Photovoltaic module and photovoltaic system
By designing the cell arrangement and mirror-image half-cell structure in the photovoltaic module, the distance problem when welding the welding ribbon and the busbar is solved, the welding effect and the aesthetics of the module are improved, and efficient welding and beautiful photovoltaic module design are achieved.
Patent Information
- Application Number
- CN202422904699.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-11-27
AI Technical Summary
When using multi-busbar back-contact solar cells to prepare photovoltaic modules, the welding point between the welding ribbons extending from the ends of the cell strings and the middle busbars can easily affect the welding effect and the aesthetics of the modules are poor.
By designing the battery cell arrangement, the soldering ribbon is led out from the second-to-last battery cell edge, and a mirrored half-cell structure is used to ensure that the distance between the soldering ribbon and the bus bar when welding is far away from the bend and on the same straight line, and an intermediate bus bar is used to connect multiple battery strings.
It improves the welding effect and the aesthetics of photovoltaic modules, ensuring the weldability and the overall layout of the modules are beautiful.
Smart Images
Figure CN223415199U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of solar cells, and in particular to a photovoltaic module and a photovoltaic system. Background Art
[0002] Solar cells, also known as photovoltaic cells, are devices that use the photovoltaic effect to directly convert sunlight into direct current. The PN junction on the semiconductor in a solar cell converts sunlight directly into electricity through the photovoltaic effect. The most common are crystalline silicon solar cells, including monocrystalline and polycrystalline silicon solar cells. Solar cells are typically sheet-shaped. A solar cell with both polarity electrodes formed on the back of the cell is called a back-contact cell.
[0003] Currently, amidst the growing development and competition among various high-efficiency battery module technologies in the photovoltaic industry, back-contact battery-based photovoltaic modules are highly sought after by the market due to their unobstructed front-side busbars, increased light-receiving area, high battery efficiency, and high module conversion efficiency. With the increasing demand for higher efficiency, there is a need to increase the number of busbars in back-contact battery cells to improve current collection capacity. However, when manufacturing photovoltaic modules using multi-busbar back-contact battery cells, the soldering ribbons extending from the ends of the battery string (such as the terminal) are close to the bend of the central busbar, which can easily affect the welding effect and even the aesthetics of the photovoltaic module.
[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. Summary of the Invention
[0005] The embodiments of the present application provide a photovoltaic module and a photovoltaic system to solve or alleviate the above-mentioned problem that when a photovoltaic module is prepared using multi-main-grid back-contact solar cells, the intermediate bus bar is bent at the punching point when the welding ribbon led out from the end of the battery string and the intermediate bus bar are welded, which can easily affect the welding effect and the aesthetics of the photovoltaic module.
[0006] In one aspect of an embodiment of the present application, a photovoltaic module is provided. The module includes: a first battery string and a second battery string connected by an intermediate bus bar, the first battery string including a first battery cell, the second battery string including a second battery cell, a third battery string and a fourth battery string connected by the intermediate bus bar, the third battery string including a second battery cell, and the fourth battery string including a first battery cell, wherein, in the direction in which the intermediate bus bar extends, the first battery string and the third battery string are arranged side by side, and the second battery string and the fourth battery string are arranged side by side, the first battery cell and the second battery cell located on both sides of the bus bar have the same electrode polarity on the same straight line, and the first battery cell and the second battery cell are mirror-image half-cell cells.
[0007] In the photovoltaic module of the present application, the welding ribbon drawn out near the punching position is far away from the punching position, and is also far away from the bend of the bus bar, which is conducive to improving the weldability of the middle bus bar and the welding ribbon when welding, thereby improving the welding effect. In addition, the photovoltaic module of the present application has a beautiful appearance. Specifically, the present application extends the distance between the welding ribbon drawn out from the edge of the battery cell and the bent lead line by all the welding ribbons from at least the second to last one at the edge of the battery cell, which is conducive to welding by the welding head of the stitch welding machine, and the first battery cell and the second battery cell are mirror-image half-batteries, thereby ensuring that all the lead-out welding ribbons are in the same straight line, which is conducive to welding. In addition, the welding ribbons drawn out of the present application (that is, the welding ribbons welded to the bus bar) are on the same straight line on both sides, so that they are more beautiful after welding, thereby making the overall layout of the photovoltaic module look more beautiful.
