Photovoltaic cell piece with high conversion efficiency and photovoltaic module
By abolishing the main gate lines and welding blocks of the photovoltaic cell and adopting specific fine gate lines and connecting lines designs, the problems of low conversion efficiency, high cost and easy overlap offset of the connecting lines are solved, and high conversion efficiency and low cost photovoltaic cell is achieved.
Patent Information
- Application Number
- CN202421566344.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-04
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-07-04
AI Technical Summary
The surface design of existing photovoltaic cells has problems such as low conversion efficiency, high cost and easy overlapping offset of the connecting wire.
A photovoltaic cell with high conversion efficiency is designed, the main gate line and welding block are abolished on the surface, and thin gate lines parallel to each other in the first direction are used, and two adjacent rows of thin gate lines are connected through the connecting line. The cross-sectional area of at least one end of the connecting line is greater than the cross-sectional area in the middle.
By abolishing the main gate line and welding block, the effective light receiving area of the photovoltaic cell is increased, the conversion efficiency is improved, the silver consumption is saved, the cost is reduced, and the overlapping problem of connecting lines is improved, and the yield of production and manufacturing is improved.
Smart Images
Figure CN222840023U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic power generation, in particular to a photovoltaic cell sheet and a photovoltaic assembly with high conversion efficiency. Background Art
[0002] Photovoltaic modules play an important role in the photovoltaic power generation system. They are connected in series to form the entire photovoltaic power generation system. Photovoltaic cells are the smallest power generation unit in photovoltaic modules, which can directly generate electricity. Photovoltaic cell surfaces collect photocurrent through grid electrodes, such as main grid lines and fine grid lines. Grid electrodes are generally made of silver paste and are formed on the surface of photovoltaic cells through screen printing. Different screens can be used for printing according to different graphic designs to form photovoltaic cells with different grid patterns.
[0003] The surface of the existing photovoltaic cell is designed with a number of parallel thin grid lines and a main grid line perpendicular to the thin grid lines. The main grid line and the thin grid lines are connected by connecting wires, and welding blocks are arranged on the main grid line. Figure 1 and Figure 2 , the fine grid lines extending in the horizontal direction are the fine grid lines, and the main grid lines extending in the vertical direction are the main grid lines. The fine grid lines are used to collect photogenerated carriers; the main grid lines are used for current collection; and the welding blocks are used for welding with the welding strips to form a photovoltaic module with multiple photovoltaic cells.
[0004] The surface graphic structure of the above-mentioned photovoltaic cell has three disadvantages: first, the graphic structure is a main grid line to collect photogenerated carriers on the surface of the cell, but the main grid line will increase the shading rate of the front surface of the cell, thereby affecting the cell conversion efficiency; second, the main grid line and welding block in the graphic structure increase the silver consumption of the cell and increase the production cost; third, there is a problem that the connecting wires in the graphic structure are easy to overlap and deviate. Utility Model Content
[0005] The utility model aims to provide a photovoltaic cell and a photovoltaic module with high conversion efficiency, so as to alleviate the technical problems existing in the prior art of low conversion efficiency, high cost or easy overlap and deviation of connecting wires of photovoltaic cells.
[0006] In order to solve the above technical problems, the technical solution provided by the utility model is:
[0007] In a first aspect, a photovoltaic cell with high conversion efficiency provided by an embodiment of the utility model includes a cell body;
[0008] The surface of the battery cell body is provided with a plurality of groups of fine grid lines parallel to each other along a first direction, and each group of the fine grid lines includes a plurality of columns of fine grid lines spaced apart along a second direction, and the second direction is perpendicular to the first direction;
[0009] Among the plurality of columns of the thin gate lines, two adjacent columns of the thin gate lines are connected by a connecting line;
[0010] The cross-sectional area of at least one end of the connecting line is larger than the cross-sectional area of the middle of the connecting line.
[0011] In combination with the first aspect, an embodiment of the present utility model provides a first possible implementation of the first aspect, wherein the cross-sectional areas at both ends of the connecting line are larger than the cross-sectional area in the middle of the connecting line.
