Main grid structure of solar cell
By setting up a current collection structure at both ends of the main gate line of the battery cell, the problem of insufficient current collection ability in the TOPCON battery is solved, and the energy conversion efficiency and service life of the battery cell are improved.
Patent Information
- Application Number
- CN202422425644.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-09
AI Technical Summary
The harpoon-type grid line design of existing TOPCON batteries leads to limited current collection ability, low grayscale value of the battery cell, and black color, which affects battery efficiency and service life.
Current collection structures are arranged at both ends of the main gate line of the battery cell, including the collection main line and the collection line group. Through these structures, the current collection ability is increased and the current collection probability and energy conversion efficiency in the blank area are improved.
It improves the current collection ability, enhances the energy conversion efficiency of the blank area, improves the yield and service life of the battery cell, and reduces the situation of blackening of the gate wire.
Smart Images
Figure CN223219424U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of solar cells, and in particular to a main grid structure of a solar cell. Background Art
[0002] In the rapidly developing photovoltaic industry, new solar cell technologies are constantly emerging, resulting in continuous improvements in cell power generation efficiency and significant reductions in the costs of cells, modules, and systems. This continuous cost reduction and efficiency improvement are bringing photovoltaic power generation ever closer to grid parity. To achieve high voltage and current output, multiple cells are typically connected in series or parallel to form a module, using solder ribbons soldered to the silver busbar printed on the cell surface. The photocurrent generated by the cells in response to sunlight is then collected through the grid lines and solder ribbons for output power.
[0003] The silkscreen process plays a crucial role in the TOPCON battery manufacturing process. The grid lines used in this process are crucial for the battery's conversion efficiency, yield, and power. The silkscreen end of an N-type TOPCON battery typically features a harpoon printed between the two edges of the cell, collecting and transmitting current. However, the distance between the two grid lines of the harpoon is large, limiting its current collection capacity. Testing reveals that the cell at the harpoon location has a low grayscale value and a dark color.
[0004] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Utility Model Content
[0005] The embodiments of the present application provide a main grid structure of a solar cell to solve or alleviate one or more technical problems mentioned above.
[0006] As one aspect of an embodiment of the present application, an embodiment of the present application provides a busbar structure of a solar cell, which is provided on the light-receiving surface of a cell body, and is characterized in that the busbar structure includes:
[0007] A main grid line includes a first end and a second end opposite to each other, wherein the first end and the second end are both provided with a first collecting grid line and a second collecting grid line; a blank area is formed between the first collecting grid line and the second collecting grid line located at the same end, and a current collecting structure is provided in each of the blank areas; wherein the current collecting structure, the first collecting grid line and the second collecting grid line are all electrically connected to the main grid.
[0008] Optionally, the current collection structure includes a main collection line and a branch collection line group, one end of the main collection line is electrically connected to the main grid line, and the other end is electrically connected to the branch collection line group;
[0009] Wherein, the collecting branch line group includes a number of collecting sub-lines.
[0010] Optionally, the collecting branch line group includes a first collecting sub-line, a second collecting sub-line, and a third collecting sub-line; one end of the first collecting sub-line, the second collecting sub-line, and the third collecting sub-line are respectively electrically connected to the collecting main line, and the other ends extend away from the collecting main line, and the second collecting sub-line is located between the first collecting sub-line and the third collecting sub-line;
[0011] The first collecting sub-line, the second collecting sub-line, the third collecting sub-line, the first collecting gate line and the second collecting gate line are all located on the same straight line at their ends away from the main gate line.
[0012] Optionally, the first collecting gate line and the second collecting gate line are symmetrically arranged with the collecting main line as the symmetry axis; the first collecting sub-line and the third collecting sub-line are symmetrically arranged with the second collecting sub-line as the symmetry axis.
[0013] Optionally, the current collection structure includes a main gate branch line, one end of the main gate branch line is electrically connected to the main gate line, and the other end extends in a direction away from the main gate line.
[0014] Optionally, the current collection structure further includes a first sub-line and a second sub-line; one end of each of the first sub-line and the second sub-line is electrically connected to the main gate branch line, and the other end extends in a direction away from the main gate branch line;
[0015] Wherein, the first sub-line, the second sub-line, the first collecting gate line and the second collecting gate line are all located on the same straight line at ends away from the main gate line.
[0016] Optionally, the ends of the main gate branch line, the first collecting gate line, and the second collecting gate line away from the main gate line are all located on the same straight line.
