Replaceable flexible photovoltaic assembly of old photovoltaic power station

Abstract

The utility model discloses a replaceable flexible photovoltaic assembly of an old photovoltaic power station, a battery piece is formed by arranging four battery strings on a transparent front plate in parallel, each battery string is formed by serially connecting 14 or 17 half battery pieces formed by cutting a 210mm * 210mm PERC rectangular battery piece, every two adjacent battery strings of the four battery strings are sequentially connected in series in a manner that the positions of positive and negative electrodes are arranged in opposite directions, and the positive and negative electrodes of the battery strings are arranged in opposite directions. The negative electrode of the first battery string is connected with the positive electrode of the second battery string, the positive electrode of the first battery string is connected with the negative electrode of the second battery string through a positive electrode lead-out wire, the positive electrode of the third battery string is connected with the negative electrode of the fourth battery string through a negative electrode lead-out wire, and the positive electrode lead-out wire and the negative electrode lead-out wire are respectively connected with a junction box. According to the replaceable flexible photovoltaic module, the outer side face of the reinforced rear plate is flatly laid and pasted on the front face of the old photovoltaic module for replacement, so that the requirements of replacement installation and compatibility are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the reconstruction of old photovoltaic power station, especially a novel photovoltaic module capable of replacing old photovoltaic modules. BACKGROUND

[0002] With the development of photovoltaic power station technology, the old photovoltaic power station mostly uses low-power photovoltaic modules of polycrystalline 156 battery pieces in the past, and the packaging materials and technology used are relatively backward. With the passage of time, the power attenuation, hidden cracks, material aging, PID and other abnormalities of the old photovoltaic module become more and more serious, resulting in a significant decline in power generation of the power station.

[0003] At present, the power of photovoltaic modules is basically dominated by high-efficiency large modules, and the module power, current, voltage and size are all improved synchronously. The current old photovoltaic power station mostly uses small-size modules. Such modules are small in size and low in efficiency, and with the development of the industry, such modules have been withdrawn from the market. When the power station replaces old modules, it cannot purchase modules consistent with the original module specifications. The size and electrical parameters of the modules on the market at present cannot effectively be compatible with old power stations.

[0004] At the same time, with the passage of time, some components of the old power station have rusted and aged installation position bolts or pressing blocks, making it difficult to disassemble the old modules. In addition, some old power stations have special installation characteristics, such as structural adhesive installation or building integrated application scenarios, which make it impossible to disassemble or disassemble at a huge cost.

[0005] Currently, some old power station installation fasteners have rusted and aged due to aging problems such as bolts and pressing blocks, making it difficult to disassemble the old modules. In addition, some old power stations have special installation methods, such as using structural adhesives or building integrated modules, which cannot be removed from the old modules, causing the power generation loss of the power station to continue to expand UTILITY MODEL CONTENTS

[0006] Utility model purpose: The utility model aims to provide a novel module capable of replacing old photovoltaic modules in old photovoltaic power stations, so as to meet the requirements of replacement installation and compatibility.

[0007] Technical solution: A kind of old photovoltaic power station replaceable flexible photovoltaic module, including cell piece, transparent front plate, busbar, positive lead-out wire, negative lead-out wire, reinforced back plate, junction box, cell piece is by 4 strings of battery parallelly arranged on the transparent front plate, each string of battery adopts 14 pieces or 17 pieces of half piece of cell piece cut from 210mm*210mm PERC rectangular cell piece and is connected in series, 4 strings of battery each adjacent two strings are arranged with positive and negative pole position reversal and are connected in series in turn, and the negative pole of the first string of battery is connected with the positive pole of the second string of battery, the positive pole between the first string of battery and the negative pole of the second string of battery is connected with the positive lead-out wire, the positive pole between the third string of battery and the negative pole of the fourth string of battery is connected with the negative lead-out wire, the positive lead-out wire and the negative lead-out wire are connected with one junction box respectively, and the replaceable flexible photovoltaic module is replaced with the outer side of the reinforced back plate flatly pasted on the front of old photovoltaic module.

[0008] Further, the positive lead-out wire and the negative lead-out wire are connected with the cell string from the hole in the transparent front plate.

[0009] Further, the component power of the replaceable flexible photovoltaic module is 290W, the component short-circuit current is 9.12A, the component open-circuit voltage is 38.92V, the component version size is 1565mm*920mm, and a total of 56 half pieces of cell piece, and the old photovoltaic module to be replaced is as follows: the component power is 250-295W, the component short-circuit current is 8.68-9.56A, the component open-circuit voltage is 37.7-39.5V, and the component version size is 1640-1650mm*990-992mm.

