WO2023065613A1 - Preparation method for fully-parallel photovoltaic shutter and photovoltaic shutter thereof - Google Patents

Abstract

A preparation method for a fully-parallel photovoltaic shutter, comprising the following steps: S100: designing and manufacturing a single shutter blade assembly (1) according to overall voltage parameter requirements of the photovoltaic shutter; S200: vertically arranging a plurality of shutter blade assemblies (1) sequentially and arranging all of positive electrodes (13) thereof on the same side, arranging all of negative electrodes (14) thereof on the other side, electrically connecting every two adjacent positive electrodes (13), and electrically connecting every two adjacent negative electrodes (14); and S300: providing a positive terminal (2) on the positive electrode (13) of the topmost shutter blade assembly (1), providing a negative terminal (3) on the negative electrode (14) of the topmost shutter blade assembly (1), electrically connecting the positive terminal (2) to the positive electrode of a rear-end external device, and electrically connecting the negative terminal (3) to the negative electrode of the rear-end external device. Due to the characteristics of a parallel circuit, each shutter blade is a current path, when a local shutter blind of the photovoltaic shutter is shielded by a shadow, the unshielded photovoltaic shutter blades can still generate power and have the advantage that the paths are conducted to be transmitted to a rear end for energy storage or use, the electric quantity loss thereof is low, and heat spot resistance is good.

Description

A preparation method of fully parallel photovoltaic blinds and photovoltaic blinds

This application claims the priority of the Chinese patent application with the application number 202111220523.3 and the application name "a method for preparing fully parallel photovoltaic shutters and photovoltaic shutters" submitted to the China Patent Office on October 20, 2021, the entire content of which has been passed References are incorporated in this application.

technical field

The invention belongs to the technical field of solar photovoltaics, and in particular relates to a method for preparing a full-parallel photovoltaic blind and the photovoltaic blind.

Background technique

At present, China's primary energy reserves are far below the world's average level, only about 10% of the world's total reserves. Solar energy is an inexhaustible renewable energy for human beings. It has sufficient cleanliness, absolute safety, relative extensiveness, long life and maintenance-free, resource adequacy and potential economy. It has an important position in the long-term energy strategy. In densely populated cities, with the increasing development of new energy sources, there are still a large number of households who do not have the ability to install solar energy on their roofs, and cannot make full use of solar energy resources.

Most of the shutters in real life are used in homes, offices, etc., and are generally used for indoor and outdoor sunshade, ventilation, and adjustment of indoor luminosity. or skylights, etc.) photovoltaic shutters that generate electricity at the same time, maximize the utilization efficiency of solar energy, and scientifically design natural ventilation and lighting technology, which greatly improves the comfort of the living environment and significantly reduces building energy consumption.

Disadvantages of the prior art: 1. Due to the electrical characteristics of the full series connection (the total voltage is equal to the sum of the voltages of each sheet), the total voltage of the blinds is relatively high, which makes it difficult to match some low-voltage back-end energy storage systems (such as 6V, 12V energy storage system), and the high voltage also has some safety hazards; 2. The electrical characteristics of the full series lead to its poor anti-hot spot performance. When a local area or several louvers are shaded, the power generation will be obvious. 3. When a louver is not conducting (fault or poor connection), the entire photovoltaic louver is in a state of non-power generation.

In view of this, the present invention is proposed.

application content

In view of this, the object of the present invention is to provide a method for preparing fully parallel photovoltaic shutters and photovoltaic shutters thereof.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A method for preparing fully parallel photovoltaic blinds, comprising the steps of:

S100: Design and manufacture a single louver assembly according to the overall voltage parameter requirements of the photovoltaic louver;

S200: Arrange several louver assemblies vertically in sequence and set all their positive poles on the same side, set all their negative poles on the same side on the other side, two adjacent positive poles are electrically connected, and two adjacent negative poles are electrically connected. sexual connection;

S300: The positive pole of the topmost louver assembly is provided with a positive terminal, the negative pole of the topmost louver assembly is provided with a negative terminal, the positive terminal is electrically connected to the positive pole of the rear external device, and the negative terminal is electrically connected to the negative pole of the rear external device.

