Solar cell module

Abstract

The utility model discloses a solar cell module, which improves the power of the solar module on the basis of the prior art, and comprises a solar cell array and a packaging structure, the solar cell array is of a rectangular structure, solar cells are of a rectangular structure, and the solar cells are provided with silk-screen printing pattern structures. The long sides of the solar cells are parallel to the short sides of the solar cell array. According to the utility model, the solar cell is designed into a rectangular structure, the shape of a slice can be changed by only adjusting slice parameters without changing the existing slicing equipment, and the layout of the assembly is changed by adjusting the printed pattern structure of the cell, so that a new assembly model is formed, and the power of the solar energy assembly is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to photovoltaic technical field, concretely relates to solar cell module. BACKGROUND

[0002] Solar cell power generation is a main way for people to utilize solar energy at present. However, a single solar cell cannot be directly used as a power supply, and a plurality of single cells must be connected in series and parallel and tightly packaged to form a solar cell module. The solar cell module, also known as a solar cell panel, is the core of a solar power generation system and is the most critical component in the system. Its main function is to convert solar energy into electrical energy or store electrical energy in a storage battery or directly drive a load to work. When using a solar module, if the module size is the same, the higher the module power and the better the conversion efficiency, the terminal power station's income can be significantly improved. At present, the production and application of solar modules usually depend on supporting equipment. Therefore, how to improve the power of the solar module on the basis of the existing technology and reduce equipment modification and new equipment investment has become an urgent problem to be solved. SUMMARY

[0003] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a solar cell module to improve the power of the solar module on the basis of the prior art.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A solar cell module comprises a solar cell array and a packaging structure, the solar cell array is in a rectangular structure, the solar cell is in a rectangular structure, the solar cell is provided with a screen printing pattern structure, and the long side of the solar cell is parallel to the short side of the solar cell array.

[0006] Preferably, the screen printing pattern structure comprises a plurality of parallel main grid lines and a plurality of parallel auxiliary grid lines, the main grid lines are parallel to the short side of the solar cell, the auxiliary grid lines are parallel to the long side of the solar cell, and the main grid lines and the auxiliary grid lines are vertically crossed and electrically connected.

[0007] Preferably, the size of the solar cell is 182mm*210mm, the number of the main grid lines is 18-22, and the distance between the adjacent two main grid lines is 9-12mm.

[0008] Preferably, the main grid lines are spaced apart along the length direction and are provided with a plurality of solder pads.

[0009] Preferably, the long side of the solar cell is provided with several fish-tail lines, the main grid line end is connected with the fish-tail line through the soldering pad, the middle position of the width of the solar cell is provided with two rows of fish-tail lines symmetrically on both sides of the width center line, the two rows of fish-tail lines are connected with the main grid line through the soldering pad, and the auxiliary grid line penetrates the fish-tail line.

[0010] Preferably, the fish-tail line is a width gradient structure with a narrow bottom opening and a wide width, and the opening width is 1-2 mm, and the fish-tail line height is 3-6 mm.

[0011] Preferably, the size of the solar cell module is 1303mm x 2465mm.

[0012] Preferably, the solar cell array is in the form of a 6x13 array, the solar cells are arranged at equal distances, and / or the transversely adjacent two solar cells are electrically connected through the bus bar, and the longitudinally adjacent two solar cells are electrically connected through the interconnecting strip, so that all the solar cells are connected in series to form the solar cell array.

[0013] Preferably, the packaging structure comprises a first layer of glass located on the upper side of the solar cell array, a first layer of adhesive film, and a second layer of adhesive film and a second layer of glass located on the lower side of the solar cell array.

[0014] Preferably, the second layer of adhesive film adopts a three-layer co-extrusion structure of EVA / POE / EVA, and the first layer of adhesive film is an EVA adhesive film.

[0015] The utility model discloses the above-mentioned technical scheme has the following beneficial effects:

[0016] 1. In the solar cell module, the cells are arranged at equal distances to form an equal-interval cell array, the shape of the solar cell is changed, i.e., the solar cell is designed as a rectangular structure, and the layout of the module can be changed by adjusting the printed pattern structure of the cell, thereby forming a new module version to improve the power of the solar module. Since the solar cell is designed as a rectangular structure, the existing slicing equipment does not need to be changed, and only the slicing parameters need to be adjusted to change the slicing shape, thereby maximizing the power of the module while reducing the need for equipment modification and investment in new equipment.