[0008] According to an embodiment of the present application, the first battery string further includes a third battery cell, the third battery cell and the first battery cell are arranged alternately at intervals in sequence, and the second battery cell is rotated 180° to obtain the third battery cell; the second battery string further includes a fourth battery cell, the fourth battery cell and the second battery cell are arranged alternately at intervals in sequence, and the first battery cell is rotated 180° to obtain the fourth battery cell; the third battery string further includes a fourth battery cell, the fourth battery cell and the second battery cell are arranged alternately at intervals in sequence, and the first battery cell is rotated 180° to obtain the fourth battery cell; the fourth battery string further includes a third battery cell, the third battery cell and the first battery cell are arranged alternately at intervals in sequence, and the second battery cell is rotated 180° to obtain the third battery cell, wherein the electrodes of two adjacent battery cells on the same straight line in each battery string have opposite polarities.
[0009] According to an embodiment of the present application, in the direction in which the middle bus bar extends, the first battery string and the third battery string are arranged at intervals; and the second battery string and the fourth battery string are arranged at intervals.
[0010] According to an embodiment of the present application, the first battery string and the third battery string are connected via a first bus bar; and the second battery string and the fourth battery string are connected via a second bus bar.
[0011] According to an embodiment of the present application, the first cell and the second cell are half-cells obtained by cutting a back-contact solar cell.
[0012] According to an embodiment of the present application, along the series connection direction of the first battery string, there is a distance between two adjacent half-cells in each battery string.
[0013] According to an embodiment of the present application, along the series connection direction of the first battery string, the first half of the battery cells in each battery string are overlapped with the second half of the battery cells.
[0014] According to an embodiment of the present application, along the series connection direction of the first battery string, the overlap length is 0.06-0.3 mm.
[0015] According to an embodiment of the present application, it further includes: a glass plate located on the front side of the photovoltaic module and a back plate located on the back side of the photovoltaic module.
[0016] Another aspect of the present invention provides a photovoltaic system comprising the photovoltaic module of any of the above embodiments. The photovoltaic system also has the advantages of the above photovoltaic modules, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] 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.
[0018] Figure 1 is a schematic structural diagram of a first battery cell and a second battery cell in some embodiments;
[0019] Figure 2 is a schematic structural diagram of a photovoltaic module in some embodiments;
[0020] Figure 3 is a schematic structural diagram of photovoltaic modules in other embodiments;
[0021] Figure 4 is a front view of the structure of a first battery string in some embodiments;
[0022] Figure 5 is a rear view of the structure of a first battery string in some embodiments;
[0023] Figure 6 is a front view of the structure of a second battery string in some embodiments;
[0024] Figure 7 FIG. 4 is a rear view of the structure of a second battery string in some embodiments.
[0025] Description of reference numerals:
[0026] 1: First electrode; 11: Back contact solar cell; 2: Second electrode; 22: First cell string; 3: Third electrode; 33: Second cell string; 4: Fourth electrode; 5: Photovoltaic module; 6: Perforation. DETAILED DESCRIPTION
[0027] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. In the accompanying drawings, the sizes of layers, regions, and elements and their relative sizes may be exaggerated for clarity. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other unless there is a conflict.
[0028] It should be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" another element or layer, it can be directly on, adjacent to, connected to, or coupled to the other element or layer, or there can be intervening elements or layers. Conversely, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" another element or layer, there can be no intervening elements or layers. It should be understood that while the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are merely used to distinguish one element, component, region, layer, or portion from another. Thus, without departing from the teachings of the present application, a first element, component, region, layer, or portion discussed below may be referred to as a second element, component, region, layer, or portion. Furthermore, when a second element, component, region, layer, or portion is discussed, it does not necessarily indicate that the first element, component, region, layer, or portion is present in the present application.
[0029] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.
[0030] 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.