[0010] Further, the component power of the replaceable flexible photovoltaic module is 350W, the component short-circuit current is 9.12A, the component open-circuit voltage is 47.26V, the component version size is 1883mm*920mm, and a total of 68 half pieces of cell piece, and the old photovoltaic module to be replaced is as follows: the component power is 295-335W, the component short-circuit current is 8.72-9.41A, the component open-circuit voltage is 45.1-46.4V, and the component version size is 1957-1968mm*990-992mm.

[0011] Further, the replaceable flexible photovoltaic module is flatly pasted on the front of the old photovoltaic module on the outer side of the reinforced back plate by structural adhesive and foam tape.

[0012] Beneficial effect: The replaceable flexible photovoltaic module can replace the old photovoltaic module of the old power station one by one, the old photovoltaic module does not need to be disassembled, the installation steps are simple, only need to be pasted and fixed, and the replaceable flexible photovoltaic module itself is light, only about 2.8kg / m 2For older brackets or special installation scenarios such as building roofs with relatively low load-bearing capacity, there is no need to worry about the load-bearing risk of the supporting base. The solar cells adopt a 4-string series connection, the busbar welding structure is simple, and the number of solar cells has a cost advantage compared to the existing ones. The electrical components have a high degree of matching with old photovoltaic modules, and can replace most of the old photovoltaic modules in old photovoltaic power stations, meeting the requirements for replacement installation and compatibility. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the replaceable flexible photovoltaic module of this utility model;

[0014] Figure 2 A schematic diagram showing a replaceable flexible photovoltaic module being laid flat and pasted onto the front of an old photovoltaic module;

[0015] Figure 3 for Figure 2 One of the schematic diagrams of the back of a replaceable flexible photovoltaic module;

[0016] Figure 4 for Figure 2 The second schematic diagram of the back of a replaceable flexible photovoltaic module;

[0017] Figure 5 A schematic diagram of a half-cell solar cell cut from a rectangular solar cell;

[0018] Figure 6 This is a circuit connection diagram of the component of this utility model. Detailed Implementation

[0019] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0020] A type of flexible photovoltaic module that can replace old photovoltaic power plants, as shown in the attached document. Figure 1 , 6 As shown, it includes a battery cell 1, a transparent front panel 2, a busbar 3, a positive lead wire 4, a negative lead wire 5, a reinforced back panel 6, and a junction box.

[0021] Solar cell 1 consists of four parallel strings of cells laid on the transparent front panel 2. Each string comprises 14 or 17 half-cells 11 cut from 210mm × 210mm PERC rectangular solar cells, connected in series. All four strings on the same module are identical, meaning each string contains the same number of half-cells. Figure 5 The image shows two half-cells cut from a rectangular 210mm x 210mm cell.

[0022] 4 strings of battery strings are arranged with the positive and negative electrode positions reversed every two adjacent strings, the negative electrode of the first string of battery strings is connected with the positive electrode of the second string of battery strings by the busbar 3, and the positive and negative electrodes of the 4 strings of battery strings are sequentially connected by the busbar 3 to form a series connection; the positive electrode of the first string of battery strings is connected with the negative electrode of the second string of battery strings by the positive electrode lead-out wire 4, the positive electrode lead-out wire 4 is arranged to pass through the hole in the transparent front plate 2 and is connected with a junction box, the positive electrode of the third string of battery strings is connected with the negative electrode of the fourth string of battery strings by the negative electrode lead-out wire 5, the negative electrode lead-out wire 5 also passes through the hole in the transparent front plate 2 and is connected with another junction box, and the two junction boxes are on the front surface of the replaceable flexible photovoltaic module.

[0023] As shown in the accompanying drawings, the replaceable flexible photovoltaic module is provided with structural glue 61 and foam tape 62 on the outer side of the reinforced back plate 6. Figure 3 、 4 As shown in the accompanying drawings, the replaceable flexible photovoltaic module is provided with structural glue 61 and foam tape 62 on the outer side of the reinforced back plate 6. Figure 2 As shown in the accompanying drawings, the replaceable flexible photovoltaic module is provided with structural glue 61 and foam tape 62 on the outer side of the reinforced back plate 6.

[0024] The size of the photovoltaic module currently used in the old photovoltaic power station is mostly 156 battery piece version.

[0025] An old photovoltaic module has a module power of 250-295W, a module short-circuit current of 8.68-9.56A, a module open-circuit voltage of 37.7-39.5V, and a module version size of 1640-1650mm x 990-992mm. The replaceable flexible photovoltaic module of the present application uses a total of 56 half battery pieces, i.e., 14 half battery pieces per string of battery strings. Taking a 210mm x 210mm PERC battery piece with an efficiency of 23.5% as an example, the module power is 290W, the module short-circuit current is 9.12A, the module open-circuit voltage is 38.92V, and the module version size is 1565mm x 920mm. Figure 3 As shown in the accompanying drawings, the replaceable flexible photovoltaic module is provided with structural glue 61 and foam tape 62 on the outer side of the reinforced back plate 6.