[0017] 2. On a solar cell, the main busbar is located on the positive side of the cell and is typically wider, used to collect the electricity generated by the cell. The secondary busbar, located on the negative side of the cell and narrower, is primarily used to balance the distribution of electricity between cells. To increase the power of solar panels, the distribution of the main busbars can be optimized by changing the printing of the cells to create a new arrangement. Because the main busbars are parallel to the short side of the solar cell and the secondary busbars are parallel to the long side of the solar cell, the length of the main busbars can be increased, thereby increasing the number of main busbars, improving current collection capacity, and ultimately increasing the power of the solar panel.

[0018] 3. Taking the solar cell size of 182mm×210mm as an example, the number of busbars is 18 to 22, and the spacing between two adjacent busbars is 9 to 12mm. If the number of busbars is too large, the current collection capacity will not be significantly improved, and the cost will increase. Therefore, this design increases the number of busbars, improves the current collection capacity, and avoids excessive cost increases.

[0019] 4. The main grid line has several welding pads spaced apart along its length. At the same time, there are several harpoon wires on the long side of the solar cell. Two rows of harpoon wires are symmetrically arranged on both sides of the width midline in the middle of the width. The harpoon wires are connected to the main grid line through welding pads. At the same time, the secondary grid line runs through the harpoon wires to avoid problems such as hidden cracks in component welding and broken harpoon wires.

[0020] 5. The size of the solar cell module is 1303mm x 2465mm, the solar cell array is a 6×13 array, and the size of a single cell is 182mm×210mm. The application of this arrangement can increase module power, improve module efficiency, and reduce application costs.

[0021] 6. The first film layer is made of EVA, a copolymer of ethylene and vinyl acetate. The cross-linked EVA film exhibits excellent light transmittance, helping to protect the fragile silicon wafer solar cells and improve light absorption. The second film layer utilizes a three-layer co-extruded EVA / POE / EVA film encapsulation solution. This combines the high water resistance and PID resistance of POE film with the high yield lamination process of EVA film for double-glass modules, securing the cell array to the glass panel and enhancing product reliability.

[0022] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Brief Description of the Drawings

[0023] The utility model is further described below with reference to the accompanying drawings:

[0024] Figure 1A plan view of a solar cell module;

[0025] Figure 2 A schematic view of a photovoltaic array formed by transversely adjacent two solar cell pieces being electrically connected by bus bars;

[0026] Figure 3 A schematic view of a photovoltaic array formed by longitudinally adjacent two solar cell pieces being electrically connected by interconnection bars;

[0027] Figure 4 A view of a solar cell array formed by series connection of the solar cell pieces;

[0028] Figure 5 A view of a packaging structure of a solar cell piece;

[0029] Figure 6 A plan view of a solar cell piece;

[0030] Figure 7 An enlarged view of A in 6;

[0031] Figure 8 An enlarged view of B in 6;

[0032] Reference signs: solar cell piece 1, main grid line 11, sub grid line 12, solder pad 13, fish-tail line 14, bus bar 15, interconnection bar 16, first layer of adhesive film 2, first layer of glass 3, second layer of adhesive film 4, second layer of glass 5.

DETAILED DESCRIPTION

[0033] The technical solutions of the embodiments of the present application will be explained and described below in combination with the drawings of the embodiments of the present application. However, the following embodiments are only preferred embodiments of the present application, and are not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor are all within the protection scope of the present application.

[0034] Those skilled in the art can understand that the features in the following embodiments and embodiments can be combined with each other without conflict.

[0035] The terms used in the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. For example, the words indicating the orientation or position relationship such as "upper", "lower", "inner", "outer", "longitudinal", "transverse" and the like in the following description are only based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0038] This embodiment changes the shape of the solar cell, that is, designs the solar cell into a rectangular structure, and changes the layout of the module by adjusting the printed graphic structure of the cell, thereby forming a new module format to increase the power of the solar module.

[0039] refer to Figure 1 and Figure 6 As shown, a solar cell assembly includes a solar cell array and an encapsulation structure. The solar cell array is a rectangular structure formed by arranging a plurality of solar cells 1. The solar cells are provided with a screen-printed pattern structure, and the cells can be connected in series. The solar cells 1 are rectangular in structure, the solar cell array is also rectangular in structure, and the long side A3 of the solar cell is parallel to the short side A1 of the solar cell assembly, and the short side A4 of the solar cell is parallel to the long side A2 of the solar cell assembly.