[0031] In the present application, when it comes to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values in the numerical interval is considered to be continuous, and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical interval, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to an integer in the numerical interval, including the two endpoint integers of the numerical range, and each integer between the two endpoints, is equivalent to directly enumerating each integer. When multiple numerical ranges are provided to describe a feature or characteristic, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical range disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. "Numerical interval" allows broadly including quantitative intervals such as percentage intervals, ratio intervals, and ratio intervals.
[0032] During the photovoltaic module manufacturing process, busbars and ribbons are welded together inside a stitch welder. This machine uses an automated soldering head, similar to a soldering iron, with a certain width. Typically, the lead-out ribbon extends from the busbar at the very edge of the cell. This ribbon is relatively close (approximately 1-2 mm) to the bent lead-out line of the busbar, affecting the weld quality of the stitch welder's welding head, which presses down on the busbar and the edge lead-out ribbon.
[0033] In one aspect of an embodiment of the present application, a photovoltaic module is provided. The module includes: a first battery string and a second battery string connected by an intermediate bus bar, the first battery string including a first battery cell, the second battery string including a second battery cell, and a third battery string and a fourth battery string connected by the intermediate bus bar, the third battery string including a second battery cell, and the fourth battery string including a first battery cell, wherein, in the direction in which the intermediate bus bar extends, the first battery string and the third battery string are arranged side by side, and the second battery string and the fourth battery string are arranged side by side, the first battery cell and the second battery cell located on opposite sides of the bus bar have the same electrode polarity on the same straight line, and the first battery cell and the second battery cell are mirror-image half-cell cells.
[0034] In the photovoltaic module of the present application, the welding ribbon drawn out near the punching position is far away from the punching position, and is also far away from the bend of the bus bar, which is conducive to improving the weldability of the middle bus bar and the welding ribbon when welding, thereby improving the welding effect. In addition, the photovoltaic module of the present application has a beautiful appearance. Specifically, the present application extends the distance between the welding ribbon drawn out from the edge of the battery cell and the bent lead line by all the welding ribbons from at least the second to last one at the edge of the battery cell, which is conducive to welding by the welding head of the stitch welding machine, and the first battery cell and the second battery cell are mirror-image half-batteries, thereby ensuring that all the lead-out welding ribbons are in the same straight line, which is conducive to welding. In addition, the welding ribbons drawn out of the present application (that is, the welding ribbons welded to the bus bar) are on the same straight line on both sides, so that they are more beautiful after welding, thereby making the overall layout of the photovoltaic module look more beautiful.
[0035] In some embodiments, reference Figure 1 The first and second cells are half-cells cut from a back-contact solar cell 11 with an even number of busbars. The first cell can be cell B, and the second cell can be cell A. Cell A and cell B are mirror-image cells. The first electrode 1 on cell A and the third electrode 3 on cell B are aligned, indicating the same polarity. The second electrode 2 on cell A and the fourth electrode 4 on cell B are aligned, indicating the same polarity.
[0036] In some embodiments, reference Figure 2 In the first horizontal row of a photovoltaic module, the first and second cells are connected to the center busbar via a soldering ribbon. In the second horizontal row, the second and first cells are connected to the center busbar via a soldering ribbon. This ensures that the soldering ribbons connecting the busbars to the back glass holes are located away from the holes (the second electrode 2 on cell A and the fourth electrode 4 on cell B are located away from the holes 6), that is, away from the bend of the busbar. The soldering ribbons that need to be led out of the holes for welding to the busbars are the second-to-last ribbons, and they are all aligned in the same row. This reduces solder joints, ensures the module's aesthetics, and does not affect the welding of the lead-out ribbons to the busbars, making the equipment easy to operate.
[0037] In some embodiments, the first battery string further includes a third battery cell, the third battery cell and the first battery cell are arranged alternately at intervals in sequence, and the second battery cell is rotated 180° to obtain the third battery cell; the second battery string further includes a fourth battery cell, the fourth battery cell and the second battery cell are arranged alternately at intervals in sequence, and the first battery cell is rotated 180° to obtain the fourth battery cell; the third battery string further includes a fourth battery cell, the fourth battery cell and the second battery cell are arranged alternately at intervals in sequence, and the first battery cell is rotated 180° to obtain the fourth battery cell; the fourth battery string further includes a third battery cell, the third battery cell and the first battery cell are arranged alternately at intervals in sequence, and the second battery cell is rotated 180° to obtain the third battery cell, wherein the electrodes of two adjacent battery cells on the same straight line in each battery string have opposite polarities.
