Solar cell

Abstract

The utility model discloses a solar cell, which can improve the power of a solar module, the solar cell is provided with a silk-screen printing pattern structure, the solar cell is of a rectangular structure, and the silk-screen printing pattern structure comprises a plurality of mutually parallel main grid lines and a plurality of mutually parallel auxiliary grid lines. The plurality of main grid lines are parallel to the short side of the solar cell, the plurality of 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. According to the utility model, the distribution of the main grid lines can be optimized, and the arrangement length of the main grid lines is increased, thereby increasing the number of the main grid lines, improving the current collection capability, and further improving the power of the solar assembly.

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.

[0003] Referring to the Chinese utility model patents with the authorized announcement numbers CN 213459749 U and CN 220242718 U, the traditional battery piece is square. On the solar cell piece, the main grid line is located on the positive electrode surface of the battery piece, usually with a wide width, for collecting 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, mainly for balancing the electrical energy distribution between the battery pieces.

[0004] The screen printing pattern structure in the prior art limits the design of the module version, cannot effectively improve the conversion efficiency of the module, and cannot better meet the market demand. CONTENT OF THE UTILITY MODEL

[0005] 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 piece, optimize the distribution of the main grid line, and form a new arrangement mode by changing the printing of the battery piece.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme:

[0007] A solar cell piece is provided with a screen printing pattern structure, the solar cell piece is of a rectangular structure, the screen printing pattern structure includes a plurality of mutually parallel main grid lines and a plurality of mutually parallel auxiliary grid lines, wherein the main grid lines are parallel to the short sides of the solar cell piece, the auxiliary grid lines are parallel to the long sides of the solar cell piece, and the main grid lines and the auxiliary grid lines are vertically crossed and electrically connected.

[0008] Preferably, the size of the solar cell piece is 182 mm x 210 mm.

[0009] Preferably, the number of the main grid lines is 18-22, and the interval between two main grid lines is 9-12mm.

[0010] Preferably, the interval of the main grid lines is 8-12 times of the interval of the auxiliary grid lines.

[0011] Preferably, the main grid lines are spaced apart along the length direction and have several pads.

[0012] Preferably, the pad is a rectangular structure, and the center line coincides with the main grid line.

[0013] Preferably, the solar cell piece is provided with several fish-tail lines on the long side, the main grid line is connected with the fish-tail line through the pad, and the auxiliary grid line penetrates the fish-tail line.

[0014] Preferably, two rows of fish-tail lines are symmetrically arranged on both sides of the width center line of the solar cell piece, the two rows of fish-tail lines are connected with the main grid line through the pad, and the auxiliary grid line penetrates the fish-tail line.

[0015] Preferably, the fish-tail line is a width gradient structure with a narrow bottom opening and a wide width.

[0016] Preferably, the opening width of the fish-tail line is 1-2mm, and the height of the fish-tail line is 3-6mm.

[0017] The above technical scheme has the following beneficial effects:

[0018] The solar cell piece is designed as a rectangular structure, and the layout of the assembly is changed by adjusting the printing pattern structure of the cell piece, so as to form a new assembly version.

[0019] The traditional square cell piece does not affect the arrangement of the cell piece in the assembly due to the same length of the four sides and different printing directions of the grid lines. The rectangular cell piece has long sides and short sides due to the inconsistent length of the four sides, and the printing direction of the grid lines affects the arrangement of the cell piece in the assembly. At present, the printing direction of the grid lines of the rectangular cell 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 assembly version, cannot effectively improve the conversion efficiency of the assembly, and cannot better meet the market demand.

[0020] In order to improve the power of the solar assembly, the distribution of the main grid lines can be optimized, a new arrangement method is formed by changing the printing of the cell piece, since the main grid line is parallel to the short side of the solar cell piece, and the auxiliary grid line is parallel to the long side of the solar cell piece, in this way, the arrangement length of the main grid line can be increased, thereby increasing the number of the main grid lines, improving the current collection capacity, and further improving the power of the solar assembly.