[0040] Since the solar cells are designed as rectangular structures, there is no need to change the existing slicing equipment. The shape of the slices can be changed by adjusting the slicing parameters. This maximizes the power of the components while reducing the need for equipment modification and investment in new equipment.

[0041] Referring to the Chinese utility model patents with the publication numbers CN 213459749 U and CN 220242718 U, the traditional battery piece is square. On the solar battery piece, the main grid line is located on the positive electrode surface of the battery piece, usually with a wide width, and is used to collect the electrical energy generated by the battery piece; and the auxiliary grid line is located on the negative electrode surface of the battery piece, with a narrow width, and is mainly used to balance the electrical energy distribution between the battery pieces. The traditional square battery piece, because the four side lengths are consistent, the grid line printing direction does not affect the arrangement of the battery piece inside the module. The rectangular battery piece, because the four side lengths are inconsistent, has long and short sides, and the grid line printing direction affects the arrangement of the battery piece inside the module. At present, the grid line printing direction of the rectangular battery piece is that the main grid line direction is parallel to the long side direction of the rectangle, and the auxiliary grid line direction is parallel to the short side direction of the rectangle, but this printing method limits the design of the module version, cannot effectively improve the conversion efficiency of the module, and cannot better meet the market demand. However, with the market's higher demand for the power of the module, the rectangular battery piece is applied to the module in the present embodiment, in order to improve the power of the solar module, the distribution of the main grid line can be optimized, and a new arrangement method is formed by changing the printing of the battery piece, such as the solar battery piece shown in Figures 6 to 8 The screen-printed pattern structure on the solar battery piece includes a plurality of parallel main grid lines 11 and a plurality of parallel auxiliary grid lines 12, the plurality of main grid lines are parallel to the short side of the solar battery piece, the plurality of auxiliary grid lines are parallel to the long side of the solar battery piece, and the main grid lines and the auxiliary grid lines are vertically crossed and electrically connected. Since the main grid lines are parallel to the short side of the solar battery piece, and the auxiliary grid lines are parallel to the long side of the solar battery piece, the arrangement length of the main grid lines can be increased, thereby increasing the number of main grid lines, improving the current collection capability, and further improving the power of the solar module. By using the battery piece with this grid line distribution, more versions and high-conversion-efficiency modules can be designed through series and parallel connection, better meeting the market demand.

[0042] When the solar battery piece array adopts an equidistant arrangement method, the battery pieces are arranged according to the preset array form during use. As shown in Figure 2 Two horizontally adjacent solar battery pieces are electrically connected through the bus bar 15. As shown in Figure 3 In the longitudinal direction, the front surface of the first row of battery pieces and the back surface of the second row of battery pieces are provided with electrodes, and the electrodes of the adjacent front surface of the first battery piece and the back surface of the second battery piece are welded together through the interconnection strip 16 to form a battery piece array in series as shown in Figure 4 .

[0043] As shown in Figure 5As shown, the encapsulation structure includes a first layer of glass 3 on the upper side of the solar cell array, a first layer of adhesive film 2, and a second layer of adhesive film 4 on the lower side of the solar cell array, and a second layer of glass 5, which are laminated on the completed cell array to form a solar module. The second layer of adhesive film adopts a three-layer co-extrusion structure of EVA / POE / EVA, and the first layer of adhesive film is an EVA adhesive film. The first layer of adhesive film adopts EVA material, which is a copolymer of ethylene and vinyl acetate. The EVA cross-linked encapsulation film exhibits excellent light transmittance, which helps to protect the fragile silicon wafer solar cell and improve light absorption. The second layer of adhesive film adopts a three-layer co-extrusion of EVA / POE / EVA to form an adhesive film encapsulation scheme, which takes into account the high water resistance and high PID resistance of the POE adhesive film, and also has the lamination process characteristics of high yield of the EVA adhesive film double-glass module, which fixes the cell array and the glass plate to increase the reliability of the product.

