A photovoltaic module

Abstract

The application relates to a photovoltaic module, the width W of the photovoltaic module satisfies 2234mm<=W<=2254mm; the photovoltaic module comprises at least eight cell strings arranged along the width direction of the photovoltaic module, and the cell string comprises cell pieces, and the length l of the cell piece satisfies 265mm<=l<=285mm. By increasing the length of the cell piece, the area of the cell piece is increased, that is, the area of the photoelectric conversion region on the photovoltaic module is increased, and the output power of the photovoltaic module is improved; by limiting the width size of the photovoltaic module, sufficient arrangement space is provided for the cell string, so that the stability and reliability of the cell piece arranged in the cell layer are improved, and the photovoltaic module can realize stable output. On the other hand, the size of the photovoltaic module is better adapted to the size of the container used for transporting the photovoltaic module, so that the container can store more number of photovoltaic modules, the possibility of waste of the internal space of the container is reduced, and the transportation cost of the photovoltaic module is reduced.

Description

Technical Field

[0001] This application relates to the field of solar cell technology, and more specifically to a photovoltaic module. Background Technology

[0002] Photovoltaic modules are used to convert received solar energy into electrical energy. Currently, the utilization rate of the internal space of photovoltaic modules during transportation is low, which affects the loading and transportation process of photovoltaic modules. Summary of the Invention

[0003] In view of this, this application provides a photovoltaic module to solve the technical problems existing in the prior art and improve the output power of the photovoltaic module.

[0004] This application provides a photovoltaic module with a width W satisfying: 2234mm≤W≤2254mm; the photovoltaic module includes at least eight battery strings arranged along the width direction of the photovoltaic module, each battery string including a battery cell, and the length l of the battery cell satisfying: 265mm≤l≤285mm.

[0005] In one possible implementation, along the width direction of the photovoltaic module, the spacing D1 between adjacent cell strings satisfies: 1.2mm ≤ D1 ≤ 2mm.

[0006] In one possible implementation, the length L of the photovoltaic module satisfies: 2374mm≤L≤2394mm; each of the battery strings has N battery cells arranged along the length direction of the photovoltaic module, where N satisfies: 16≤N≤48.

[0007] In one possible implementation, the width w of the battery cell satisfies: 47.7mm ≤ w ≤ 142.7mm.

[0008] In one possible implementation, along the length of the photovoltaic module, the spacing D2 between adjacent cells in any of the cell strings satisfies: 0.6mm ≤ D2 ≤ 1mm.

[0009] In one possible implementation, along the width direction of the photovoltaic module, the creepage distance P1 from the edge of the solar cell to the edge of the cover plate of the photovoltaic module satisfies: 13.8mm≤P1≤14.8mm, and / or; along the length direction of the photovoltaic module, the creepage distance P2 from the edge of the solar cell to the edge of the cover plate of the photovoltaic module satisfies: 20.3mm≤P2≤22.3mm.

[0010] In one possible implementation, the solar cell has M main bus lines, where M satisfies: 2² ≤ M ≤ 3³.

[0011] In one possible implementation, the spacing D3 between adjacent main grid lines satisfies: 8.6mm ≤ D3 ≤ 12.9mm.

[0012] In one possible implementation, the photovoltaic module includes a busbar, through which the battery strings are electrically connected; the width d of the busbar satisfies: 3.5mm≤d≤22.5mm, and / or; the thickness h of the busbar satisfies: 0.275mm≤h≤0.575mm.

[0013] In one possible implementation, the length of the photovoltaic module is L; the sum of the dimensions of the cells in each battery string along the length direction of the photovoltaic module is A; A and L satisfy: 0.95≤A / L≤0.98.

