Novel quarter slice photovoltaic module
Through the combination of all-quarter cell cell structure and cell string, the load capacity and light shielding losses caused by the increase in cell size in photovoltaic modules are solved, and efficient power output and cost reduction of photovoltaic modules are achieved.
Patent Information
- Application Number
- CN202422037540.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-21
AI Technical Summary
As the power of photovoltaic modules increases, the cell size increases, resulting in a decrease in the load capacity of the module and an increase in the light shielding loss. There is a risk of out-of-frame design and a large current.
The cell structure of all quarter pieces is adopted, with the ratio of adjacent short sides to long sides of the cell being 1:4. The cell string unit is symmetrically distributed along the long sides of the component, connected in parallel, center and branch bus bars are set, and diodes are bypassed to reduce light shielding loss and heat spot effect.
Effectively reduce light shielding losses, improve the power output capacity of photovoltaic modules, reduce single-watt costs, avoid component loads from frame, and improve the photoelectric conversion efficiency of the battery cell.
Smart Images
Figure CN223142402U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic power generation, in particular to a novel quarter-cut photovoltaic module. Background Technique
[0002] With the rapid growth of the market demand for photovoltaic modules, the power of photovoltaic modules is getting higher and higher. In order to improve the output power of photovoltaic modules, the size of the modules is gradually increasing. For example, wafers with sizes of 166mm, 180mm, and 210mm are used more and more frequently. When the size of the wafer reaches 210mm, the width of the front glass required by the conventional circuit design will exceed 1300mm, and the load capacity of the module also decreases, increasing the risk of the module load falling out of the frame. At the same time, the area of the 210mm-sized wafer increases by 80% relatively. Even if the wafer is cut in half, the current of the module is still relatively large.
[0003] Therefore, we propose a novel quarter-cut photovoltaic module to solve the above problems. Content of the Utility Model
[0004] The purpose of the utility model is to provide a novel quarter-cut photovoltaic module to solve the problems raised in the above background technique.
[0005] To achieve the above purpose, the utility model provides the following technical solutions:
[0006] A novel quarter-cut photovoltaic module includes a glass layer, a battery layer, a backplane layer, an EVA layer, a junction box, and a frame. The battery layer includes two battery string group units connected in parallel. Each battery string group unit includes two battery string sub-units connected in parallel. Each battery string sub-unit includes three battery strings connected in series. Each battery string includes two battery strings connected in series. Each battery string includes N battery wafers connected in series. The battery wafers are quarter wafers cut from a whole wafer, and the ratio of the adjacent short side to the long side of the battery wafer is 1:4.
[0007] In a further embodiment, the battery string group units are symmetrically distributed along the long side direction of the module.
[0008] In a further embodiment, the battery strings are arranged parallel to the long side direction of the module.
[0009] In a further embodiment, the photovoltaic module further includes a center busbar extending along the short side direction of the module. Two battery string sub-units in each battery string group unit are symmetrically connected in parallel to the center busbar.
[0010] In a further embodiment, a pair of battery strings in each battery string group unit are reversely connected in parallel with a bypass diode through the center busbar.
[0011] In a further embodiment, the photovoltaic module further includes branch busbars extending along the long side direction of the module. There are two branch busbars, and the two branch busbars are respectively connected in parallel between the two central busbars.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0013] By adopting quarter cells in the present utility model, the side length of the cells is reduced, so that the arranged cell layer effectively reduces the loss of light shielding compared with the cell array of the existing half-cell module, which is beneficial to improving the power output capacity of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the structural split of the present utility model;
[0015] Figure 2 It is a schematic diagram of the cell arrangement of the photovoltaic module of the present utility model;
[0016] Figure 3 It is an equivalent circuit diagram of the photovoltaic module of the present utility model.
[0017] In the figure: 1. Battery string unit; 11. Battery string sub-unit; 12. Battery string group; 13. Battery string; 14. Cell; 2. Central busbar; 3. Bypass diode; 4. Branch busbar. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.