[0012] In combination with the first possible implementation of the first aspect, the embodiment of the utility model provides a second possible implementation of the first aspect, wherein the connecting line includes a middle section and two overlapping sections, and the two overlapping sections are respectively connected to two ends of the middle section;
[0013] The cross-sectional areas of the two overlapping sections gradually increase from one end close to the middle section to one end far away from the middle section.
[0014] In combination with the second possible implementation of the first aspect, an embodiment of the utility model provides a third possible implementation of the first aspect, wherein the thin gate lines extend in a straight line.
[0015] In combination with the third possible implementation manner of the first aspect, an embodiment of the utility model provides a fourth possible implementation manner of the first aspect, where a plurality of columns of fine gate lines in each group of fine gate lines are collinear.
[0016] In combination with the fourth possible implementation of the first aspect, an embodiment of the utility model provides a fifth possible implementation of the first aspect, wherein the middle section extends in a straight line.
[0017] In combination with the fifth possible implementation of the first aspect, an embodiment of the utility model provides a sixth possible implementation of the first aspect, wherein the axis of the middle segment is colinear with the fine grid lines connected thereto.
[0018] In a second aspect, the photovoltaic module provided by the embodiment of the utility model includes a photovoltaic cell with high conversion efficiency as described in any one of the above-mentioned first aspect.
[0019] In combination with the second aspect, a first possible implementation manner of the second aspect provided by an embodiment of the utility model is that a plurality of photovoltaic cells with high conversion efficiency are provided, and the plurality of photovoltaic cells with high conversion efficiency are connected in series.
[0020] In combination with the first possible implementation of the second aspect, the second possible implementation of the second aspect provided by the embodiment of the utility model is that the photovoltaic component includes a photovoltaic welding strip, and the photovoltaic welding strip is installed between two adjacent photovoltaic cells with high conversion efficiency.
[0021] Based on the above technical solutions, the technical effects that can be achieved by the present invention are analyzed as follows:
[0022] The photovoltaic cell with high conversion efficiency provided by the utility model comprises a cell body; the surface of the cell body is provided with a plurality of groups of fine grid lines parallel to each other along a first direction, and each group of fine grid lines comprises a plurality of columns of fine grid lines spaced along a second direction, and the second direction is perpendicular to the first direction; in the plurality of columns of fine grid lines, two adjacent columns of fine grid lines are connected by connecting lines; the cross-sectional area of at least one end of the connecting line is larger than the cross-sectional area in the middle of the connecting line. When the photovoltaic cell with high conversion efficiency is applied, a photovoltaic cell with high conversion efficiency without a main grid is prepared into a photovoltaic module by using a photovoltaic welding strip. The cell body eliminates the main grid line and the welding block provided on the main grid line, increases the effective light receiving area of the entire photovoltaic cell, improves the conversion efficiency of the photovoltaic cell; and saves the silver consumption, and reduces the cost of the photovoltaic cell. The cross-sectional area of at least one end of the connecting line in the cell body is larger than the cross-sectional area in the middle of the connecting line, increases the contact area between at least one end of the connecting line and the fine grid line, thereby improving the problem of overlap offset and improving the yield rate of production and manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 It is a schematic diagram of the structure of a photovoltaic cell in the prior art;
[0025] Figure 2 for Figure 1 A partial enlarged view of the middle A;
[0026] Figure 3 A schematic diagram of the structure of a photovoltaic cell with high conversion efficiency provided by an embodiment of the utility model;
[0027] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;
[0028] Figure 5 A schematic diagram of the structure of connecting wires in a photovoltaic cell with high conversion efficiency provided by an embodiment of the utility model.