[0017] Optionally, the first collecting gate line and the second collecting gate line are symmetrically arranged with the main gate line as a symmetry axis.
[0018] Optionally, the width of the blank area formed between the first collecting gate line and the second collecting gate line gradually increases in a direction away from the main gate line.
[0019] Optionally, a welding block is provided on the main grid line, and the first collecting grid line and the second collecting grid line are electrically connected to the main grid line through the welding block.
[0020] The above technical solution adopted in the embodiments of the present application may have the following advantages:
[0021] By setting a current collection structure in the blank area of the first collection gate line and the second collection gate line, the current collection capability is further increased. While the current collection structure assists the first collection gate line and the second collection gate line in collecting current, it also further increases the probability of collecting current in the blank area, and also increases the energy conversion efficiency in the blank area, thereby improving the battery efficiency and improving the battery cell yield; in addition, it also effectively improves the blackening of the first collection gate line and the second collection gate line, thereby increasing the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.
[0023] Figure 1 Schematic diagram of the main grid structure of a solar cell in the first embodiment of the present application.
[0024] Figure 2 Schematic diagram of the main grid structure of a solar cell in the second embodiment of the present application.
[0025] Figure 3 Schematic diagram of the main grid structure of a solar cell in the third embodiment of the present application.
[0026] Description of reference numerals:
[0027] 1. Main grid line; 11. Main grid branch line; 12. First sub-line; 13. Second sub-line; 21. Collecting main line; 22. First collecting sub-line; 23. Second collecting sub-line; 24. Third collecting sub-line; 3. First collecting grid line; 4. Second collecting grid line; 5. Blank area; 6. Welding block. DETAILED DESCRIPTION
[0028] In order to make the objectives, technical solutions, and advantages of this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and examples. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict. This application will be described in detail below with reference to the accompanying drawings and in conjunction with the examples.
[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0030] Hereinafter, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. It should be noted that these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein.
[0031] like Figure 1-3 As shown, the first embodiment of the present application is as follows: Figure 1 As shown, the main grid structure of the solar cell is arranged on the light-receiving surface of the cell. The main grid line 1 includes a first end and a second end opposite each other, and the first end and the second end are both provided with a first collecting grid line 3 and a second collecting grid line 4. A blank area 5 is formed between the first collecting grid line 3 and the second collecting grid line 4 located at the same end, and each blank area 5 is provided with a current collection structure. In the embodiment of the present application, the first collecting grid line 3 and the second collecting grid line 4 are symmetrically arranged along the direction of the main grid line 1. Among them, the current collection structure, the first collecting grid line 3 and the second collecting grid line 4 are all electrically connected to the main grid.
[0032] In this embodiment, the current collection capability is further increased by providing a current collection structure in the blank area 5 of the first collection gate line 3 and the second collection gate line 4. The current collection structure assists the first collection gate line 3 and the second collection gate line 4 in collecting current, while further increasing the probability of collecting current in the blank area 5 and the energy conversion efficiency in the blank area 5, thereby improving the battery efficiency and the cell yield. In addition, the blackening of the first collection gate line 3 and the second collection gate line 4 is effectively improved, thereby increasing the battery life.
[0033] In an optional embodiment, the current collection structure includes a main collection line 21 and a collection branch line group, wherein one end of the main collection line 21 is electrically connected to the busbar line 1, and the other end is electrically connected to the collection branch line group. The collection branch line group includes a plurality of collection sub-lines, each of which is electrically connected to the main collection line 21. In the embodiment of the present application, the main collection line 21 and the busbar line 1 are on the same straight line.
[0034] In this embodiment, both the main collection line 21 and the collection branch line group are located in the blank area 5, which greatly increases the upper limit of current collection in the blank area 5 and improves the energy conversion efficiency in the blank area 5. It should be noted that there is no limit on the number of collection sub-lines. Theoretically, the greater the number of collection sub-lines, the stronger the current collection capability in the blank area 5 and the higher the energy conversion efficiency. This effectively improves the blackening of the first collection grid lines 3 and the second collection grid lines 4, thereby extending the battery life.