[0026] An old photovoltaic module is: module power 295-335W, module short-circuit current 8.72-9.41A, module open-circuit voltage 45.1-46.4V, module version size 1957-1968mm*990-992mm. The corresponding application can replace the flexible photovoltaic module with 68 half-cell pieces, that is, 17 half-cell pieces are used in each cell string. Taking 210mm*210mm PERC cell with an efficiency of 23.5% as an example, the module power is 350W, the module short-circuit current is 9.12A, the module open-circuit voltage is 47.26V, and the module version size is 1883mm*920mm, and the Figure 4 The back structure adhesive and foam tape layout schematic diagram of the version size module is shown, 5 strips of structure adhesive with a width of 6-10mm, a height of 3-5mm and a length of 920mm are punched, and 2 strips of foam tape with a width of 16mm, a length of 920mm and a thickness of 2mm are attached.

[0027] The above two replacement schemes can make the replaceable flexible photovoltaic module be pasted and installed on the old photovoltaic module, and the electrical parameter matching degree is very high.

[0028] The replaceable flexible photovoltaic module of the application can one-to-one replace the old photovoltaic module of the old power station. The old photovoltaic module does not need to be disassembled, the installation steps are simple, only need to be pasted and fixed, and the replaceable flexible photovoltaic module itself is light, only about 2.8kg / m 2 The old support or special installation scene such as building roof bearing is relatively low, and there is no need to worry about the support surface bearing risk. The cell pieces are connected in series in 4 strings, the bus bar welding structure is simple and the number of cell pieces has cost advantage over the existing one, the electrical parameters match the old photovoltaic module well, and most of the old photovoltaic modules in the old photovoltaic power station can be replaced, meeting the requirements of replacement and installation and compatibility.

Claims

1. A replaceable flexible photovoltaic module for an aging photovoltaic power plant, characterized by: The application relates to a replaceable flexible photovoltaic module, which comprises battery pieces (1), a transparent front plate (2), busbars (3), positive electrode lead-out wires (4), negative electrode lead-out wires (5), reinforced back plates (6) and junction boxes, wherein the battery pieces (1) are arranged in parallel on the transparent front plate (2) in four groups of battery strings, each group of battery strings is composed of 14 or 17 half battery pieces cut from a 210mm*210mm PERC rectangular battery piece, every two adjacent groups of battery strings are arranged reversely in positive and negative electrode positions and are connected in series, the negative electrode of the first group of battery strings is connected with the positive electrode of the second group of battery strings, the positive electrode of the first group of battery strings is connected with the negative electrode of the second group of battery strings through the positive electrode lead-out wires (4), the positive electrode of the third group of battery strings is connected with the negative electrode of the fourth group of battery strings through the negative electrode lead-out wires (5), and the positive electrode lead-out wires (4) and the negative electrode lead-out wires (5) are connected with one of the junction boxes respectively, and the replaceable flexible photovoltaic module is pasted on the front surface of an old photovoltaic module through the outer side surface of the reinforced back plate (6).

2. The replaceable flexible photovoltaic module for old photovoltaic power stations according to claim 1, characterized in that: The positive electrode lead-out wires (4) and the negative electrode lead-out wires (5) are connected with the battery strings through holes in the transparent front plate (2).

3. The replaceable flexible photovoltaic module for old photovoltaic power stations according to claim 1, characterized in that: The replaceable flexible photovoltaic module has a module power of 290W, a module short-circuit current of 9.12A, a module open-circuit voltage of 38.92V, a module version size of 1565mm*920mm and a total of 56 half battery pieces, and is suitable for replacing an old photovoltaic module with a module power of 250-295W, a module short-circuit current of 8.68-9.56A, a module open-circuit voltage of 37.7-39.5V and a module version size of 1640-1650mm*990-992mm.

4. The replaceable flexible photovoltaic module for old photovoltaic power stations according to claim 1, characterized in that: The replaceable flexible photovoltaic module has a module power of 350W, a module short-circuit current of 9.12A, a module open-circuit voltage of 47.26V, a module version size of 1883mm*920mm and a total of 68 half battery pieces, and is suitable for replacing an old photovoltaic module with a module power of 295-335W, a module short-circuit current of 8.72-9.41A, a module open-circuit voltage of 45.1-46.4V and a module version size of 1957-1968mm*990-992mm.

5. The replaceable flexible photovoltaic module for old photovoltaic power stations according to claim 1, characterized in that: The replaceable flexible photovoltaic module is pasted on the front surface of an old photovoltaic module through the outer side surface of the reinforced back plate (6) by using structural glue (61) and foam adhesive tape (62).

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