[0014] This application provides a photovoltaic module with a width W satisfying: 2234mm ≤ W ≤ 2254mm. The photovoltaic module includes at least eight cell strings arranged along its width direction. Each cell string includes a solar cell, and the length l of the solar cell satisfies: 265mm ≤ l ≤ 285mm. This application increases the area of ​​the solar cells by increasing their length, thereby increasing the area of ​​the photovoltaic module's photoelectric conversion region. This allows the photovoltaic module to fully utilize the received sunlight, thus improving its output power and performance. By limiting the overall width of the photovoltaic module, sufficient space is provided for the cell strings, which helps improve the stability and reliability of the solar cell arrangement, enabling the photovoltaic module to achieve stable output. Furthermore, the above design allows the size of the photovoltaic module to better match the size of the shipping container used for transporting the photovoltaic module. This means the photovoltaic modules can be rationally arranged inside the container, allowing the container to store a larger number of photovoltaic modules, reducing the possibility of wasted space inside the container, and thus lowering the transportation cost of the photovoltaic modules.

[0015] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a photovoltaic module in one embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the arrangement of solar cells in a photovoltaic module according to one embodiment of this application;

[0019] Figure 3 This is a schematic diagram illustrating the arrangement of photovoltaic modules within a container in related technologies.

[0020] Figure 4 This is a schematic diagram of photovoltaic modules being arranged inside a container in one embodiment of this application;

[0021] Figure 5 This is a schematic diagram of a battery cell in one embodiment of this application;

[0022] Figure 6 This is a partial schematic diagram of the connection between the busbar and the battery string in one embodiment of this application. Detailed Implementation

[0023] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0025] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0026] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0027] like Figure 1As shown in the illustration, this application provides a photovoltaic module 1. The photovoltaic module 1 may include a cover plate 12, a first encapsulating film layer 13, a cell layer 14, a second encapsulating film layer 15, and a backsheet 16. The cover plate 12, the first encapsulating film layer 13, the cell layer 14, the second encapsulating film layer 15, and the backsheet 16 are arranged along the thickness direction Z of the photovoltaic module 1 and laminated together. The cover plate 12 may be a glass cover plate with high light transmittance. The first encapsulating film layer 13 bonds the cover plate 12 to the cell layer 14, providing encapsulation and protection for the cell layer 14. The material of the first encapsulating film layer 13 may be one or more of ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), and polyvinyl butyral (PVB). The cell layer 14 includes multiple solar cells 111, which can convert solar energy into electrical energy. The second adhesive film layer 15 connects the battery layer 14 to the backsheet 16, and also serves to encapsulate and protect the battery layer 14. The material of the second adhesive film layer 15 can be one or more of the aforementioned EVA, POE, and PVB. The material of the backsheet 16 can be glass, or the backsheet 16 can also be composed of multiple polymer film layers.

[0028] Combination Figure 1 and Figure 2 As shown, the battery layer 14 includes at least eight battery strings 11 arranged along the width direction Y of the photovoltaic module 1. Each battery string 11 has multiple interconnected battery cells 111. The length l of the battery cells 111 satisfies: 265mm ≤ l ≤ 285mm. For example, l can be 265mm, 266mm, 268mm, 270mm, 271mm, 272mm, 273mm, 274mm, 275mm, 276mm, 277mm, 278mm, 279mm, 280mm, 281mm, 282mm, 283mm, 284mm, or 285mm. Of course, it can also be other values ​​within the above range. In related technologies, the length of solar cells is typically around 160mm to 220mm. Compared to related technologies, this application embodiment increases the length of the solar cell 111 to increase its area, that is, to increase the area of ​​the photovoltaic module 1 where photoelectric conversion occurs. This allows the photovoltaic module 1 to fully utilize the received sunlight, thereby increasing the output power of the photovoltaic module 1 and improving its performance.

