Figure 5 is a schematic cross-sectional view along tangent II-II' of Figure 3, with the same or similar elements, layers, or materials being denoted by the same reference numerals.

[0037] As shown in Figures 3 to 5, the photovoltaic stack module 1a includes a frame 10, of which a flange 110 is provided on the inner edge of the bottom of the frame 10. According to an embodiment of the present invention, the frame 10 has a central opening OP for housing the photovoltaic module. According to an embodiment of the present invention, the frame 10 is a modular structure and includes a pair of long-side rod-shaped structures 10a and a pair of short-side rod-shaped structures 10b that can be disassembled into independent members, making transportation and installation convenient.

[0038] According to embodiments of the present invention, the frame 10 is made of, for example, a high-strength and corrosion-resistant metal or insulating material. According to embodiments of the present invention, the frame 10 can be made of the same material as a typical solar cell frame. According to embodiments of the present invention, the frame 10 can be made of a corrosion-resistant insulating material such as a typical C-shaped steel material, stainless steel, or engineering plastic. According to embodiments of the present invention, the frame 10 can be locked to the metal support frame 60 using a method such as screws.

[0039] According to embodiments of the present invention, the photovoltaic stack module 1a further includes a lower photovoltaic module 20 installed in the central opening OP of the frame 10. According to embodiments of the present invention, the lower photovoltaic module 20 is a framed battery module, and its bottom frame 201 is supported in direct contact with the flange 110 of the frame 10. According to embodiments of the present invention, the flange 110 of the frame 10 may be continuous or discontinuous, and its width may be less than or equal to the inactive region around the lower photovoltaic module 20. According to embodiments of the present invention, for example, the lower photovoltaic module 20 may be a silicon-based photovoltaic module such as a TOPCon battery module, an HJT battery module, or an xBC battery module.

[0040] According to an embodiment of the present invention, the photovoltaic stack module 1a further includes an upper photovoltaic module 30 which is also installed in the central opening OP of the frame 10 and stacked on the lower photovoltaic module 20. According to an embodiment of the present invention, for example, the upper photovoltaic module 30 may be a translucent, wide-bandgap (or super-wide-bandgap) battery module such as a perovskite battery module. According to an embodiment of the present invention, a buffer rubber strip 42 may be selectively installed between the lower photovoltaic module 20 and the upper photovoltaic module 30.

[0041] According to an embodiment of the present invention, the dimensions of the central opening OP are approximately equal to the dimensions of the lower solar cell module 20 and the upper solar cell module 30, so that the upper solar cell module 30 and the lower solar cell module 20 can be appropriately installed within the frame 10. According to an embodiment of the present invention, the upper solar cell module 30 and the lower solar cell module 20 may have the same dimensions, or they may have different dimensions, for example, arranged in a 1:2 or 1:3 ratio.

[0042] According to an embodiment of the present invention, the photovoltaic stack module 1a further includes an upper cover 50, shown in Figure 1, to hold down the periphery of the upper photovoltaic module 30. For simplicity of explanation, the upper cover 50 is not shown in Figures 3 to 5.

[0043] Referring to Figures 6 to 8, Figure 6 is a schematic top view of a photovoltaic stack module of another embodiment of the present invention, Figure 7 is a schematic cross-sectional view along tangent I-I' of Figure 6, and Figure 8 is a schematic cross-sectional view along tangent II-II' of Figure 6, with the same or similar elements, layers, or materials being denoted by the same symbols.

[0044] As shown in Figures 6 to 8, the photovoltaic stack module 1b includes a frame 10, of which a flange 110 is installed on the inner edge of the bottom of the frame 10. According to an embodiment of the present invention, the frame 10 has a central opening OP for housing the photovoltaic module. According to an embodiment of the present invention, the frame 10 is a modular structure and includes a pair of long-side rod-shaped structures 10a and a pair of short-side rod-shaped structures 10b that can be disassembled into independent members, making transportation and installation convenient.