[0029] icon:
[0030] 100 - battery cell body; 110 - fine grid line; 120 - connection line; 121 - middle section; 122 - overlapping section;
[0031] a-first direction; b-second direction. DETAILED DESCRIPTION
[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0035] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0036] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0038] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0039] Embodiment 1
[0040] The surface of the existing photovoltaic cell is designed with a number of parallel thin grid lines and a main grid line perpendicular to the thin grid lines. The main grid line and the thin grid lines are connected by connecting wires, and welding blocks are arranged on the main grid line. Figure 1 and Figure 2 , the fine grid lines extend in the horizontal direction, and the main grid lines extend in the vertical direction. Among them, the fine grid lines are used to collect photogenerated carriers; the main grid lines are used for convergence; the welding blocks are used to weld with the welding strips, so that multiple photovoltaic cells form a photovoltaic module. The surface graphic structure of the above photovoltaic cell has three disadvantages: first, the graphic structure is for the main grid lines to collect photogenerated carriers on the surface of the cell, but the main grid lines will increase the shading rate of the front surface of the cell, thereby affecting the cell conversion efficiency; second, the main grid lines and welding blocks in the graphic structure increase the silver consumption of the cell, increasing the production cost; third, there is a problem that the connecting wires are easily overlapped and offset in the graphic structure.
[0041] In view of this, see Figures 3 to 5 The photovoltaic cell with high conversion efficiency provided by the embodiment of the utility model includes a cell body 100; a surface of the cell body 100 is provided with a plurality of groups of fine grid lines 110 parallel to each other along a first direction a, and each group of fine grid lines 110 includes a plurality of columns of fine grid lines 110 spaced apart along a second direction b, and the second direction b is perpendicular to the first direction a; among the plurality of columns of fine grid lines 110, two adjacent columns of fine grid lines 110 are connected by a connecting line 120; the cross-sectional area of at least one end of the connecting line 120 is larger than the cross-sectional area of the middle of the connecting line 120.
[0042] Specifically, the surface of the cell body 100 is provided with M rows and N columns of fine grid lines 110, and in two adjacent columns, the corresponding two fine grid lines 110 are connected by a connecting line 120. All the fine grid lines 110 extend along the second direction b; the axis of the connecting line 120 extends along the second direction b. When the photovoltaic cell with high conversion efficiency is applied, a photovoltaic cell with high conversion efficiency without a main grid is prepared into a photovoltaic module using a photovoltaic welding tape. The photovoltaic welding tape can be set as a low-temperature welding tape, and the cell body 100 is connected in series using the low-temperature welding tape. The low-temperature welding tape can be welded to the fine grid lines 110 under low temperature conditions to avoid high temperature damage to the cell body 100 due to welding, and reduce the efficiency loss of the cell body 100. It is worth noting that the cell body 100 is set as a square with four sides, and the second direction b can be parallel to any side of the cell body 100.
[0043] The cell body 100 eliminates the main grid line and the welding block provided on the main grid line, increases the effective light receiving area of the entire photovoltaic cell, improves the conversion efficiency of the photovoltaic cell, saves silver consumption, and reduces the cost of the photovoltaic cell. The cross-sectional area of at least one end of the connecting wire 120 in the cell body 100 is larger than the cross-sectional area in the middle of the connecting wire 120, increases the contact area between at least one end of the connecting wire 120 and the fine grid line 110, thereby improving the problem of overlap offset and improving the yield rate of production.
[0044] The following is a detailed description of the structure and shape of photovoltaic cells with high conversion efficiency:
[0045] In an optional solution of the embodiment of the present utility model, the cross-sectional areas at both ends of the connecting line 120 are larger than the cross-sectional area in the middle of the connecting line 120 .
[0046] Specifically, the cross-sectional area of the connection line 120 refers to the area of a plane figure formed after the connection line 120 is cut along a plane perpendicular to the axis of the connection line 120 .
[0047] The cross-sectional areas at both ends of the connecting line 120 are larger than the cross-sectional area in the middle of the connecting line 120 , which increases the contact area between the connecting line 120 and the two fine gate lines 110 connected thereto, thereby improving the overlap offset problem and further improving the production yield.
[0048] In an optional scheme of an embodiment of the utility model, the connecting line 120 includes a middle section 121 and two overlapping sections 122, and the two overlapping sections 122 are respectively connected to the two ends of the middle section 121; the cross-sectional areas of the two overlapping sections 122 gradually increase from one end close to the middle section 121 to the end far away from the middle section 121.
