A photovoltaic module

Abstract

The application relates to a photovoltaic module, the width W of the photovoltaic module satisfies 1130mm<=W<=1310mm, the photovoltaic module comprises at least four cell strings arranged along the width direction of the photovoltaic module, and the cell string comprises a cell, and the length l of the cell satisfies 270mm<=l<=320mm. Through the design of the size of the photovoltaic module, the reliability of the photovoltaic module as a whole is improved, the stability of the structure is improved, the service life of the photovoltaic module is prolonged, the normal and stable use of the photovoltaic module is ensured, the size of the cell is increased, the area of the photoelectric conversion region on the photovoltaic module is increased, and therefore the output power of the photovoltaic module and the photoelectric conversion efficiency are improved.

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 can convert solar energy into electrical energy; however, the output power of photovoltaic modules is relatively low and cannot meet the needs of use. Summary of the Invention

[0003] In view of this, this application provides a photovoltaic module to help solve the problem of low output power of photovoltaic modules in the prior art.

[0004] This application provides a photovoltaic module, wherein the width W of the photovoltaic module satisfies: 1130mm≤W≤1310mm; the photovoltaic module includes at least four battery strings arranged along the width direction of the photovoltaic module, the battery strings include batteries, and the length l of the battery cells satisfies: 270mm≤l≤320mm.

[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: 2380mm≤L≤2385mm; each of the battery strings has N battery cells arranged along the length direction of the photovoltaic module, where N satisfies: 14≤N≤38.

[0007] In one possible implementation, the width w of the battery cell satisfies: 60.5mm ≤ w ≤ 163.8mm.

[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: 0.5mm ≤ 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: 13.7mm ≤ P1 ≤ 14.9mm; and / or,

[0010] Along the length of the photovoltaic module, the creepage distance P2 from the edge of the cell to the edge of the cover plate of the photovoltaic module satisfies: 20.1mm≤P1≤23mm.

[0011] In one possible implementation, the solar cell has M main bus lines, where M satisfies: 22 ≤ M ≤ 37.

[0012] In one possible implementation, the photovoltaic module includes a busbar, and the battery strings are electrically connected through the busbar, wherein the width d of the busbar satisfies: 2.5mm ≤ d ≤ 25mm.

[0013] In one possible implementation, the thickness h of the busbar satisfies: 0.25 ≤ h ≤ 0.6 mm.

[0014] 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.

[0015] This application provides a photovoltaic module with a width W satisfying: 1130mm ≤ W ≤ 1310mm. The photovoltaic module includes at least four cell strings arranged along its width direction, each cell string containing cells. The length l of each cell satisfies: 270mm ≤ l ≤ 320mm. This application also provides a high-output-power photovoltaic module. By increasing the size of the cells, the area of ​​the photovoltaic module undergoing photoelectric conversion is increased, thereby improving the output power and photoelectric conversion efficiency of the photovoltaic module to meet the usage requirements. Simultaneously, by designing the dimensions of the photovoltaic module, the overall reliability and structural stability of the photovoltaic module are improved, extending its service life and ensuring its normal and stable use.

[0016] 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

[0017] 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.

[0018] Figure 1 This is a schematic diagram of a photovoltaic module in one embodiment of this application;

[0019] Figure 2 This is a partial schematic diagram of the arrangement of solar cells in a photovoltaic module according to one embodiment of this application;

[0020] Figure 3 This is a partial schematic diagram of a battery cell in one embodiment of this application;

[0021] Figure 4 This is a partial schematic diagram of the connection between the battery string and the busbar in one embodiment of this application;

[0022] Figure 5 This is an exploded view of a photovoltaic module 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 1 As shown, this application embodiment provides a photovoltaic module 1, which can convert solar energy into electrical energy. The width W of the photovoltaic module 1 satisfies: 1130mm ≤ W ≤ 1310mm. For example, W can be 1130mm, 1140mm, 1150mm, 1160mm, 1170mm, 1180mm, 1190mm, 1200mm, 1210mm, 1220mm, 1230mm, 1240mm, 1250mm, 1260mm, 1270mm, 1280mm, 1290mm, 1300mm, or 1310mm, or other values ​​within the above range.

[0028] The length L of photovoltaic module 1 satisfies: 2380mm≤L≤2385mm, for example, 2380mm, 2380.5mm, 2381mm, 2381.5mm, 2382mm, 2382.5mm, 2383mm, 2383.5mm, 2384mm, 2384.5mm or 2385mm, and of course, it can also be other values ​​within the above range.

