Photovoltaic module and photovoltaic system
By flexibly designing the distance between the solder strip and the edge of the cell, as well as the spacing between adjacent solder strips, the problems of microcracks and electrical losses in the cell caused by solder strip stress were solved, thereby improving the stability and efficiency of the cell.
Patent Information
- Application Number
- CN202423307461.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In the manufacturing process of photovoltaic modules, the distance between the solder ribbon and the edge of the cell is fixed in the existing technology, which leads to large differences in edge stress of cells of different sizes, which can easily cause microcracks or breakage and affect electrical losses.
By designing the distance between the end solder strip and the edge of the cell as d1=W*(A*N+B)+C, which can be flexibly adjusted according to the cell length and the number of solder strips, and combined with the tolerance parameter C, the stress at the edge of the cell is reduced. The distance between adjacent solder strips is designed as d2=(WE*d1)/(N-1) to reduce microcracks and electrical losses in the cell.
It effectively reduces edge stress of solar cells, lowers the risk of microcracks and breakage, and at the same time reduces electrical losses, improving the stability and efficiency of photovoltaic modules.
Smart Images
Figure CN223859545U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to photovoltaic technology field especially relates to photovoltaic module and photovoltaic system. BACKGROUND
[0002] In the process of making photovoltaic module, a plurality of cell pieces need to be connected by welding band to form photovoltaic module.
[0003] The end welding band is the welding band adjacent to the edge of the cell piece, and in the existing scheme, the distance between the edge welding band and the edge of the cell piece is usually fixed, and in the subsequent lamination process, the stress on the edge caused by welding the welding band will be different for different sizes of cell pieces, and when the stress on the edge of the cell piece is large, it will cause the cell piece to crack or break, and also affect the electrical loss of the cell piece. SUMMARY
[0004] The utility model provides a kind of photovoltaic group and photovoltaic system piece, which can reduce the stress on the edge of the cell piece, reduce the risk of cell piece cracking or breaking, and reduce the electrical loss of the cell piece.
[0005] To achieve the above purpose, the utility model adopts the following technical scheme:
[0006] In a first aspect, a photovoltaic module is provided, comprising: a plurality of cell pieces; a plurality of welding bands extending in a first direction and arranged in a second direction, connecting adjacent two cell pieces, the first direction being perpendicular to the second direction; the welding band adjacent to the edge of the cell piece is the end welding band, the edge is parallel to the first direction, and the distance between the end welding band and the edge is d1, d1=W*(A*N+B)+C, W is the length of the cell piece in the second direction, N is the number of welding bands on the cell piece, A and B are preset coefficients, and C is a tolerance parameter.
[0007] Based on this, since the distance between the end welding band and the edge is related to the length of the cell piece in the second direction and the number of welding bands 30 on the cell piece, the distance between the end welding band and the edge can be flexibly designed according to the size of the cell piece and the number of welding bands on the cell piece, thereby reducing the stress on the edge of the cell piece, reducing the risk of cell piece cracking or breaking, and reducing the electrical loss of the cell piece.
[0008] In combination with the first aspect, in some embodiments of the first aspect, -0.002≤A≤-0.0019.
[0009] In combination with the first aspect, in some embodiments of the first aspect, A is -0.001923.
[0010] In combination with the first aspect, in some embodiments of the first aspect, 0.06≤B≤0.061.
[0011] With reference to the first aspect, in some embodiments of the first aspect, B is 0.06033.
[0012] With reference to the first aspect, in some embodiments of the first aspect, -2mm≤C≤2mm.
[0013] With reference to the first aspect, in some embodiments of the first aspect, the distance between two adjacent busbars on the cell is d1, d1=(W-E*C) / (N-1), E is a preset coefficient.
[0014] With reference to the first aspect, in some embodiments of the first aspect, 1≤E≤3.
[0015] With reference to the first aspect, in some embodiments of the first aspect, E is 2.