[0029] The width direction of the aforementioned solar cell 111 is the same as the length direction X of the photovoltaic module 1. The width W of the photovoltaic module 1 satisfies: 2234mm ≤ W ≤ 2254mm. For example, W can be 2234mm, 2236mm, 2238mm, 2240mm, 2241mm, 2242mm, 2243mm, 2244mm, 2245mm, 2246mm, 2247mm, 2248mm, 2249mm, 2250mm, 2252mm, or 2254mm, or other values ​​within the above range. By limiting the overall width of the photovoltaic module 1, sufficient space is provided for the arrangement of the cell string 11, which helps to improve the stability and reliability of the solar cell 111 arrangement in the cell layer 14, enabling the photovoltaic module 1 to achieve stable output. On the other hand, by designing the width of the photovoltaic module 1 as described above, the size of the photovoltaic module 1 is better matched with the size of the container used to transport the photovoltaic module 1. In other words, the photovoltaic module 1 can be reasonably arranged inside the container, so that the container can store more photovoltaic modules 1, reduce the possibility of wasting space inside the container, and thus reduce the transportation cost of the photovoltaic module 1.

[0030] This application provides a high-output power photovoltaic module 1. By increasing the width of the solar cells 111, the area of ​​the solar cells 111 is increased, thereby improving the output power of the photovoltaic module 1 to 1200W. At the same time, by designing the length of the photovoltaic module 1, the solar cells 111 are arranged reasonably inside the photovoltaic module 1, improving the overall reliability of the photovoltaic module 1. On the other hand, the photovoltaic module 1 provided by this application also has transportation advantages, that is, it improves the utilization rate of container space, thereby reducing the transportation cost of the photovoltaic module 1.

[0031] The types of the aforementioned solar cells 111 include, but are not limited to, passivated emitter rear cell (PERC), tubeless oxide passivated contact (TOPCon), intrinsic thin-film heterojunction (HJT), interdigitated back contact (IBC), perovskite solar cells, etc.

[0032] For PERC cells, along their thickness direction, the PERC cell sequentially includes a front-surface silver electrode, a front-surface silicon nitride passivation layer, a phosphorus emitter layer, a P-type substrate silicon layer, a localized aluminum back field, a metallic aluminum back electrode, and a back passivation layer (Al2O3 / SiNx). PERC cells use a passivation film to passivate the back side, replacing the all-aluminum back field, enhancing light reflection within the silicon substrate, reducing the recombination rate on the back side, and improving the cell efficiency by 0.5%-1%.

[0033] For a TOPCon cell, along its thickness direction, it sequentially comprises a silver electrode, a front-surface silicon nitride passivation layer, a boron-doped emitter, an N-type substrate silicon layer, a diffused doped layer, an ultrathin silicon oxide layer, doped polycrystalline silicon, silicon nitride, and the silver electrode. The back of the cell consists of an ultrathin silicon oxide layer (1nm–2nm) and a phosphorus-doped microcrystalline amorphous mixed Si film, which together form a passivation contact structure. This structure blocks minority carrier recombination, increasing the cell's open-circuit voltage and short-circuit current. The ultrathin oxide layer allows majority carrier electrons to tunnel into the polycrystalline silicon layer while simultaneously blocking minority carrier recombination. The excellent passivation effect of the ultrathin silicon oxide and heavily doped silicon film causes band bending on the silicon wafer surface, creating a field passivation effect. This significantly increases the probability of electron tunneling, reduces contact resistance, and improves the cell's open-circuit voltage and short-circuit current, thereby enhancing the cell's conversion efficiency.

[0034] For an HJT cell, along its thickness direction, the HJT cell sequentially includes a front low-temperature silver electrode, a front conductive film, an N-type amorphous silicon film, an intrinsic amorphous silicon film, an N-type substrate silicon layer, an intrinsic amorphous silicon film, a P-type amorphous silicon film, a back conductive film, and a back low-temperature silver electrode.