[0029] When the width and / or length of the photovoltaic module 1 is too large, the reliability of the photovoltaic module 1 will decrease, thereby affecting its service life. For example, if the glass cover plate 12 on the surface of the photovoltaic module 1 is too large, its load-bearing capacity will decrease, resulting in a weakened hail resistance and affecting the normal use of the photovoltaic module 1. At the same time, the structural stability of the photovoltaic module 1 will also decrease. For example, the photovoltaic module 1 is prone to bending and deformation, increasing the difficulty of its transportation and installation. The embodiments of this application limit the width and length of the photovoltaic module 1, keeping the overall size of the photovoltaic module 1 within a reasonable range, thereby improving the reliability and stability of the photovoltaic module 1 and ensuring its normal and stable operation.

[0030] Continue to refer to Figure 1 In some embodiments, the photovoltaic module 1 includes at least four battery strings 11 arranged along the width direction Y of the photovoltaic module 1. The battery strings 11 can be connected in series or in parallel. For example, every two battery strings 11 can be connected in series to form a battery string group. Each battery string group can be connected in parallel with a diode (not shown in the figure). The diode can protect the circuit and improve the reliability of the photovoltaic module 1.

[0031] A battery string 11 contains N solar cells 111 arranged along the length X of the photovoltaic module 1. Each solar cell 111 performs photoelectric conversion. Solar cells 111 within the same battery string 11 can be connected in series. The number N of solar cells 111 satisfies the condition: 14 ≤ N ≤ 38. Specifically, N can be 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, or 38, or other values ​​within this range. Designing the number of solar cells 111 improves the photoelectric conversion efficiency of the photovoltaic module 1 and increases its output power, thus meeting the usage requirements of the photovoltaic module 1.

[0032] like Figure 2 As shown, in some embodiments, the length l of the battery cell 111 satisfies: 270mm ≤ l ≤ 320mm. For example, l can be 270mm, 272mm, 275mm, 277mm, 280mm, 282mm, 285mm, 287mm, 290mm, 292mm, 295mm, 297mm, 300mm, 302mm, 305mm, 307mm, 310mm, 312mm, 315mm, 317mm, or 320mm, or other values ​​within the above range.

[0033] In related technologies, the length of the solar cell 111 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.

[0034] In some embodiments, the width w of the battery cell 111 satisfies: 60.5mm ≤ w ≤ 163.8mm. For example, w can be 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 125mm, 130mm, 135mm, 140mm, 145mm, 150mm, 155mm, 160mm, 162mm, or 163.8mm, or other values ​​within the above range.

[0035] By designing the width of the solar cell 111, the solar cell 111 can be arranged reasonably within the photovoltaic module 1, thereby improving the stability of the solar cell 111 arrangement. On the other hand, it also helps to increase the area of ​​the solar cell 111, thereby increasing the output power of the photovoltaic module 1 and improving the performance of the photovoltaic module 1.

[0036] This application provides a high-output power photovoltaic module 1, wherein by increasing the size of the solar cell 111, the area of ​​the photovoltaic module 1 for photoelectric conversion is increased, thereby improving the output power and photoelectric conversion efficiency of the photovoltaic module 1; at the same time, by designing the size of the photovoltaic module 1, the overall reliability and structural stability of the photovoltaic module 1 are improved, thereby extending the service life of the photovoltaic module 1 and ensuring the normal and stable use of the photovoltaic module 1.

[0037] When the length l of the solar cell 111 is 270mm to 320mm and the width w of the solar cell 111 is 60.5mm to 163.8mm, the solar cell 111 has a large area, thereby improving the photoelectric conversion efficiency and output power of the photovoltaic module 1. Specifically, in some embodiments, the width W of the photovoltaic module 1 satisfies: 1300mm ≤ W ≤ 1310mm, and the length L of the photovoltaic module 1 satisfies: 2380mm ≤ L ≤ 2385mm. The photovoltaic module 1 includes 4 strings of solar cells 11, wherein each string of solar cells 11 includes 20 solar cells 111, the length l of the solar cells 111 satisfies: 310mm ≤ l ≤ 320mm, and the width w of the solar cells 111 satisfies: 110mm ≤ w ≤ 120mm. The photovoltaic module 1 with this design has high output power, high stability and reliability, and a long service life.