[0035] In an optional embodiment, the collection sub-line group includes a first collection sub-line 22, a second collection sub-line 23, and a third collection sub-line 24; one end of the first collection sub-line 22, the second collection sub-line 23, and the third collection sub-line 24 are respectively electrically connected to the collection main line 21, and the other end extends away from the collection main line 21, and the second collection sub-line 23 is located between the first collection sub-line 22 and the third collection sub-line 24. The ends of the first collection sub-line 22, the second collection sub-line 23, the third collection sub-line 24, the first collection grid line 3, and the second collection grid line 4 away from the main grid line 1 are all on the same straight line. In the embodiment of the present application, the first collection sub-line 22, the second collection sub-line 23, and the third collection sub-line 24 form an angle with each other, and the degree of the angle is the same.
[0036] In this embodiment, the first collecting sub-lines 22, the second collecting sub-lines 23 and the third collecting sub-lines 24 form an angle with each other, and the degrees of the angles are the same. The first collecting sub-lines 22, the second collecting sub-lines 23 and the third collecting sub-lines 24 are distributed more evenly in the blank area 5 and can cover the entire blank area 5, and the collection current efficiency and upper limit are higher.
[0037] In an optional embodiment, the first collecting gate line 3 and the second collecting gate line 4 are symmetrically arranged with the collecting main line 21 as the symmetry axis; the first collecting sub-line 22 and the third collecting sub-line 24 are symmetrically arranged with the second collecting sub-line 23 as the symmetry axis.
[0038] In this embodiment, since the first collecting gate line 3 and the second collecting gate line 4 are symmetrically arranged with the collecting main line 21 as the symmetry axis, the first collecting sub-lines 22, the second collecting sub-lines 23 and the third collecting sub-lines 24 can be evenly distributed in the blank area 5, thereby improving the current collection capability.
[0039] In an optional embodiment, the width of the blank area 5 formed between the first collecting gate line 3 and the second collecting gate line 4 gradually increases in a direction away from the busbar line 1. A welding block 6 is provided on the busbar line 1, and the first collecting gate line 3 and the second collecting gate line 4 are electrically connected to the busbar line 1 through the welding block 6.
[0040] In this embodiment, the gradual increase in the size of the blank area 5 reduces light reflection back into the air or dielectric, allowing light to penetrate deeper into the battery, improving light absorption and photoelectric conversion efficiency. It also reduces electron recombination and loss caused by surface defects (such as blemishes or dirt), thereby improving battery efficiency. It also more effectively distributes the electric field, improving charge separation efficiency and the battery's current collection capacity. Furthermore, the solder bumps 6 provide a physically secure connection that resists vibration and stress that the battery may experience during operation, ensuring the connection will not loosen or break.
[0041] like Figure 2 As shown, the second embodiment of the present application is different from the other embodiments in that the current collection structure includes a main gate branch 11, one end of the main gate branch 11 is electrically connected to the main gate 1, and the other end extends in a direction away from the main gate 1. The main gate branch 11, the first collection gate line 3 and the second collection gate line 4 are all on the same straight line away from the main gate 1. The first collection gate line 3 and the second collection gate line 4 are symmetrically arranged with the main gate branch 11 as the axis of symmetry. In the embodiment of the present application, the main gate branch 11 and the main gate line 1 are on the same straight line, and the main gate branch 11 is located between the first collection gate line 3 and the second collection gate line 4, which can improve the ability to collect current in the blank area 5.
[0042] In this embodiment, the busbar branch 11, first collector grid lines 3, and second collector grid lines 4 form a "harpoon" shape, which increases the current collection area and reduces the resistance through which the current flows, thereby reducing power loss in the circuit. This improves current collection efficiency, particularly under high current density conditions. The harpoon-shaped design also provides better thermal management, more evenly distributing current and heat, and avoiding localized hot spots.
[0043] like Figure 3 As shown, the third embodiment of the present application differs from the other embodiments in that the current collection structure further includes a first sub-line 12 and a second sub-line 13; one end of each of the first sub-line 12 and the second sub-line 13 is electrically connected to the busbar branch 11, and the other end extends away from the busbar branch 11. The first sub-line 12, the second sub-line 13, the first collecting gate line 3, and the second collecting gate line 4 are all located on the same straight line at their ends away from the busbar 1.
[0044] In this embodiment, the first sub-line 12, the second sub-line 13 and the main grid branch line 11 are located in the blank area 5 as a current collection structure, further increasing the current collection area. The setting of the first sub-line 12 and the second sub-line 13 can increase the mechanical strength and stability of the main grid line 1, making it more durable and reliable, especially under conditions of drastic environmental changes.
[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.