[0045] According to embodiments of the present invention, the frame 10 is made of, for example, a high-strength and corrosion-resistant metal or insulating material. According to embodiments of the present invention, the frame 10 can be made of the same material as a typical solar cell frame. According to embodiments of the present invention, the frame 10 can be made of a corrosion-resistant insulating material such as a common C-shaped steel material, stainless steel, or engineering plastic. According to embodiments of the present invention, the frame 10 can be locked to the metal support frame 60 using a method such as screws.

[0046] According to embodiments of the present invention, the photovoltaic stack module 1b further includes a lower photovoltaic module 20 installed in the central opening OP of the frame 10. According to embodiments of the present invention, the lower photovoltaic module 20 is a frameless battery module and is supported by a flange 110 of the frame 10. According to embodiments of the present invention, a buffer rubber strip 44 is installed between the flange 110 and the lower photovoltaic module 20. According to embodiments of the present invention, the flange 110 of the frame 10 may be continuous or discontinuous, and its width may be less than or equal to the inactive area around the lower photovoltaic module 20. According to embodiments of the present invention, for example, the lower photovoltaic module 20 may be a silicon-based photovoltaic module such as a TOPCon battery module, an HJT battery module, or an xBC battery module.

[0047] According to an embodiment of the present invention, the photovoltaic stack module 1b further includes an upper photovoltaic module 30 which is also installed in the central opening OP of the frame 10 and stacked on the lower photovoltaic module 20. According to an embodiment of the present invention, for example, the upper photovoltaic module 30 may be a translucent, wide-bandgap (or super-wide-bandgap) battery module such as a perovskite battery module. According to an embodiment of the present invention, a buffer rubber strip 42 can be selectively installed between the lower photovoltaic module 20 and the upper photovoltaic module 30.

[0048] According to an embodiment of the present invention, the dimensions of the central opening OP are approximately equal to the dimensions of the lower solar cell module 20 and the upper solar cell module 30, so that the upper solar cell module 30 and the lower solar cell module 20 can be appropriately installed within the frame 10. According to an embodiment of the present invention, the upper solar cell module 30 and the lower solar cell module 20 may have the same dimensions, or they may have different dimensions, for example, arranged in a 1:2 or 1:3 ratio.

[0049] According to an embodiment of the present invention, the photovoltaic stack module 1b further has an upper cover 50, shown in Figure 1, to hold down the periphery of the upper photovoltaic module 30. For simplicity of explanation, the upper cover 50 is not shown in Figures 6 to 8.

[0050] The above are relatively preferred embodiments of the present invention, and all equivalent modifications and alterations based on the claims of the present invention should be considered to fall within the scope of the present invention.

Claims

1. A stacked solar cell module, A frame with a flange on its inner edge, A lower-layer photovoltaic module is installed within the frame and supported by its peripheral edge in direct contact with the flange, An upper solar cell module is installed within the frame and stacked on top of the lower solar cell module, A photocell stack module, comprising an upper cover stacked on top of the upper layer photocell module.

2. The photovoltaic stack module according to claim 1, wherein the frame is a integrally molded frame.

3. The photovoltaic stacking module according to claim 1, wherein the frame is a modular frame and includes a pair of long-side rod-shaped structures and a pair of short-side rod-shaped structures.

4. The photovoltaic stack module according to claim 1, wherein the frame is made of a high-strength and corrosion-resistant metal or insulating material.

5. The photovoltaic stack module according to claim 1, wherein the upper layer photovoltaic module is a light-transmitting battery module.

6. The photovoltaic stack module according to claim 5, wherein the light-transmitting battery module includes a perovskite battery module.

7. The photocell stack module according to claim 1, wherein the lower layer photocell module is a silicon-based battery module.

8. The photovoltaic stack module according to claim 7, wherein the silicon-based battery module includes a TOPCon battery module, an HJT battery module, or an xBC battery module.

9. The photovoltaic stack module according to claim 1, further comprising a buffer rubber strip installed between the upper photovoltaic module and the upper cover.

10. The photovoltaic stack module according to claim 9, wherein the buffer rubber strip is fixed or fitted in advance to the lower surface of the upper cover.

11. The photovoltaic stack module according to claim 1, wherein a buffer rubber strip is installed between the upper photovoltaic module and the upper cover, between the upper photovoltaic module and the lower photovoltaic module, or between the lower photovoltaic module and the flange.

Images