[0038] In other embodiments, the width W of the photovoltaic module 1 satisfies: 1130mm ≤ W ≤ 1140mm, and the length L of the photovoltaic module 1 satisfies: 2380mm ≤ L ≤ 2385mm. The photovoltaic module 1 includes four cell strings 11, wherein each cell string 11 includes 26 cells 111, the length l of the cell 111 satisfies: 270mm ≤ l ≤ 280mm, and the width w of the cell 111 satisfies: 85mm ≤ w ≤ 95mm. The photovoltaic module 1 with this design has high output power, low power generation cost, high stability and reliability, and long service life.

[0039] In other embodiments, the width W of the photovoltaic module 1 satisfies: 1300mm ≤ W ≤ 1310mm, and the length L of the photovoltaic module 1 satisfies: 2380mm ≤ L ≤ 2385mm. The photovoltaic module 1 includes four battery strings 11, wherein each battery string 11 includes 38 solar cells 111, the length l of the solar cells 111 satisfies: 310mm ≤ l ≤ 320mm, and the width w of the solar cells 111 satisfies: 60mm ≤ w ≤ 65mm. The photovoltaic module 1 with this design has high output power, low power generation cost, high stability and reliability, and long service life.

[0040] like Figure 3As shown, main grid lines 112 can be printed on the surface of the solar cell 111 using silver paste. The main grid lines 112 can collect and conduct current. In some embodiments, the solar cell 111 has M main grid lines 112, where M satisfies: 22 ≤ M ≤ 37. For example, M can be 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, or 37. In related technologies, the number of main busbars 112 on the solar cell 111 is usually around 2 to 12. Compared with related technologies, the embodiments of this application increase the number of main busbars 112, so that the main busbars 112 can be distributed more evenly on the solar cell 111, shortening the current conduction path and improving the current collection efficiency of the solar cell 111, which is conducive to improving the overall power generation efficiency of the photovoltaic module 1. At the same time, by increasing the number of main busbars 112, the cross-sectional area of ​​a single main busbar 112 can be reduced, which is conducive to saving the consumption of silver paste and thus reducing the production cost of the photovoltaic module 1.

[0041] Continue as Figure 3 As shown, in some embodiments, the spacing D3 between adjacent main busbars 112 on the solar cell 111 satisfies: 8mm ≤ D3 ≤ 13.1mm. D3 can be 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, or 13.1mm, or other values ​​within the above range. This design allows the main busbars 112 to be arranged more evenly on the solar cell 111, facilitating the collection and conduction of the current generated by the solar cell 111, thereby improving the power generation efficiency of the solar cell 111.

[0042] In some embodiments, the thickness of the solar cell 111 is 90μm to 130μm, such as 90μm, 100μm, 105μm, 110μm, 115μm, 120μm, 125μm, or 135μm. This design helps to save on the amount of silicon material used, thereby reducing the production cost of the photovoltaic module 1. At the same time, it also helps to reduce the weight of the solar cell 111, thus achieving a lightweight design for the photovoltaic module 1, which facilitates the transportation and installation of the photovoltaic module 1. In addition, by limiting the thickness of the solar cell 111, the stability and reliability of the solar cell 111 structure are improved, which is conducive to the normal and stable operation of the photovoltaic module 1 as a whole.

[0043] 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.

[0044] 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%.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] like Figure 2As 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. 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.

[0052] like Figure 2As shown, in one possible implementation, along the length direction X of the photovoltaic module 1, the spacing D2 between adjacent cells 111 in any cell string 11 satisfies: 0.5mm ≤ D2 ≤ 1mm. Specifically, the spacing D2 between adjacent cells 111 in the same cell string 11 can be 0.5mm, 0.55mm, 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 spacing 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 spacing 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 spacing D2 is too large, the area of ​​the photovoltaic module 1 that cannot effectively convert light into electricity increases, leading to a decrease in the power generation efficiency of the photovoltaic module 1 and affecting its power output. This embodiment of the application designs the spacing D2 between adjacent cells 111 within the same cell string 11 to keep it within a reasonable range. This ensures the normal and stable operation of each cell 111 while also increasing the area ratio of the cells 111, thereby improving the power generation efficiency of the photovoltaic module 1 and increasing its output power.