[0035] For an IBC cell, along its thickness direction, it sequentially includes a silicon nitride inversion layer, an N+ front surface field, an N-type substrate silicon layer, a P+ emitter, an N+ back field, an aluminum oxide passivation layer, a silicon nitride antireflection layer, and a silver electrode. IBC cells utilize ion implantation technology to obtain P- and N-regions with good uniformity and precisely controllable junction depth. The absence of grid lines on the front side eliminates light-blocking current loss from the metal electrodes, maximizing the utilization of incident photons and improving short-circuit current by approximately 7% compared to conventional solar cells. Due to its back-contact structure, grid line shading is not a concern, allowing for a wider grid line ratio, thus reducing series resistance and achieving a high fill factor. Optimized design of surface passivation and light-trapping structures can be achieved, resulting in lower front surface recombination rates and surface reflection.

[0036] For a perovskite solar cell, along its thickness direction, it sequentially comprises a substrate material, a conductive thin film, an electron transport layer (titanium dioxide), a perovskite absorption layer (hole transport layer), and a metal cathode. Perovskite materials possess a high light absorption coefficient and a long carrier diffusion distance. After the photons absorbed by the perovskite material are converted into electrons, they are easily collected by the electrodes with minimal loss, thus generating high photogenerated voltage and current, resulting in high photoelectric conversion efficiency.

[0037] The surface of the aforementioned solar cell 111 can be provided with grid lines, which may include intersecting (usually perpendicular) main grid lines and sub-grid lines. The main grid lines and sub-grid lines are typically formed by printing and sintering a metal paste (e.g., silver paste). The sub-grid lines can be used to collect and conduct current on the solar cell, while the main grid lines can be used to collect current on the sub-grid lines for current collection. To improve the power generation efficiency of the photovoltaic module and reduce costs, the solar cell 111 can be a multi-busbar (MBB) solar cell, meaning that multiple main grid lines are printed on the surface of the solar cell 111. Multi-busbar technology increases the number of main grid lines, thereby reducing the number of sub-grid lines and lowering costs. Simultaneously, it can shorten the current conduction path between the sub-grid lines and the main grid lines, reducing power loss and thus increasing the power of the solar cell.

[0038] The aforementioned solar cell 111 can also be a busbar-less (OBB) solar cell. Solar cell 111 can use solder strips to replace the original main busbar lines, that is, the solder strips can be directly connected to the auxiliary busbar lines. Since there is no need to set up main busbar lines, the consumption of metal paste is reduced, thereby reducing the production cost of photovoltaic modules.

[0039] like Figure 2 As shown, in one possible implementation, along the width direction Y of the photovoltaic module 1, the spacing D1 between adjacent cell strings 11 satisfies: 1.2mm≤D1≤2mm.

[0040] The spacing D1 can be 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm, 1.9mm, 1.95mm or 2mm, or other values ​​within the above range. When the size of D1 is too small, the distance between adjacent cell strings 11 is too close, which can be understood as the distance between cell 111 being too close. When the photovoltaic module 1 receives sunlight, one cell 111 is easily shaded by the shadows of other cells 111, thus affecting the photoelectric conversion efficiency of the photovoltaic module 1. At the same time, a small size of D1 also poses safety hazards to the cell 111, such as the cell 111 being prone to short circuits, thus affecting the performance of the cell 111. When the size of D2 is too large, the area of ​​the photovoltaic module 1 that cannot perform effective photoelectric conversion increases, leading to a decrease in the power generation efficiency of the photovoltaic module 1 and affecting the power output of the photovoltaic module 1. The embodiments of this application design the spacing D1 between adjacent cell strings 11 to be within a reasonable range, ensuring the normal and stable operation of each cell 111 while increasing the area ratio of the cell 111, thereby improving the power generation efficiency of the photovoltaic module 1 and increasing the output power of the photovoltaic module 1.

[0041] like Figure 2 As shown, in one possible implementation, the length L of the photovoltaic module 1 satisfies: 2374mm ≤ L ≤ 2394mm. Each battery string 11 has N battery cells 111 arranged along the length direction X of the photovoltaic module 1, where N satisfies: 16 ≤ N ≤ 48.

[0042] The N solar cells 111 in the solar cell string 11 can be electrically and mechanically connected via solder strips (not shown in the figure). The number N of solar cells 111 can be 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, or 48, or other values ​​within the above range. Arranging a reasonable number of solar cells 111 in the solar cell string 11 helps to improve the output power of the photovoltaic module 1.