Further, step S100 includes the following steps:

S110: Determine the overall voltage parameters of the photovoltaic shutter and select the size requirements of the shutter assembly;

S120: Calculate the layout size and quantity of the crystalline silicon cells;

S130: cutting crystalline silicon cells;

S140: Connecting crystalline silicon cells to form at least one group of cell strings;

S150: Laminating and joining junction boxes to form a single louver assembly.

Further, step S120 includes the following steps:

S121: Select a safe electrical distance and remove the perforated area to determine the arrangement area of the crystalline silicon cells;

S122: Determine the number of crystalline silicon solar cells according to the arrangement area of the crystalline silicon solar cells and the voltage parameters;

S123: Determine the arrangement size of each side of the crystalline silicon solar cells according to the size requirements of the louver assembly, the electrical distance, the quantity and the arrangement spacing of the crystalline silicon solar cells.

Further, the connection method in step S140 is ribbon connection or conductive adhesive bonding.

Further, the conductive adhesive can be any one of epoxy resin type conductive adhesive, acrylic type conductive adhesive and silicone type conductive adhesive.

Further, before step S130, it also includes the steps of selecting cell grids and making crystalline silicon cells. The selection method is to design the cell grids through the determined target size or select regular cell grids, and then print and manufacture Crystalline silicon cells.

The present invention also provides a photovoltaic louver, including a louver assembly, which is characterized in that positive and negative electrodes are respectively arranged on both sides of the louver assembly, and several of the louver assemblies are arranged vertically in sequence, wherein the The positive poles are located on the same side, the negative poles are located on the same side, two adjacent positive poles are electrically connected, and two adjacent negative poles are electrically connected to form an overall parallel circuit of the photovoltaic shutter.

Further, the positive pole of the topmost louver assembly is provided with a positive terminal, the negative pole of the topmost louver assembly is provided with a negative terminal, and the positive terminal and the negative terminal are respectively electrically connected to an external connection at the rear end. on the positive and negative poles of the system.

Further, the louver assembly includes several crystalline silicon cells evenly arranged, and two adjacent crystalline silicon cells are connected in series.

Further, the louver assembly is provided with pull cord holes near the positive terminal and the negative terminal.

Compared with the prior art, the beneficial effects of the present invention are as follows: firstly, compared with the full-series louvers, when partially blocked, the entire louver stops generating power because there is only one current path, and the full-parallel photovoltaic louvers It has excellent anti-shade power generation ability. Due to the characteristics of the parallel circuit, each louver is a current path. When the partial venetian blinds of the photovoltaic louvers are shaded, the unshaded photovoltaic louvers can still generate electricity, and have The conduction path is transported to the back end for energy storage or use; secondly, the full-parallel photovoltaic blinds have excellent anti-crack and anti-fault power generation capabilities. In actual use, the external environment such as wind and snow will Cause cracks, fragments and other damage to the louver components. The characteristics of the full parallel circuit will make the cracked louver components not affect the power output of other louver components, and the impact will be controlled to the local area. Compared with full-series photovoltaic shutters, There will be lower power loss. Again, it is convenient for later maintenance and replacement. This case adopts the wiring method of the upper and lower sheets on the back, which is convenient for later investigation, replacement and maintenance; further, the overall voltage range of the full-parallel photovoltaic shutter is wider, and can match 6V, 12V and other low-voltage energy storage systems, and low-voltage blinds are safer and more stable; furthermore, this case has better anti-hot spot performance. Low, reducing the probability of burn-through and safety accidents.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the back view of photovoltaic shutter in the present invention;

Fig. 2 is the front view of photovoltaic shutter in the present invention;

Fig. 3 is a schematic diagram of the electrical connection of the louver assembly in the present invention;

Fig. 4 is a schematic structural view of the louver assembly in Embodiment 1 of the present invention;

Fig. 5 is a schematic structural view of the louver assembly in Embodiment 2 of the present invention;

Fig. 6 is the flowchart of the preparation method of a kind of fully parallel photovoltaic blinds in the present invention;

Fig. 7 is the flowchart of step S100 among the present invention;

FIG. 8 is a flowchart of step S120 in the present invention.