[0046] For ease of description, the directions or positional relationships indicated by directional terms such as "front, back, up, down, left, right," "lateral, vertical, perpendicular, horizontal," and "top, bottom" are generally based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional terms do not indicate or imply that the devices or components referred to must have a specific direction or be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of this application. The directional terms "inside" and "outside" refer to the inside and outside relative to the outline of the components themselves. For example, if the device in the drawings is inverted, the device described as "above" or "on top of" other devices or structures will be positioned "below" or "below" other devices or structures. Therefore, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.
[0047] Unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.
[0048] 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 not being in direct contact but being in contact via another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or diagonally 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 above or diagonally above the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0049] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.
[0050] It should also be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like throughout this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described herein. The appearance of the same expression in multiple places in this specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also fall within the scope of this application.
[0051] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0052] It should also be noted that the above are only preferred embodiments of the present application and do not limit the scope of patent protection of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present application.
Claims
1. A main grid structure of a solar cell, provided on the light-receiving surface of the cell body, characterized in that: The main grid structure includes: A main grid line (1) comprises a first end and a second end opposite to each other, wherein the first end and the second end are both provided with a first collecting grid line (3) and a second collecting grid line (4); a blank area (5) is formed between the first collecting grid line (3) and the second collecting grid line (4) located at the same end, and a current collecting structure is provided in each of the blank areas (5); Wherein, the current collection structure, the first collection grid line (3) and the second collection grid line (4) are all electrically connected to the main grid line (1).
2. The main grid structure of a solar cell according to claim 1, characterized in that: The current collection structure comprises a main collection line (21) and a collection branch line group, one end of the main collection line (21) is electrically connected to the main grid line (1), and the other end is electrically connected to the collection branch line group; Wherein, the collecting branch line group includes a number of collecting sub-lines.
3. The main grid structure of a solar cell according to claim 2, characterized in that: The collecting branch line group comprises a first collecting sub-line (22), a second collecting sub-line (23) and a third collecting sub-line (24); one end of the first collecting sub-line (22), the second collecting sub-line (23) and the third collecting sub-line (24) are respectively electrically connected to the collecting main line (21), and the other ends extend in a direction away from the collecting main line (21); the second collecting sub-line (23) is located between the first collecting sub-line (22) and the third collecting sub-line (24); The first collecting sub-line (22), the second collecting sub-line (23), the third collecting sub-line (24), the first collecting grid line (3) and the second collecting grid line (4) are all located on the same straight line at their ends away from the main grid line (1).
4. The main grid structure of a solar cell according to claim 3, characterized in that: The first collecting grid line (3) and the second collecting grid line (4) are symmetrically arranged with the collecting main line (21) as the symmetry axis; the first collecting sub-line (22) and the third collecting sub-line (24) are symmetrically arranged with the second collecting sub-line (23) as the symmetry axis.
5. The main grid structure of a solar cell according to claim 1, characterized in that: The current collection structure comprises a main grid branch line (11), one end of the main grid branch line (11) is electrically connected to the main grid line (1), and the other end extends in a direction away from the main grid line (1).
6. The main grid structure of a solar cell according to claim 5, characterized in that: The current collection structure further comprises a first sub-line (12) and a second sub-line (13); one end of each of the first sub-line (12) and the second sub-line (13) is electrically connected to the main grid branch line (11), and the other end extends in a direction away from the main grid branch line (11); The first sub-line (12), the second sub-line (13), the first collecting grid line (3) and the second collecting grid line (4) are all located on the same straight line at their ends away from the main grid line (1).
7. The main grid structure of a solar cell according to claim 5, characterized in that: The ends of the main grid line (11), the first collecting grid line (3), and the second collecting grid line (4) away from the main grid line (1) are all located on the same straight line.
8. The main grid structure of a solar cell according to claim 5, characterized in that: The first collecting grid line (3) and the second collecting grid line (4) are symmetrically arranged with the main grid branch line (11) as a symmetry axis.
9. The main grid structure of a solar cell according to any one of claims 1 to 8, characterized in that: Along the direction away from the main grid line (1), the width of the blank area (5) formed between the first collecting grid line (3) and the second collecting grid line (4) gradually increases.
10. The main grid structure of a solar cell according to any one of claims 1 to 8, characterized in that: A welding block (6) is provided on the main grid line (1), and the first collecting grid line (3) and the second collecting grid line (4) are electrically connected to the main grid line (1) via the welding block (6).