[0043] The length L of the photovoltaic module 1 can be 2374mm, 2376mm, 2378mm, 2380mm, 2381mm, 2382mm, 2383mm, 2384mm, 2385mm, 2386mm, 2387mm, 2388mm, 2389mm, 2390mm, 2392mm, or 2394mm, or other values ​​within the above range. By designing the length of the photovoltaic module 1, sufficient space is provided for the arrangement of the solar cells 111, improving the stability and reliability of the solar cells 111 within the photovoltaic module 1, thereby enabling the photovoltaic module 1 to operate normally and stably.

[0044] In some embodiments, the photovoltaic module 1 may have 8 battery strings 11, and each battery string 11 may have 26 battery cells 111. That is, the photovoltaic module 1 has 208 battery cells 111 arranged inside. This design can effectively improve the power generation efficiency and output power of the photovoltaic module 1, so as to facilitate the use of the photovoltaic module 1.

[0045] In other embodiments, the photovoltaic module 1 may have 8 battery strings 11, and each battery string 11 may have 34 battery cells 111. That is, the photovoltaic module 1 has 272 battery cells 111 arranged inside. This design can effectively improve the power generation efficiency and output power of the photovoltaic module 1, while also reducing the power generation cost of the photovoltaic module 1, which further facilitates the use of the photovoltaic module 1.

[0046] In some embodiments, the width W of the photovoltaic module 1 satisfies: 2234mm ≤ W ≤ 2254mm, and the length L of the photovoltaic module 1 satisfies: 2374mm ≤ L ≤ 2394mm. The shape of the photovoltaic module 1 can be approximately square, that is, the difference between the width and length dimensions of the photovoltaic module 1 is small. Photovoltaic modules with this size have high reliability and are less affected by external moisture erosion. Specifically, during use, external moisture can easily penetrate into the photovoltaic module from its outer edge and corrode the cells, leading to a decrease in the output power of the photovoltaic module. As can be seen from the above, the perimeter of the photovoltaic module 1 in this embodiment is approximately 9m, so the power lost by the photovoltaic module 1 due to moisture erosion is approximately 9W. As mentioned above, the output power of the photovoltaic module 1 in this embodiment can reach 1200W. Therefore, the power lost by the photovoltaic module 1 due to moisture erosion accounts for 9 / 1200. In related technologies, the size of photovoltaic modules is smaller (i.e., the perimeter of the photovoltaic module is smaller), approximately 7m, and its output power is approximately 600W. Under the same water vapor erosion, the photovoltaic module loses approximately 7W of power due to water vapor erosion. Therefore, the power loss due to water vapor erosion accounts for 7 / 600. Clearly, the power loss of photovoltaic module 1 in this embodiment is relatively small, meaning that photovoltaic module 1 in this embodiment is less affected by water vapor erosion and can still maintain a high output power under the influence of water vapor erosion, thus exhibiting higher reliability.