[0019] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0021] Please refer to Figures 1-3 , a new type of quarter-sliced photovoltaic module, including a glass layer, a battery layer, a backsheet layer, an EVA layer, a junction box and a frame. Among them, the EVA layer is located between the glass layer and the battery layer and between the battery layer and the backsheet layer, so that the entire module is laminated and formed by sequentially laminating the glass layer, the EVA layer, the battery layer, the EVA layer, and the backsheet layer. The frame is used to frame the entire module, and the junction box is installed on the back of the backsheet layer. The battery layer includes two battery string group units 1 connected in parallel. Each battery string group unit 1 includes two battery string sub-units 11 connected in parallel. Each battery string sub-unit 11 includes three battery strings 12 connected in series. Each battery string 12 includes two battery strings 13 connected in series. Each battery string 13 includes N battery cells 14 connected in series. The battery cells 14 are quarter-slices cut from a whole battery, and the ratio of the adjacent short side to the long side of the battery cell 14 is 1:4. Specifically, when using a 210*210mm battery, three parallel equal division lines are scribed by laser, and the 210*210mm battery is divided into four 210*52.5mm quarter-slices. By adopting the quarter-slice structure compared with the whole battery, its side length is effectively shortened. Dividing the entire module into two symmetric battery string group units 1 can make the light angles received by the two battery string group units 1 different, thereby reducing the light shielding loss, which is beneficial to improving the photoelectric conversion efficiency of the battery cells 14. At the same time, due to the quarter battery cells 14, the single-piece current is reduced, which can reduce the internal loss, thereby increasing the output power of the photovoltaic module and helping to reduce the cost per watt.
[0022] The battery string group units 1 are symmetrically distributed along the long side direction of the module, and the battery strings 13 are arranged parallel to the long side direction of the module. The photovoltaic module adopts the above circuit layout method, making the circuit connection method relatively simple, and the change in the width of the module is small, which can meet the connection and layout requirements of large-size batteries using conventional-width glass, and avoid the problem of the module load falling off the frame.
[0023] The photovoltaic module further includes a central bus bar 2 extending along the short side direction of the module. Two sub-units 11 of battery string groups are symmetrically connected in parallel to the central bus bar 2 to form a battery string group unit 1. A pair of bypass diodes 3 are reversely connected in parallel to each other through the central bus bar 2 for each pair of battery string groups 12 in each battery string group unit 1. The pair of battery string groups 12 are located on both sides of the central bus bar 2, so that each battery string group unit 1 is provided with three bypass diodes 3. By providing the bypass diodes 3, the hot spot effect of the module can be reduced and the performance of the photovoltaic module can be improved.
[0024] To facilitate the circuit connection between the two sub-units 11 of battery string groups, the photovoltaic module is further provided with branch bus bars 4 extending along the long side direction of the module. There are two branch bus bars 4, and the two branch bus bars 4 are respectively connected in parallel between the two central bus bars 2, so as to form a plurality of output terminals, namely A, B, C, and D. As Figure 3 shown, according to the usage requirements, parallel output of A-B or D-C can be selected, or diagonal output of A-C or D-B can be selected. Specifically, in one of the embodiments, diagonal output is set, and its junction box on the backplane layer is arranged as Figure 1 shown. In addition, the branch bus bar 4 is not on the same plane as the battery layer, and is embedded in the EVA layer, so that it can overlap with the position of the battery cell 14, but does not affect the normal circuit conduction of the battery cell 14, thereby avoiding occupying the side space of the module.
[0025] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.
[0026] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A novel quarter - cut photovoltaic module, comprising a glass layer, a cell layer, a backplane layer, an EVA layer, a junction box and a frame, characterized in that, The battery layer includes two battery string group units (1) connected in parallel. Each battery string group unit (1) includes two battery string sub-units (11) connected in parallel. Each battery string sub-unit (11) includes three battery strings (12) connected in series. Each battery string (12) includes two battery strings (13) connected in series. Each battery string (13) includes N battery cells (14) connected in series. The battery cells (14) are quarter cells cut from a whole cell, and the ratio of the adjacent short side to the long side of the battery cell (14) is 1:
4.
2. The novel quarter-sliced photovoltaic module according to claim 1, wherein: The battery string group units (1) are symmetrically distributed along the long side direction of the component.
3. A novel quarter - sliced photovoltaic module according to claim 1, wherein: The battery strings (13) are arranged parallel to the long side direction of the component.
4. A novel quarter-sliced photovoltaic module according to claim 1, characterized in that: The photovoltaic module further includes a central bus bar (2) extending along the short side direction of the component. Two battery string sub-units (11) in each battery string group unit (1) are symmetrically connected in parallel to the central bus bar (2).
5. A novel quarter-sliced photovoltaic module according to claim 4, wherein: A bypass diode (3) is reversely connected in parallel to a pair of battery strings (12) in each battery string group unit (1) through the central bus bar (2).
6. A novel quarter - sliced photovoltaic module according to claim 4, wherein: The photovoltaic module further includes branch bus bars (4) extending along the long side direction of the component. There are two branch bus bars (4), and the two branch bus bars (4) are respectively connected in parallel between the two central bus bars (2).