[0016] The second aspect provides a photovoltaic system comprising the cell assembly provided by the first aspect and any one of the embodiments thereof. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 A structural schematic diagram of the photovoltaic module is provided in the present application. DETAILED DESCRIPTION
[0018] In the description of the present application, unless otherwise specified, "a plurality of" means two or more than two. "At least one of the following" or the like means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b, or c can mean a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, and c can be single or multiple.
[0019] In addition, in order to facilitate the clear description of the technical scheme of the embodiments of the present application, in the embodiments of the present application, the same items or similar items with basically the same function and role are distinguished by using "first", "second" and the like. Those skilled in the art can understand that "first", "second" and the like do not limit the quantity and execution order, and "first", "second" and the like do not necessarily mean different.
[0020] Meanwhile, in the embodiments of the present application, "exemplary" or "for example" and the like are used to represent as an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" and the like is intended to present the relevant concept in a specific manner, so as to facilitate understanding.
[0021] It can be understood that the "embodiments" mentioned throughout the specification mean that the specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the utility model. Therefore, the various embodiments throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It can be understood that in various embodiments of the utility model, the size of the sequence of each process does not mean the order of execution, and the execution order of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the utility model.
[0022] It can be understood that in the utility model, "when", "if" and "if" all refer to the corresponding processing under certain objective circumstances, not limited by time, and do not require judgment action when implementing, nor mean that there are other limitations.
[0023] It can be understood that some optional features in the embodiments of the utility model can be implemented independently in some scenarios without relying on other features, such as the current scheme based on, to solve the corresponding technical problems and achieve the corresponding effect. Also, in some scenarios, it can be combined with other features according to demand. Correspondingly, the devices given in the embodiments of the utility model can also realize these features or functions, which will not be described here.
[0024] In the utility model, except for special description, the same or similar parts between various embodiments can be mutually referred to. In various embodiments of the utility model, and various implementation methods in each embodiment, if there is no special description and logic conflict, the terms and / or descriptions between different embodiments, and various implementation methods in each embodiment are consistent and can be mutually referred to. The technical features in different embodiments, and various implementation methods in each embodiment can be combined to form new embodiments, implementation modes, implementation methods, or implementation methods according to their inherent logical relationship. The following utility model implementation mode does not constitute a limitation on the protection scope of the utility model.
[0025] In the process of making a photovoltaic module, a plurality of cell pieces need to be connected by welding strips to form a photovoltaic module.
[0026] The end welding strip is the welding strip adjacent to the edge of the cell piece. In the existing scheme, the distance between the edge welding strip and the edge of the cell piece is usually fixed. In the subsequent lamination process, the stress on the edge caused by welding the welding strip will be different for different sizes of cell pieces. When the stress on the edge of the cell piece is large, it will cause the cell piece to crack or break.
[0027] To solve the above problems, the utility model provides a photovoltaic module, Figure 1A schematic diagram of the structure of a photovoltaic module provided by this utility model is shown below. Figure 1 As shown, the photovoltaic module 10 includes: multiple solar cells 20; multiple solder strips 30 extending along a first direction and arranged along a second direction to connect two adjacent solar cells 20, the first direction being perpendicular to the second direction; the solder strips 30 adjacent to the edge of the solar cell 20 are end solder strips, the edge being parallel to the first direction, the distance between the end solder strip and the edge being d1, d1=W*(A*N+B)+C, where W is the length of the solar cell 20 in the second direction, N is the number of solder strips 30 on the solar cell 20, A and B are preset coefficients, and C is a tolerance parameter.
[0028] The solder strip 30 can be lead-tinned copper solder strip, lead-silver-tinned copper solder strip, or lead-free environmentally friendly tinned copper solder strip. Of course, the solder strip 30 can also be other types of solder strips, and this utility model does not impose specific restrictions on them.
[0029] The welding strip 30 can be applied to the main grid or fine grid of the solar cell 20 to be welded.