[0047] Photovoltaic modules are typically placed on pallets during transportation. The pallets help secure the modules, improving their stability during transport. A single pallet can hold multiple photovoltaic modules. For example... Figure 3As shown, the photovoltaic module 01 in the related technology is approximately rectangular in shape, meaning that there is a significant difference between its length and width. For example, the width of the photovoltaic module 01 is approximately 1100mm, and its length is approximately 2300mm. During transportation, the photovoltaic module 01 is typically placed horizontally on a pallet 02 to prevent it from tipping over. The height of the container 03 transporting the photovoltaic module 01 is approximately 2.6m. Generally, the photovoltaic modules 01 can be stacked along the height direction Z of the container 03. For example, two rows of photovoltaic modules 01 can be stacked along the height direction Z of the container 03. Each row of photovoltaic modules 01 has a pallet 02 at its bottom. In other words, two rows of photovoltaic modules 01 require two pallets 02, and the pallets 02 also occupy some space inside the container 03. Therefore, the photovoltaic module 01 in the related technology has a low space utilization rate within the container 03, resulting in high transportation costs. As mentioned above, the photovoltaic module 1 in this embodiment is approximately square in shape. This design makes the center of gravity of the photovoltaic module 1 more stable, thus preventing it from tipping over during transportation. As can be seen from the above, the width and length of the photovoltaic module 1 in this embodiment both reach 2m. Therefore, if... Figure 4 As shown, in the height direction Z of container 3, only one row of photovoltaic modules 1 can be arranged. Compared with the above-mentioned related technologies that arrange two rows of photovoltaic modules, the embodiment of this application can save the number of pallets 2, thereby saving the space inside container 3. This allows the photovoltaic modules 1 to make full use of the space inside container 3, so that more photovoltaic modules 1 can be stored inside container 3, thereby improving the transportation efficiency of photovoltaic modules 1 and reducing the transportation cost of photovoltaic modules 1.

[0048] like Figure 2 As shown, in one possible implementation, the width w of the solar cell 111 satisfies: 47.7mm ≤ w ≤ 142.7mm. For example, w can be 47.7mm, 48mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 125mm, 130mm, 135mm, 140mm, 141mm, or 142.7mm, or other values ​​within the above range. This embodiment of the application designs the width of the solar cell 111 to increase its area, that is, to increase the area of ​​the photoelectric conversion region on the photovoltaic module 1, so that the photovoltaic module 1 can fully utilize the received sunlight, thereby increasing the output power of the photovoltaic module 1 and improving its performance.

[0049] In some embodiments, the length l of the solar cell 111 satisfies: 265mm≤l≤285mm, and the width w of the solar cell 111 satisfies: 47.7mm≤w≤142.7mm. This design allows the solar cell 111 to have a larger area, which is beneficial to improving the output power of the photovoltaic module 1.

[0050] like Figure 2 As shown, in one possible implementation, along the length direction X of the photovoltaic module 1, the spacing D2 of adjacent cells 111 in any cell string 11 satisfies: 0.6mm≤D2≤1mm.

[0051] The spacing D2 between adjacent cells 111 in the same cell string 11 can be 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 1mm, or other values ​​within the above range. When the size of D2 is too small, the distance between adjacent cells 111 in the same cell string 11 is too close. When the photovoltaic module 1 receives sunlight, one cell 111 is easily shaded by the shadows of other cells 111, thus affecting the photoelectric conversion efficiency of the photovoltaic module 1. At the same time, a small size of D2 also poses safety hazards to the cells 111, such as the cells 111 being prone to short circuits, thus affecting the performance of the cells 111. When the size of D2 is too large, the area on the photovoltaic module 1 that cannot perform effective photoelectric conversion increases, leading to a decrease in the power generation efficiency of the photovoltaic module 1 and affecting the power output of the photovoltaic module 1. This application embodiment designs the spacing D2 between adjacent cells 111 within the same battery string 11 to keep it within a reasonable range. While ensuring the normal and stable operation of each cell 111, it also increases the area ratio of the cell 111, thereby improving the power generation efficiency of the photovoltaic module 1 and increasing the output power of the photovoltaic module 1.

[0052] In one possible implementation, along the width direction Y of the photovoltaic module 1, the creepage distance P1 from the edge of the cell 111 to the edge of the cover plate 12 of the photovoltaic module 1 satisfies: 13.8mm≤P1≤14.8mm, and / or; along the length direction X of the photovoltaic module 1, the creepage distance P2 from the edge of the cell 111 to the edge of the cover plate 12 of the photovoltaic module 1 satisfies: 20.3mm≤P2≤22.3mm.

[0053] Along the width direction Y of the photovoltaic module 1, the creepage distance P1 from the edge of the cell 111 to the edge of the cover plate 12 of the photovoltaic module 1 can be 13.8mm, 13.9mm, 14mm, 14.1mm, 14.2mm, 14.3mm, 14.4mm, 14.5mm, 14.6mm, 14.7mm or 14.8mm, or other values ​​within the above range.