[0049] Specifically, the two ends of the middle section 121 are integrally formed with the two overlapping sections 122. Figure 5, the overlapping section 122 is trapezoidal, and the short side of the trapezoid is connected to the middle section 121. Furthermore, the size and shape of the two overlapping sections 122 are the same; of course, the size of the two overlapping sections 122 is different, but the structure that the cross-sectional area of the overlapping section 122 gradually increases from the end close to the middle section 121 to the end far from the middle section 121 should also be within the protection scope of the embodiment of the utility model.
[0050] The cross-sectional area of the overlapping section 122 gradually increases from one end close to the middle section 121 to the end farthest from the middle section 121, so that the cross-sectional areas at both ends of the connecting section are larger than the cross-sectional area in the middle of the connecting section, thereby increasing the contact area between the connecting line 120 and the two fine gate lines 110 connected thereto, thereby improving the problem of overlapping offset and further improving the yield of production. In addition, because the cross-sectional area of the overlapping section 122 gradually increases, the problem of easy breakage at the enlarged portion due to a sudden increase in the cross-sectional area of the connecting line 120 is avoided.
[0051] In an optional solution of the embodiment of the present invention, the thin gate line 110 extends in a straight line.
[0052] Specifically, the fine grid lines 110 are printed conductors. In this embodiment, the fine grid lines 110 are extended in a straight line direction, that is, the fine grid lines 110 are arranged in a straight line, and each group of fine grid lines 110 is arranged in parallel. Of course, the fine grid lines 110 can also be in an arc shape, a fold line shape, or a curve shape.
[0053] The fine grid lines 110 extend in a straight line, which reduces the area occupied by the fine grid lines 110, increases the effective light-receiving area of the entire photovoltaic cell, and improves the conversion efficiency of the photovoltaic cell; it also saves silver consumption and reduces the cost of the photovoltaic cell.
[0054] In an optional solution of the embodiment of the present utility model, a plurality of columns of fine gate lines 110 in each group of fine gate lines 110 are collinear.
[0055] Specifically, see Figure 4 The multiple columns of fine gate lines 110 in each group of fine gate lines 110 are on the same horizontal line, that is, the multiple columns of fine gate lines 110 in the same group can be connected to form a straight line extending along the second direction b from the height point of view.
[0056] Multiple fine grid lines 110 in the same group are colinear, which is convenient for processing and manufacturing; and, according to the Pythagorean theorem, the length of the right angle side is less than the length of the hypotenuse, so this setting can reduce the gap between two adjacent fine grid lines 110, thereby reducing the length of the connecting section, thereby increasing the effective light-receiving area of the entire photovoltaic cell and improving the conversion efficiency of the photovoltaic cell; it also saves silver consumption and reduces the cost of the photovoltaic cell.
[0057] In an optional solution of the embodiment of the present utility model, the middle section 121 extends in a straight line.
[0058] Specifically, the length of the middle segment 121 is much smaller than the length of each thin gate line 110 , and the width of the middle segment 121 may be larger than the width of the thin gate line 110 .
[0059] The middle section 121 extends in a straight line, which reduces the area occupied by the middle section 121, increases the effective light-receiving area of the entire photovoltaic cell, and improves the conversion efficiency of the photovoltaic cell; it also saves silver consumption and reduces the cost of the photovoltaic cell.
[0060] In an optional solution of the embodiment of the present utility model, the axis of the middle section 121 is colinear with the fine grid line 110 connected thereto.
[0061] Specifically, the axis of the overlapping section 122 is colinear with the axis of the middle section 121 .
[0062] The axis of the middle section 121 is collinear with the fine grid line 110 , so that the axis of the overlapping section 122 of the connecting line 120 is collinear with the axis of the fine grid line 110 , and then both sides of the overlapping section 122 protrude from the fine grid line 110 , so that the two are stably connected.
[0063] Embodiment 2
[0064] The photovoltaic module provided in the embodiment of the utility model includes the photovoltaic cell with high conversion efficiency described in the first embodiment, and therefore, also has all the beneficial effects in the first embodiment, which will not be described in detail here.