[0030] It should be noted that -0.002 ≤ A ≤ -0.0019. For example, A is -0.001923.
[0031] 0.06 ≤ B ≤ 0.061. For example, B is 0.06033.
[0032] Based on this, the inventors of this utility model, after research and verification, discovered that under the conditions of -0.002≤A≤-0.0019 and 0.06≤B≤0.061, the stress on the edge of the battery cell 20 caused by the welding strip at the welding end can be significantly reduced.
[0033] Furthermore, the distance between the end weld strip and the edge designed in this invention can also reduce the electrical loss of the battery cell 20. Taking the battery cell 20 as a 210 battery cell as an example, with a fixed number of weld strips 30 on the battery cell 20, Table 1 shows an example of the correspondence between the distance between the end weld strip and the edge and the electrical loss provided by this invention.
[0034] Table 1: Correspondence between the distance between the end solder strip and the edge and electrical loss
[0035] Distance between end solder strip and edge (mm) Electrical losses 2 1.75％ 3 1.24％ 4 0.82％ 5 0.48％ 6 0.22％ 7 0.06％ 8 0 9 0.03％ 10 0.17％
[0036] As shown in Table 1, when the distance between the end solder strip and the edge is 8mm, the electrical loss of the cell 20 is 0. When the distance between the end solder strip and the edge is greater than 8mm or less than 8mm, the electrical loss of the cell 20 will increase.
[0037] Based on this, since the distance between the end solder strip and the edge is related to the length of the battery piece 20 in the second direction and the number of solder strips 30 on the battery piece 20, the distance between the end solder strip and the edge can be flexibly designed according to the size of the battery piece 20 and the number of solder strips 30 on the battery piece 20, thereby reducing the stress of the edge of the battery piece 20, reducing the risk of hidden cracking or breaking of the battery piece 20, and at the same time, the electrical loss of the battery piece can be reduced.
[0038] -2mm≤C≤2mm. For example, C is -2mm, -1mm, 0mm, 1mm, 2mm. Since errors will inevitably occur during the production of the battery piece 20, by setting the tolerance parameter C, the influence of the error on the stress of the edge can be reduced.
[0039] The utility model discloses in addition to the distance between the end solder strip and the edge is designed, the distance between the two adjacent solder strips 30 on the battery piece 20 is also designed.
[0040] In one design, the distance between the two adjacent solder strips 30 on the battery piece 20 is d2, d2=(W-E*d1) / (N-1), and E is a preset coefficient.
[0041] The distance between the two solder strips 30 refers to the distance between the center points of the width direction of the solder strip 30.
[0042] Based on this, since the distance between the two adjacent solder strips 30 on the battery piece 20 is related to the distance between the end solder strip and the edge, the size of the battery piece 20 and the number of solder strips 30 on the battery piece 20, the distance between the two adjacent solder strips 30 on the battery piece 20 can be flexibly designed according to the distance between the end solder strip and the edge, the size of the battery piece 20 and the number of solder strips 30 on the battery piece 20, thereby reducing the stress of the battery piece 20 between the adjacent solder strips 30, and further reducing the risk of hidden cracking or breaking of the battery piece 20.
[0043] It should be noted that 1≤E≤3. For example, E is 2. Based on this, the inventors of the utility model have found through research and verification that in the case of 1≤E≤3, the stress of the battery piece 20 between the adjacent solder strips 30 can be significantly reduced.
[0044] It can be understood that the photovoltaic module 10 can also include a metal frame, a back plate, a photovoltaic glass and a glue film. The glue film can be filled between the front and back surfaces of the battery piece 20, the photovoltaic glass and the adjacent battery piece 20, as a filler, which can be a transparent gel with good light transmission performance and aging resistance, for example, the glue film can use EVA glue film or POE glue film, which can be selected according to actual conditions, and is not limited here.