[0021] Taking the solar cell piece size of 182mm*210mm as an example, the number of main grid lines is 18-22, and the interval between the adjacent two main grid lines is 9-12mm, if the number of main grid lines is too much, the current collection capacity improvement effect is not obvious, and the cost is increased, therefore, the design increases the number of main grid lines, improves the current collection capacity, and avoids excessive increase of cost.

[0022] The features and advantages of the present application will be described in detail in the following specific embodiments and drawings.

DRAWINGS

[0023] The utility model will be further described in connection with the drawings:

[0024] Figure 1 It is the plan view of solar cell module;

[0025] Figure 2 It is the schematic diagram of photovoltaic array formed by transversely adjacent two solar cell pieces through bus bar electric connection;

[0026] Figure 3 It is the schematic diagram of photovoltaic array formed by longitudinally adjacent two solar cell pieces through interconnection strip electric connection;

[0027] Figure 4 It is the cell piece array diagram formed by series connection of each cell piece;

[0028] Figure 5 It is the packaging structure diagram of solar cell piece;

[0029] Figure 6 It is the plan view of solar cell piece;

[0030] Figure 7 It is the enlarged view of A in 6;

[0031] Figure 8 It is the enlarged view of B in 6;

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

CONCRETE IMPLEMENTATION

[0033] The technical scheme of the utility model embodiment will be explained and described in connection with the drawings of the utility model embodiment, but the following embodiment is only the preferred embodiment of the utility model, and is not all.Based on the embodiment in the embodiment, other embodiments obtained by the person skilled in the art without making creative labor all belong to the protection scope of the utility model.

[0034] It is understood by those skilled in the art that the features in the following examples and embodiments can be combined with each other without conflict.

[0035] The terms used in the present application are merely for the purpose of describing specific embodiments and are not intended to limit the present application. For example, the words "upper", "lower", "inner", "outer", "longitudinal", "transverse" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the device / element indicated to have a specific orientation or be constructed and operated in a specific orientation.

[0036] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0038] The present embodiment changes the shape of the solar cell sheet, i.e. designs the solar cell sheet as a rectangular structure, and changes the layout of the assembly by adjusting the printed pattern structure of the cell sheet, thereby forming a new assembly version to improve the power of the solar assembly.

[0039] Reference Figure 1 and Figure 6 As shown in FIG. 1, a solar cell assembly includes a solar cell sheet array and a packaging structure, wherein the solar cell sheet array is in a rectangular structure, i.e. a rectangular array, formed by arranging a plurality of solar cell sheets 1, the solar cell sheet is provided with a screen printing pattern structure, and each cell sheet is connected in series. Wherein the solar cell sheet 1 is a rectangular structure, the solar cell sheet array is also a rectangular structure, and the long side A3 of the solar cell sheet is parallel to the short side A1 of the solar cell assembly, and the short side A4 of the solar cell sheet is parallel to the long side A2 of the solar cell assembly.

[0040] Since the solar cell piece is designed as a rectangular structure, the existing slicing equipment does not need to be changed, only the slicing parameters need to be adjusted to change the slicing shape, thus maximizing the power of the assembly while reducing the demand for equipment modification and investment in new equipment.

[0041] The present embodiment applies the rectangular cell piece to the assembly, in order to improve the power of the solar assembly, the distribution of the main grid lines can be optimized, and a new arrangement can be formed by changing the printing of the cell piece. As shown in Figures 6 to 8 The screen printing pattern structure on the solar cell piece 1 includes a plurality of parallel main grid lines 11 and a plurality of parallel auxiliary grid lines 12, the plurality of main grid lines 11 are parallel to the short side of the solar cell piece, the plurality of auxiliary grid lines 12 are parallel to the long side of the solar cell 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 cell piece and the auxiliary grid lines are parallel to the long side of the solar cell 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 assembly. Using the cell piece with this grid line distribution, more panel types and high-conversion-efficiency assemblies can be designed through series and parallel connection, better meeting market demand.