Reference signs and component parts involved in the accompanying drawings:

1(1A)-louver assembly; 11(11A)-crystalline silicon cell; 12(12A)-hole for lifting rope; 13(13A)-positive pole; 14(14A)-negative pole; 15-welding ribbon; 2 - positive terminal; 3 - negative terminal.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below through specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Embodiment one

Referring to Fig. 1 to Fig. 4 and Fig. 6 to Fig. 8, a preparation method of fully parallel photovoltaic blinds, the method comprises the following steps:

S100: Design and manufacture a single louver assembly 1 according to the overall voltage parameter requirements of the photovoltaic louver;

S200: Arrange several louver assemblies 1 vertically in sequence and set their positive poles 13 on the same side, and set their negative poles 14 on the same side on the other side, and two adjacent positive poles 13 are electrically connected, and two adjacent The negative electrode 14 is electrically connected to form an overall parallel circuit;

S300: The positive pole 13 of the topmost louver assembly 1 is provided with a positive terminal 2, the negative pole 14 of the topmost louver assembly 1 is provided with a negative terminal 3, the positive terminal 2 is electrically connected to the positive pole of the rear external device, and the negative terminal 3 is connected to the rear The negative pole of the external device is electrically connected, and the rear external device is specifically a rear energy storage system or an inverter system to realize energy storage, discharge and energy conversion of the rear external device.

Step S100 includes the following steps:

S110: Determine the overall voltage parameters of the photovoltaic shutter and select the size requirements of the louver assembly 1. Specifically, the overall voltage requirement of a photovoltaic shutter is 18V (the component voltage required by a 12V battery system is generally 18V), and its louver The size requirements of component 1 are: length 650mm, width 80mm. The full-parallel photovoltaic blinds used in this application have a wider overall voltage range, can match low-voltage energy storage systems such as 6V and 12V, and low-voltage blinds are safer and more stable.

S120: Calculate the arrangement size and quantity of the crystalline silicon cells 11. Step S120 includes the following steps:

S121: Select a safe electrical distance and remove the perforated area to determine the arrangement area of the crystalline silicon cells 11. Specifically: the electrical safety distance can be selected with reference to the latest I EC61730 implementation standard, leaving a perforated area space for subsequent The implementation of drilling and installation is pre-calculated to prevent the margins of the drilling from being too small due to insufficient space in the drilling area during the later drilling, resulting in the occurrence of low strength of the installation part or incomplete installation holes after installation, and avoiding the occurrence of drill bits. In the event of large swings or even drill bit breakage during drilling, the size of the arrangement area for arranging crystalline silicon cells 11 is finally determined by the above method: the length is 520mm, the width is 60mm, and the arrangement area is rectangular.

S122: Determine the number of crystalline silicon solar cells 11 according to the layout area of the crystalline silicon solar cells 11 and the voltage parameters. It is known that the number of crystalline silicon solar cells 11 required to reach the 18V voltage is between 34-36 pieces. In this case, choose 34 rectangular crystalline silicon cells 11 are designed.

S123: Determine the arrangement size of each side of the crystalline silicon cells according to the size requirements of the louver components, the electrical distance, the number of the crystalline silicon cells, and the arrangement spacing. Place 34 crystalline silicon solar cells 11 in a straight line, and the size of one side of the crystalline silicon solar cells 11 must be ≤ 60 mm. In this case, 60 mm is selected for design. Determine the size of the other side of the other crystalline silicon cells 11. Specifically, first select an arrangement spacing of 1.5mm, and arrange 34 silicon crystal cells 11 in the direction of the length arrangement of 520mm. The other side of the silicon cell 11 The size is calculated by the formula as (520-33×1.5)/34=13.8mm. Based on the above data, the plane size of a single silicon cell plate is 60mm×13.8mm.

S130: Cutting the crystalline silicon cell 11, before the step S130, it also includes the steps of selecting the cell grid and making the crystalline silicon cell 11, the selected method is to design the cell grid or select a regular battery through the determined target size Afterwards, the crystalline silicon battery sheet 11 is printed and manufactured. Specifically, the crystalline silicon battery sheet 11 with a plane size of 60mm×13.8mm is cut according to specific rules such as 125mm2BB, 156mm4BB, 158.75mm5BB, 166mm9BB, and 182mm9BB. On the crystalline silicon wafer of the screen, the crystalline silicon cell 11 of the target size is directly obtained by laser scribing and printed to make the silicon crystalline silicon cell 11. It is also possible to design the cell screen with the determined target size and print to make the crystalline silicon cell. Silicon cells 11.