[0038] For some examples, see Figure 3 The photovoltaic assembly 5 includes a first cell string, a second cell string, a third cell string, and a fourth cell string. The first cell string and the second cell string are connected in parallel via an intermediate bus bar. That is, the first cell string is connected to the intermediate bus bar via the third electrode 3, and the second cell string is connected to the intermediate bus bar via the first electrode 1. The first cell string and the second cell string are connected in parallel. The third cell string and the fourth cell string are connected in parallel via the intermediate bus bar. That is, the third cell string is connected to the intermediate bus bar via the second electrode 2, and the fourth cell string is connected to the intermediate bus bar via the fourth electrode 4. The third cell string and the fourth cell string are connected in parallel. In addition, the first cell string and the third cell string are connected in series, and the second cell string and the fourth cell string are connected in series. In each cell string, the electrodes of two adjacent cells connected to the intermediate bus bar on the same straight line have the same polarity. For example, the electrodes of two adjacent cells in the first cell string on the same straight line have opposite polarity.
[0039] In some embodiments, the number of photovoltaic module cell strings is not particularly limited and can be designed according to actual requirements.
[0040] Optionally, in the direction in which the middle bus bar extends, the first battery string and the third battery string are arranged alternately at intervals; and the second battery string and the fourth battery string are arranged alternately at intervals.
[0041] Furthermore, the number of alternating intervals is 2.
[0042] In some embodiments, the first battery string and the third battery string are connected via a first bus bar, and the second battery string and the fourth battery string are connected via a second bus bar. The first bus bar is used to connect the first battery string and the third battery string in series, and the second bus bar is used to connect the second battery string and the fourth battery string in series.
[0043] In some embodiments, reference Figure 4 and 5 The first battery string 22 includes a third battery cell (a battery cell obtained by rotating battery cell A by 180°) and a first battery cell (battery cell B) arranged at intervals. One end of the second battery string is led out from the second electrode 2 and the other end is led out from the third electrode 3.
[0044] Optionally, the third battery string is a battery string formed by rotating the first battery string by 180°.
[0045] In some embodiments, reference Figure 6 and 7 The second battery string 33 includes a fourth battery cell (a battery cell obtained by rotating battery cell B by 180°) and a second battery cell (battery cell A) arranged at intervals. One end of the second battery string is led out from the second electrode 2 , and the other end is led out from the third electrode 3 .
[0046] Optionally, the fourth battery string is a battery string formed by rotating the second battery string by 180°.
[0047] In some embodiments, the first cell and the second cell are half-cells obtained by cutting a back-contact solar cell.
[0048] In some embodiments, along the series connection direction of the first battery string, there is a gap between two adjacent half-cells in each battery string.
[0049] In some embodiments, the spacing is less than or equal to 10 mm.
[0050] In other embodiments, along the series connection direction of the first battery string, the first half of the battery cell overlaps and partially overlaps the second half of the battery cell. Optionally, along the series connection direction of the first battery string, the tail of the first half of the back-contact battery cell overlaps the head of the second half of the back-contact battery cell. The back-contact battery halves are connected in series on the back side via a single solder ribbon, which can reduce the overall module area.
[0051] In some embodiments, along the series connection direction of the first battery string, the overlap length is 0.06-0.3 mm, which can reduce the overall area of the component and increase the illuminated area.
[0052] In some embodiments, the photovoltaic module further comprises a backsheet, a cell string, and a glass sheet, wherein the backsheet and the cell string are connected by an adhesive film, and the glass sheet and the cell string are also connected by an adhesive film. The cell string comprises the aforementioned first cell string, second cell string, third cell string, and fourth cell string.
[0053] Another aspect of the present invention provides a photovoltaic system comprising the photovoltaic module of any of the above embodiments. The photovoltaic system also has the advantages of the above photovoltaic modules, which will not be described in detail here.