[0044] Specifically, the size of the solar cell module is 1303mm x 2465mm, the cell array is arranged in an array form of 6 x 13, and the single cell size A3 x A4 is 182mm x 210mm. This arrangement can increase the module power, improve the module efficiency, and reduce the application cost.

[0045] Taking one of the specifications as an example, the size of the solar cell is 182mm x 210mm. The number of main grid lines is 18-22, and the distance between two main grid lines is 9-12mm. The distance between the main grid lines is 8-12 times the distance between the auxiliary grid lines. If the number of main grid lines is too large, the current collection capacity will not be improved significantly, and the cost will also increase. Therefore, this design increases the number of main grid lines to improve the current collection capacity while avoiding excessive cost increase.

[0046] In addition, the main grid line 11 is spaced apart along the length direction and has a plurality of pads 13. The pads have a rectangular structure, and the center line coincides with the main grid line. A plurality of fish-tail lines 14 are arranged on the long side of the solar cell, and the end of the main grid line is connected to the fish-tail line through the pad. Two rows of fish-tail lines are symmetrically arranged on both sides of the width center line at the middle position of the width of the solar cell, and the two rows of fish-tail lines are connected to the main grid line through the pad. The auxiliary grid line penetrates the fish-tail line to avoid the problems of hidden cracks and broken lines in the module welding. The fish-tail line has a width gradient structure with a narrow opening at the bottom and a wide opening. The opening width L of the fish-tail line is 1-2mm, and the height H of the fish-tail line is 3-6mm.

[0047] The above descriptions are only specific embodiments of the utility model, and the protection scope of the utility model is not limited to this, and the skilled in the art should understand that the utility model includes but is not limited to the content described in the drawings and the above specific embodiments.Any modification not deviating from the function and structural principle of the utility model will be included in the scope of claims.

Claims

1. A solar cell assembly comprising a solar cell array and a packaging structure, characterized in that: The solar cell array is in a rectangular structure, the solar cell is in a rectangular structure, the solar cell is provided with a screen-printed pattern structure, and the long side of the solar cell is parallel to the short side of the solar cell array.

2. A solar cell assembly according to claim 1, characterized in that: The screen-printed graphic structure includes several mutually parallel main grid lines and several mutually parallel auxiliary grid lines, wherein the main grid lines are parallel to the short sides of the solar cell sheets, and the auxiliary grid lines are parallel to the long sides of the solar cell sheets. The main grid lines and the auxiliary grid lines are perpendicularly crossed and electrically connected.

3. A solar cell assembly according to claim 2, characterized in that: The size of the solar cell is 182 mm×210 mm, the number of the main grid lines is 18 to 22, and the distance between two adjacent main grid lines is 9 to 12 mm.

4. A solar cell assembly according to claim 2, characterized in that: The main grid line is provided with a plurality of pads spaced apart along the length direction.

5. A solar cell assembly according to claim 4, characterized in that: Several harpoon lines are provided on the long sides of the solar cell, and the ends of the main grid lines are connected to the harpoon lines through welding pads. Two rows of harpoon lines are symmetrically provided on both sides of the width midline in the middle position of the width of the solar cell, and the two rows of harpoon lines are connected to the main grid lines through welding pads, and the auxiliary grid lines pass through the harpoon lines.

6. A solar cell assembly according to claim 5, characterized in that: The harpoon line has a width gradient structure with a narrow bottom and a wide opening, and the opening width is 1 to 2 mm, and the harpoon line height is 3 to 6 mm.

7. A solar cell assembly according to claim 3, characterized in that: The size of the solar cell assembly is 1303mm x 2465mm.

8. A solar cell assembly according to claim 7, characterized in that: The solar cell array is in the form of a 6×13 array, with the solar cells arranged at equal intervals; and / or, two adjacent solar cells in the horizontal direction are electrically connected by a bus bar, and two adjacent solar cells in the vertical direction are electrically connected by an interconnection bar, so that all solar cells are connected in series to form a solar cell array.

9. The solar cell assembly according to claim 1, characterized in that: The packaging structure includes a first layer of glass and a first layer of adhesive film located on the upper side of the solar cell array, and a second layer of adhesive film and a second layer of glass located on the lower side of the solar cell array.

10. A solar cell assembly according to claim 9, characterized in that: The second layer of film adopts an EVA / POE / EVA three-layer co-extrusion structure, and the first layer of film is an EVA film.

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