[0065] In an optional solution of the embodiment of the utility model, a plurality of photovoltaic cells with high conversion efficiency are provided, and the plurality of photovoltaic cells with high conversion efficiency are connected in series.
[0066] Multiple photovoltaic cells with high conversion efficiency are connected in series to form a photovoltaic module, which can generate electricity.
[0067] In an optional solution of the embodiment of the utility model, the photovoltaic assembly includes a photovoltaic welding strip, and the photovoltaic welding strip is installed between two adjacent photovoltaic cells with high conversion efficiency.
[0068] Specifically, the photovoltaic welding ribbon can be set as a low-temperature welding ribbon, and the battery cell body 100 is connected in series using the low-temperature welding ribbon. The low-temperature welding ribbon can be welded to the fine grid line 110 under low temperature conditions to avoid high temperature damage to the battery cell body 100 due to welding, thereby reducing the efficiency loss of the battery cell body 100.
[0069] Photovoltaic cells with high conversion efficiency can significantly reduce the amount of battery silver paste used by removing the main grid line and welding block, thereby reducing costs. Photovoltaic modules use low-temperature welding strips to replace the main grid lines of solar cells. The welding strips are pre-fixed on photovoltaic cells with high conversion efficiency, and low-temperature welding of the welding strips and photovoltaic cells with high conversion efficiency is achieved during the module lamination process. While connecting multiple photovoltaic cells with high conversion efficiency into a battery string, the welding strips replace the main grid lines to collect the current on the fine grid lines 110. The more welding strips there are, the better the current collection effect is, and the module will have higher power and better performance.
[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A photovoltaic cell with high conversion efficiency, characterized in that: include: Battery cell body (100); The surface of the battery cell body (100) is provided with a plurality of groups of fine grid lines (110) parallel to each other along a first direction (a), and each group of the fine grid lines (110) includes a plurality of columns of fine grid lines (110) spaced apart along a second direction (b), and the second direction (b) is perpendicular to the first direction (a); Among the plurality of columns of fine gate lines (110), two adjacent columns of fine gate lines (110) are connected via a connecting line (120); The cross-sectional area of at least one end of the connecting line (120) is larger than the cross-sectional area of the middle of the connecting line (120).
2. The photovoltaic cell with high conversion efficiency according to claim 1, characterized in that: The cross-sectional areas at both ends of the connecting line (120) are greater than the cross-sectional area in the middle of the connecting line (120).
3. The photovoltaic cell with high conversion efficiency according to claim 2, characterized in that: The connecting line (120) comprises a middle section (121) and two overlapping sections (122), and the two overlapping sections (122) are respectively connected to two ends of the middle section (121); The cross-sectional areas of the two overlapping sections (122) gradually increase from one end close to the middle section (121) to one end far away from the middle section (121).
4. The photovoltaic cell with high conversion efficiency according to claim 3, characterized in that: The fine grid lines (110) extend in a straight line.
5. The photovoltaic cell with high conversion efficiency according to claim 4, characterized in that: A plurality of columns of fine gate lines (110) in each group of fine gate lines (110) are collinear.
6. The photovoltaic cell with high conversion efficiency according to claim 5, characterized in that: The middle section (121) extends in a straight line.
7. The photovoltaic cell with high conversion efficiency according to claim 6, characterized in that: The axis of the middle section (121) is colinear with the fine grid line (110) connected thereto.
8. A photovoltaic module, characterized in that: A photovoltaic cell with high conversion efficiency comprising the photovoltaic cell according to any one of claims 1 to 7.
9. The photovoltaic module according to claim 8, characterized in that: The photovoltaic cells with high conversion efficiency are provided in plurality, and the plurality of photovoltaic cells with high conversion efficiency are connected in series.
10. The photovoltaic module according to claim 9, characterized in that: The photovoltaic assembly comprises a photovoltaic welding strip, and the photovoltaic welding strip is installed between two adjacent photovoltaic cells with high conversion efficiency.