[0054] In some embodiments, the above-mentioned photovoltaic system has a wide range of applications and is not limited to photovoltaic power stations, such as ground power stations, rooftop power stations, and water-surface power stations, but also includes various equipment and devices that use solar energy to generate electricity, such as user solar power supplies, solar street lights, solar cars, and solar buildings. Of course, it is understandable that the application scenarios of the photovoltaic system are not limited to this, that is, the photovoltaic system can be used in all fields that require solar energy to generate electricity. Taking the photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a junction box, and an inverter. The photovoltaic array may be an array combination of multiple photovoltaic modules. For example, multiple photovoltaic modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the junction box, which can converge the current generated by the photovoltaic array. The converged current flows through the inverter to be converted into the alternating current required by the mains power grid and then connected to the mains power network to achieve solar power supply.
[0055] It should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are only for the convenience of describing the present application and simplifying the description, and are not intended to 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 should not be understood as limiting the present application. The directional terms "inside" and "outside" refer to the inside and outside relative to the outline of the component itself. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "on top of other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Therefore, the exemplary term "above..." can include both "above..." and "below..." orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here will be interpreted accordingly.
[0056] It should also be noted that references to "some embodiments," "other embodiments," "embodiments," etc., in this application refer to specific features, structures, or characteristics described in conjunction with such embodiments as are included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the 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 the realization of such feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this application.
[0057] 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.
[0058] 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 photovoltaic module, characterized in that: include: A first battery string and a second battery string connected by an intermediate bus bar, wherein the first battery string includes a first battery cell and the second battery string includes a second battery cell. A third battery string and a fourth battery string connected via the intermediate bus bar, wherein the third battery string includes the second battery cell and the fourth battery string includes the first battery cell. In which, in the direction in which the middle bus bar extends, the first battery string and the third battery string are arranged side by side, and the second battery string and the fourth battery string are arranged side by side. The first battery cells and the second battery cells located on both sides of the middle bus bar have the same electrode polarity on the same straight line, and the first battery cells and the second battery cells are mirror-image half-cells.
2. The photovoltaic module according to claim 1, characterized in that The first battery string further includes a third battery cell, wherein the third battery cell and the first battery cell are alternately arranged in sequence, and the second battery cell is rotated 180 degrees to obtain the third battery cell; The second battery string further includes a fourth battery cell, wherein the fourth battery cell and the second battery cell are alternately arranged in sequence, and the fourth battery cell is obtained by rotating the first battery cell by 180°; The third battery string further includes a fourth battery cell, wherein the fourth battery cell and the second battery cell are alternately arranged in sequence, and the fourth battery cell is obtained by rotating the first battery cell by 180°; The fourth battery string further includes a third battery cell, wherein the third battery cell and the first battery cell are alternately arranged in sequence, and the second battery cell is rotated 180 degrees to obtain the third battery cell. The electrode polarities of two adjacent battery cells in each battery string that are on the same straight line are opposite.
3. The photovoltaic module according to claim 2, characterized in that In the direction in which the middle bus bar extends, the first battery string and the third battery string are arranged alternately; The second battery string and the fourth battery string are arranged alternately.
4. The photovoltaic module according to claim 2 or 3, characterized in that: The first battery string and the third battery string are connected via a first bus bar; The second battery string and the fourth battery string are connected via a second bus bar.
5. The photovoltaic module according to claim 4, characterized in that: The first cell and the second cell are half-cells obtained by cutting a back-contact solar cell.
6. The photovoltaic module according to claim 4, characterized in that: Along the series connection direction of the first battery string, there is a distance between two adjacent half-cell sheets in each battery string.
7. The photovoltaic module according to claim 4, characterized in that: Along the series connection direction of the first battery string, the first half of the battery cells in each battery string overlap with the second half of the battery cells.
8. The photovoltaic module according to claim 7, characterized in that: Along the series connection direction of the first battery string, the overlap length is 0.06-0.3 mm.
9. The photovoltaic module according to any one of claims 5 to 8, characterized in that: Also includes: The glass sheet located on the front of the photovoltaic module and the back sheet located on the back of the photovoltaic module.
10. A photovoltaic system, characterized in that: The photovoltaic system comprises the photovoltaic assembly according to any one of claims 1 to 9.