[0054] Along the length direction X of the photovoltaic module 1, the creepage distance P2 from the edge of the cell 111 to the edge of the cover plate 12 of the photovoltaic module 1 can be 20.3mm, 20.5mm, 20.7mm, 20.9mm, 21mm, 21.2mm, 21.4mm, 21.6mm, 21.8mm, 22mm, 22.1mm, 22.2mm or 22.3mm, or other values ​​within the above range.

[0055] By limiting the creepage distances P1 and P2, while meeting the creepage distance requirements of the solar cell 111, the distance between the solar cell 111 and the edge of the photovoltaic module 1 (i.e. the edge of the cover plate 12) can be minimized to increase the area ratio of the solar cell 111 in the photovoltaic module 1, thereby increasing the output power of the photovoltaic module 1.

[0056] like Figure 5 As shown, in one possible implementation, the battery cell 111 has M main bus lines 112, where M satisfies: 22≤M≤33.

[0057] The main busbar 112 collects and conducts the current from the solar cell 111, facilitating the output of the electrical energy generated by the solar cell 111. The number M of the main busbar 112 can be 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, or 33. This design facilitates the collection and conduction of current from the solar cell 111 by the main busbar 112, reduces current transmission losses, and improves current transmission efficiency. Simultaneously, by designing the number of main busbars 112, the shading area of ​​the main busbars 112 is reduced, thereby improving the power generation efficiency of the solar cell 111, and consequently, increasing the overall power generation efficiency and output power of the photovoltaic module 1.

[0058] like Figure 5 As shown, in one possible implementation, the spacing D3 between adjacent main grid lines 112 satisfies: 8.6mm ≤ D3 ≤ 12.9mm.

[0059] The spacing D2 can be 8.6mm, 8.8mm, 9mm, 9.4mm, 9.8mm, 10mm, 10.4mm, 10.8mm, 11mm, 11.4mm, 11.8mm, 12mm, 12.4mm, 12.8mm, or 12.9mm, or other values ​​within the above range. This design facilitates the collection and conduction of current generated by the solar cell 111 by the main grid line 112, thereby improving the power generation efficiency of the solar cell 111.

[0060] like Figure 6As shown, in one possible implementation, the photovoltaic module 1 includes a busbar 17, through which the battery strings 11 are electrically connected. The busbar 17 enables series and parallel connection of the battery strings 11 and can output the electrical energy generated by the battery strings 11. The main body of the busbar 17 can be a conductive metal, such as copper, aluminum, or silver. The cross-section of the busbar 17 can be rectangular, circular, or triangular.

[0061] The width d of the busbar 17 satisfies the condition: 3.5mm ≤ d ≤ 22.5mm. Specifically, the width d of the busbar 17 can be 3.5mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, or 22.5mm, or other values ​​within the above range. When the width d of the busbar 17 is too small, the structural strength of the busbar 17 is low, its reliability is poor, and its service life is short, which can easily affect the normal operation of the photovoltaic module 1. When the width d of the busbar 17 is too large, the area of ​​the busbar 17 is large, reducing the area ratio of the solar cells 111, thus affecting the power generation efficiency of the photovoltaic module 1. The embodiments of this application design the width of the busbar 17 to satisfy the structural stability and reliability of the busbar 17 while also giving the busbar 17 a more reasonable area, which is conducive to increasing the area ratio of the solar cells 111 in the photovoltaic module 1, thereby improving the power generation efficiency and output power of the photovoltaic module 1.