[0045] The photovoltaic glass can be covered on the adhesive film on the front surface of the cell piece 20, and the photovoltaic glass can be super white glass, which has high light transmittance, high transparency, and superior physical, mechanical and optical properties. For example, the light transmittance of the super white glass can be more than 92%, which can protect the cell piece 20 without affecting the efficiency of the cell piece 20 as much as possible. At the same time, the adhesive film can bond the photovoltaic glass and the cell piece 20 together, and the presence of the adhesive film can seal and insulate the cell piece 20 and prevent water and moisture.
[0046] The back plate can be attached to the adhesive film on the back surface of the cell piece 20, and the back plate can protect and support the cell piece 20, has reliable insulation, water resistance and aging resistance, and the back plate can have multiple choices, which can be tempered glass, organic glass, aluminum alloy TPT composite adhesive film, etc. The specific setting can be made according to the specific situation, which is not limited here. The whole composed of the back plate, the cell piece 20, the adhesive film and the photovoltaic glass can be arranged on the metal frame, and the metal frame serves as the main external support structure of the whole photovoltaic module 10, and can stably support and install the photovoltaic module 10. For example, the photovoltaic module 10 can be installed at the required installation position through the metal frame.
[0047] The utility model embodiment provides a kind of photovoltaic system, comprising above-mentioned battery module.
[0048] In the embodiment, the photovoltaic system can be applied in photovoltaic power station, such as ground power station, roof power station, water surface power station, etc., and can also be applied in equipment or device using solar energy to generate electricity, such as user solar power supply, solar street lamp, solar car, solar building, etc. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is to say, the photovoltaic system can be applied in all fields that need to use solar energy to generate electricity. Taking photovoltaic power generation system network as an example, the photovoltaic system can include photovoltaic array, current combiner and inverter, the photovoltaic array can be an array combination of multiple battery modules, for example, multiple battery modules can form multiple photovoltaic arrays, the photovoltaic array is connected to the current combiner, the current combiner can combine the current generated by the photovoltaic array, and the combined current flows through the inverter to convert into alternating current required by the power grid, and then accesses the power network to realize solar power supply.
[0049] Although the present application has been described in connection with various embodiments thereof with reference to the drawings, it will be apparent to those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application. Accordingly, it is intended that the present application not be limited by the above-described embodiments but be interpreted within the scope of the appended claims and their equivalents. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do not exclude a plurality. A single processor or other unit can fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
[0050] Although the present application has been described in connection with particular features thereof with reference to the drawings, it is to be understood that the application is not limited in scope to the described embodiments, and that changes can be made in form and detail without departing from the spirit and scope of the application. Accordingly, it is intended that the present application cover any and all modifications, variations, combinations or equivalents that fall within the scope of the present application as defined by the appended claims. It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.
Claims
1. A photovoltaic module, characterized by, The photovoltaic module comprises: a plurality of cells; a plurality of ribbons extending along a first direction and arranged along a second direction, connecting two adjacent cells, the first direction being perpendicular to the second direction; a ribbon adjacent to an edge of the cell is an end ribbon, the edge being parallel to the first direction, a distance between the end ribbon and the edge being d1, d1=W*(A*N+B)+C, W being a length of the cell in the second direction, N being a number of ribbons on the cell, A and B being preset coefficients, C being a tolerance parameter, -0.002≤A≤-0.0019, 0.06≤B≤0.061, -2mm≤C≤2mm.
2. The photovoltaic module of claim 1, wherein, A is -0.001923.
3. The photovoltaic module of claim 1, wherein, B is 0.06033.
4. The photovoltaic module according to any of claims 1 to 3, characterized in that A distance between two adjacent ribbons on the cell is d2, d2=(W-E*d1) / (N-1), E being a preset coefficient.
5. The photovoltaic module of claim 4, wherein, 1≤E≤3。 6. The photovoltaic module of claim 5, wherein, E is 2.
7. A photovoltaic system characterized by, The photovoltaic module comprises any one of claims 1-6.