S140: Connect the crystalline silicon cells 11 to form at least one group of battery strings, the number of which is selected according to the specific voltage and other parameters. The connection mode of the silicon cells 11 is the connection of the silicon cells 15 or the bonding of the conductive adhesive, which is selected in this embodiment. The production process of welding ribbon 15 connection is to weld 34 crystalline silicon cells 11 in series to form a battery string, and the two ends of the ribbon are provided with positive and negative electrodes to form the positive and negative electrodes of the battery string. Further, the ribbon 15 connects the crystalline silicon battery After the strips 11 are serially welded, they extend vertically to both sides and are bent to form symmetrical ribbon shunts to facilitate subsequent connections.

S150: Laminate and connect the junction box to form a single louver assembly 1, specifically, package the laminated battery string and electrically connect the wires on the positive and negative poles of the battery string respectively, and lead the wires to the back of the louver and connect them to the positive pole A positive contact is provided at the outlet of 13, and a negative contact is formed at the outlet of the negative electrode 14. The positive contact and the negative contact are respectively electrically connected to the junction box to form a single louver assembly 1.

Embodiment two

Referring to Fig. 5, the difference from Embodiment 1 is that in this embodiment, a conductive adhesive bonding process is used for connection and fabrication. Specifically, when calculating the size of the crystalline silicon cell 11A, it is based on the layout of the crystalline silicon in the shingled grid. Calculated on the principle of ratio maximization, which improves the utilization rate of materials, and finally determines the size of the crystalline silicon cell 11A to be 16.8mm×52.9mm, and the stacking depth is 1.8mm, and then cuts the crystalline silicon cell 11A of the above size; When the crystalline silicon cell 11A is connected, each crystalline silicon cell 11A is stacked and then cured and bonded by conductive adhesive. The conductive adhesive can be any one of epoxy resin type conductive adhesive, acrylic type conductive adhesive, and silicone type conductive adhesive. type, to further form the shingled string, and then the positive electrode 13A and the negative electrode 14A on both sides of the shingled string are respectively led out to the positive electrode wire and the negative electrode wire, and the positive electrode wire is divided into two strands and led to the back of the louver, and the negative electrode wire is also divided into two strands. Stranded wires lead to the back of the louver, that is, there are two positive contacts on one side of each louver, and two negative contacts on the other side; finally, the packaging and lamination of the crystalline silicon cell 11A are carried out and installed at the outlet of each strand of wire on the back The junction box is manufactured as a single complete louver assembly 1A. In this case, the wiring method of upper and lower pieces on the back is used, which is convenient for later inspection, replacement and maintenance.

Referring to Figures 1 to 5, the present invention also provides a photovoltaic louver, including a louver assembly 1, the louver assembly 1 includes several uniformly arranged crystalline silicon cells 11, two adjacent crystalline silicon cells 11 are connected in series, To meet the needs of the design voltage, positive poles 13 and negative poles 14 are arranged on both sides of the louver assembly 1 respectively, and several louver assemblies 1 are arranged in sequence, wherein the positive poles 13 are located on the same side, the negative poles 14 are located on the same side, and two adjacent The positive electrodes 13 are electrically connected, and two adjacent negative electrodes 14 are electrically connected to form an overall parallel circuit. Compared with the full-series louver, which has the limiting feature that the entire louver stops generating power when it is partially blocked because there is only one current path, the full-parallel photovoltaic louver has excellent anti-shade power generation capabilities. Due to the characteristics of the parallel circuit, each A louver is a current path. When the partial venetian blind of the photovoltaic louver is shaded, the unshaded photovoltaic louver can still generate electricity, and has the advantage of conducting the path to the back end for energy storage or use. In addition , has better anti-hot spot performance. Compared with full-tandem shutters, when partial shadow shading occurs, the probability of burn-through and safety accidents is reduced because of the lower temperature at the shading place.