[0042] When the solar cell piece array is arranged in an equidistant manner, the cell pieces are arranged in a preset array form during use. As shown in Figure 2 Two adjacent solar cell pieces in the lateral direction 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 cell pieces and the back surface of the second row of cell pieces are provided with electrodes, and the electrodes of the front surface of the adjacent first cell piece and the back surface of the adjacent second cell piece are welded together through the interconnection strip 16, and each cell piece is connected in series to form a cell piece array as shown in Figure 4 .

[0043] As shown in Figure 5 The packaging structure includes a first layer of glass 3, a first layer of adhesive film 2 on the upper side of the solar cell piece array, and a second layer of adhesive film 4 and a second layer of glass 5 on the lower side of the solar cell piece array, which are laminated on the cell piece array after packaging is completed, thereby forming a solar assembly. 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 packaging 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 EVA / POE / EVA co-extrusion adhesive film packaging scheme, which takes into account the high water resistance and high PID resistance of the POE adhesive film, and also has the high yield of the double-glass assembly laminated with the EVA adhesive film. The process characteristics fix the cell piece array and the glass plate, increasing the reliability of the product.

[0044] In the embodiment, the size of the solar cell module is 1303mmx2465mm, the cell array is arranged in a 6x13 array, and the size of the single cell is 182mmx210mm. The arrangement can increase the power of the module, improve the efficiency of the module, and reduce the application cost.

[0045] For example, the size of the solar cell is 182mmx210mm. The number of the main grid lines 11 is 18-22, the distance between two main grid lines is 9-12mm, and the distance between the main grid lines is 8-12 times the distance between the auxiliary grid lines. If the number of the main grid lines is too large, the current collection capacity will not be improved obviously, and the cost will be increased. Therefore, the design can increase the number of the main grid lines, improve the current collection capacity, and avoid increasing the cost.

[0046] In combination with the other structures of the screen printing pattern structure in the prior art, the main grid lines 11 are spaced apart along the length direction and have a plurality of pads 13. The pads are rectangular structures, and the center line coincides with the main grid line. The solar cell has a plurality of fish-tail lines 14 on the long side, and the end of the main grid line is connected to the fish-tail line through the pad. The fish-tail lines are symmetrically arranged on both sides of the width center line of the solar cell, and the 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 the hidden cracks of the module and the broken fish-tail line. In addition, the fish-tail line has a width gradient structure with a narrow 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 is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this. Those 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 embodiment. Any modification without deviating from the function and structural principle of the utility model will be included in the scope of the claims.

Claims

1. A solar cell having a screen-printed pattern structure, characterized in that: The solar cell has a rectangular structure, and the screen-printed graphic structure includes a plurality of mutually parallel main grid lines and a plurality of mutually parallel auxiliary grid lines, wherein the main grid lines are parallel to the short sides of the solar cell, the auxiliary grid lines are parallel to the long sides of the solar cell, and the main grid lines and the auxiliary grid lines are vertically crossed and electrically connected.

2. A solar cell according to claim 1, characterized in that: The size of the solar cell is 182 mm×210 mm.

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

4. A solar cell according to claim 3, characterized in that: The spacing between the main grid lines is 8 to 12 times that between the auxiliary grid lines.

5. The solar cell according to claim 1, characterized in that: The main grid line is provided with a plurality of pads spaced apart along the length direction.

6. The solar cell according to claim 5, characterized in that: The pad is a rectangular structure, and the center line coincides with the main grid line.

7. The solar cell according to claim 5, characterized in that: A plurality of harpoon wires are arranged on the long sides of the solar cell sheets, the main grid wires are connected to the harpoon wires through welding pads, and the auxiliary grid wires pass through the harpoon wires.

8. The solar cell according to claim 5, characterized in that: Two rows of harpoon wires are symmetrically arranged on both sides of the width midline in the middle of the width of the solar cell. The two rows of harpoon wires are connected to the main grid wires through welding pads, and the auxiliary grid wires pass through the harpoon wires.

9. A solar cell according to claim 7 or 8, characterized in that: The harpoon line has a gradually changing width structure with a narrow bottom and a wide opening.

10. The solar cell according to claim 9, characterized in that: The opening width of the harpoon line is 1 to 2 mm, and the height of the harpoon line is 3 to 6 mm.

Images