[0062] The thickness h of the busbar 17 satisfies the condition: 0.275mm ≤ h ≤ 0.575mm. Specifically, the thickness h of the busbar 17 can be 0.275mm, 0.28mm, 0.29mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, or 0.575mm, or other values ​​within the above range. When the thickness h of the busbar 17 is too small, the structural strength of the busbar 17 is low, the reliability is poor, and the current transmission efficiency is also affected. When the thickness h of the busbar 17 is too large, it can easily affect the normal encapsulation and lamination of the photovoltaic module 1, and also increase the production cost of the photovoltaic module 1. The embodiments of this application design the thickness of the busbar 17 to ensure the normal production of the photovoltaic module 1, while also improving the structural stability and reliability of the busbar 17 and ensuring the current transmission efficiency of the busbar 17.

[0063] In one possible implementation, the length of the photovoltaic module 1 is L; the sum of the dimensions of the cells 111 in each cell string 11 along the length direction X of the photovoltaic module 1 is A, that is, A is the sum of the width dimensions of each cell 111 in the same cell string 11, and A and L satisfy: 0.95≤A / L≤0.98.

[0064] The A / L ratio can be 0.95, 0.955, 0.96, 0.965, 0.97, 0.975, or 0.98, or other values ​​within the aforementioned range. This design provides sufficient space for the arrangement of the solar cells 111 within the cell string 11, improving the stability and reliability of the cells 111 within the photovoltaic module 1, thus ensuring the normal and stable operation of the photovoltaic module 1. Furthermore, by designing the sum of the width dimensions of each cell 111 within the same cell string 11, the cells 111 achieve a reasonable width, which helps increase the overall area ratio of the cells 111, thereby improving the output power and power generation efficiency of the photovoltaic module 1.

[0065] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A photovoltaic module, characterized in that, The width W of the photovoltaic module (1) satisfies: 2234mm≤W≤2254mm, and the length L of the photovoltaic module (1) satisfies: 2374mm≤L≤2394mm; The photovoltaic module (1) includes at least eight battery strings (11) arranged along the width direction of the photovoltaic module (1), each battery string (11) including a battery cell (111), the length l of the battery cell (111) satisfying: 265mm≤l≤285mm; Along the width direction of the photovoltaic module (1), the spacing D1 between adjacent battery strings (11) satisfies: 1.2mm≤D1≤2mm; Along the width direction of the photovoltaic module (1), the creepage distance P1 from the edge of the cell (111) to the edge of the cover plate (12) of the photovoltaic module (1) satisfies: 13.8mm≤P1≤14.8mm, and / or, along the length direction of the photovoltaic module (1), the creepage distance P2 from the edge of the cell (111) to the edge of the cover plate (12) of the photovoltaic module (1) satisfies: 20.3mm≤P2≤22.3mm; The spacing D2 between adjacent battery cells (111) in any of the battery strings (11) satisfies: 0.6mm≤D2≤1mm.

2. The photovoltaic module according to claim 1, characterized in that, Each of the battery strings (11) has N battery cells (111) arranged along the length of the photovoltaic module (1), where N satisfies: 16≤N≤48.

3. The photovoltaic module according to claim 2, characterized in that, The width w of the battery cell (111) satisfies: 47.7mm≤w≤142.7mm.

4. The photovoltaic module according to claim 1, characterized in that, The solar cell (111) has M main bus lines (112), where M satisfies: 22≤M≤33.

5. The photovoltaic module according to claim 4, characterized in that, The spacing D3 between adjacent main grid lines (112) satisfies: 8.6mm≤D3≤12.9mm.

6. The photovoltaic module according to any one of claims 1 to 5, characterized in that, The photovoltaic module (1) includes a busbar (17), and the battery strings (11) are electrically connected to each other through the busbar (17); The width d of the busbar (17) satisfies: 3.5mm ≤ d ≤ 22.5mm, and / or; The thickness h of the busbar (17) satisfies: 0.275mm≤h≤0.575mm.

7. The photovoltaic module according to any one of claims 1 to 5, characterized in that, The length of the photovoltaic module (1) is L; The sum of the dimensions of the cells (111) in each of the battery strings (11) along the length of the photovoltaic module (1) is A; A and L satisfy: 0.95≤A / L≤0.98.

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