The above is that the positive pole 13 of the topmost louver assembly 1 is provided with a positive terminal 2, and the negative pole 14 of the topmost louver assembly 1 is provided with a negative terminal 3, and the positive terminal 2 and the negative terminal 3 are respectively electrically connected to the rear external device on the positive and negative poles. The side of the louver assembly 1 close to the positive terminal 2 and the negative terminal 3 is provided with a pull rope hole 12, which is convenient for the pull rope to be threaded and connected, and is convenient for later maintenance and replacement. Further, the pull rope hole The position 12 is set between the two welding ribbon branches, and the hole position 12A of the pull rope is located between the two wires in the second embodiment.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method for preparing fully parallel photovoltaic blinds, comprising the steps of:

   S100: Design and manufacture a single louver assembly according to the overall voltage parameter requirements of the photovoltaic louver;

   S200: Arrange several louver assemblies vertically in sequence and set all their positive poles on the same side, set all their negative poles on the same side on the other side, two adjacent positive poles are electrically connected, and two adjacent negative poles are electrically connected. sexual connection;

   S300: The positive pole of the topmost louver assembly is provided with a positive terminal, the negative pole of the topmost louver assembly is provided with a negative terminal, the positive terminal is electrically connected to the positive pole of the rear external device, and the negative terminal is electrically connected to the negative pole of the rear external device.
2. A method for preparing fully parallel photovoltaic blinds according to claim 1, wherein step S100 comprises the following steps:

   S110: Determine the overall voltage parameters of the photovoltaic shutter and select the size requirements of the shutter assembly;

   S120: Calculate the layout size and quantity of the crystalline silicon cells;

   S130: cutting crystalline silicon cells;

   S140: Connecting crystalline silicon cells to form at least one group of cell strings;

   S150: Laminating and joining junction boxes to form a single louver assembly.
3. A method for preparing fully parallel photovoltaic shutters as claimed in claim 2, wherein step S120 comprises the following steps:

   S121: Select a safe electrical distance and remove the perforated area to determine the arrangement area of the crystalline silicon cells;

   S122: Determine the number of crystalline silicon solar cells according to the arrangement area of the crystalline silicon solar cells and the voltage parameters;

   S123: Determine the arrangement size of each side of the crystalline silicon solar cells according to the size requirements of the louver assembly, the electrical distance, the quantity and the arrangement spacing of the crystalline silicon solar cells.
4. The method for preparing fully parallel photovoltaic blinds according to claim 2, characterized in that, the connection method in step S140 is welding strip connection or conductive adhesive bonding.
5. A method for preparing fully parallel photovoltaic louvers as claimed in claim 4, characterized in that the conductive adhesive can be any one of epoxy resin type conductive adhesive, acrylic type conductive adhesive and silicone type conductive adhesive.
6. A method for preparing fully parallel photovoltaic shutters as claimed in claim 2, characterized in that, before step S130, it also includes the steps of selecting cell grids and making crystalline silicon cells. The design of the stencil may select a regular cell stencil, and then print and make crystalline silicon cells.
7. A photovoltaic louver, comprising a louver assembly, characterized in that positive and negative electrodes are arranged on both sides of the louver assembly, and several of the louver assemblies are arranged vertically in sequence, wherein the positive electrodes are located on the same side , the negative poles are located on the same side, the two adjacent positive poles are electrically connected, and the two adjacent negative poles are electrically connected to form an overall parallel circuit of the photovoltaic shutter.
8. The photovoltaic shutter according to claim 7, wherein the positive pole of the topmost louver assembly is provided with a positive terminal, the negative pole of the topmost louver assembly is provided with a negative terminal, and the positive terminal is and the negative terminal are respectively electrically connected to the positive pole and the negative pole of the back-end external connection system.
9. The photovoltaic louver according to claim 8, wherein the louver assembly comprises several crystalline silicon solar cells uniformly arranged, and two adjacent crystalline silicon solar cells are connected in series.
10. The photovoltaic louver according to claim 8, wherein the louver assembly is provided with pulling rope holes on the sides close to the positive terminal and the negative terminal.

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