[0053] like Figure 4 As shown, in one possible implementation, the photovoltaic module 1 includes a busbar 13, through which the cell strings 11 are electrically connected. The width d of the busbar 13 satisfies: 2.5mm ≤ d ≤ 25mm. For example, d can be 2.5mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm, 17mm, 19mm, 21mm, 23mm, or 25mm, or other values ​​within the above range. When the width d of the busbar 13 is too small, the structural strength of the busbar 13 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 13 is too large, the area of ​​the busbar 13 is large, reducing the area ratio of the cell 111, thus affecting the power generation efficiency of the photovoltaic module 1. The embodiment of this application designs the width of the busbar 13 to ensure the structural stability and reliability of the busbar 13, while also giving the busbar 13 a more reasonable area. This is beneficial to increasing the area ratio of the solar cells 111 inside the photovoltaic module 1, thereby improving the power generation efficiency and output power of the photovoltaic module 1.

[0054] In one possible implementation, the thickness h of the busbar 13 satisfies: 0.25 ≤ h ≤ 0.6 mm. For example, h can be 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, or 0.6 mm, or other values ​​within the above range. When the thickness h of the busbar 13 is too small, the structural strength of the busbar 13 is low, the reliability is poor, and the current transmission efficiency is also affected. When the thickness h of the busbar 13 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 13 to ensure the normal production of the photovoltaic module 1, while also improving the structural stability and reliability of the busbar 13 and ensuring the current transmission efficiency of the busbar 13.

[0055] In one possible implementation, the length of the photovoltaic module 1 is L, and 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, the sum of the width dimensions of each cell 111 in the same cell string 11 is A; A and L satisfy: 0.95≤A / L≤0.98.

[0056] The A / L ratio can be 0.95, 0.952, 0.955, 0.96, 0.952, 0.965, 0.957, 0.97, 0.972, 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 have 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.

[0057] like Figure 5As shown, the photovoltaic module 1 includes a cover plate 12, which protects the solar cells 111 from external damage. Specifically, the cover plate 12 can be a glass cover plate 12 with high light transmittance, allowing more sunlight to reach the surface of the solar cells 111, thereby improving the photoelectric conversion efficiency of the solar cells 111. Along the thickness direction Z of the photovoltaic module 1, the thickness of the cover plate 12 can be 1.5mm to 4mm to improve its structural strength. The surface of the cover plate 12 can be provided with an embossed structure (not shown in the figure), meaning the cover plate 12 has an uneven surface, allowing light to undergo diffuse reflection, which helps improve the utilization rate of sunlight by the photovoltaic module 1 and increases its power generation.

[0058] Simultaneously combined Figure 1 As shown, 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: 13.7mm≤P1≤14.9mm. For example, P1 can be 13.7mm, 13.8mm, 13.9mm, 14mm, 14.1mm, 14.2mm, 14.3mm, 14.4mm, 14.5mm, 14.6mm, 14.7mm, 14.8mm, or 14.9mm, or other values ​​within the above range.

[0059] 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: 20.1mm≤P1≤23mm, for example, 20.1mm, 20.2mm, 20.4mm, 20.6mm, 20.8mm, 21mm, 21.4mm, 21.8mm, 22mm, 22.4mm, 22.8mm or 23mm, or other values ​​within the above range.

[0060] 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.

[0061] Continue as Figure 5As shown, the cover plate 12 and the solar cell 111 can be connected by a first adhesive film 14. The first adhesive film 14 bonds the cover plate 12 and the solar cell 111 together, and also encapsulates and protects the solar cell 111. The material of the first adhesive film 14 can be polyolefin elastomer (POE). POE film has excellent water vapor barrier properties and anti-PID (potential-induced degradation) effect, and its aging process does not produce acidic substances, thereby improving the overall reliability of the photovoltaic module 1. The material of the first adhesive film 14 can also be ethylene-vinyl acetate copolymer (EVA) or polyvinyl butyral (PVB). Among them, EVA film can allow short-wavelength incident light to pass through more smoothly, thereby increasing the absorption and utilization rate of incident light by the solar cell 111.

[0062] The photovoltaic module 1 also includes a backsheet 16, which protects the solar cells 111 from external corrosion and typically has good insulation properties. The backsheet 16 can be made of glass, or it can be composed of multiple polymer film layers.

[0063] The backplate 16 and the battery cell 111 can be connected by a second adhesive film 15, which can be one or more of POE film, EVA film and PVB film.

[0064] In some embodiments, the first adhesive film 14 can be a POE adhesive film and the second adhesive film 15 can be an EVA adhesive film. In other embodiments, both the first adhesive film 14 and the second adhesive film 15 can be POE adhesive film or EVA adhesive film. In other embodiments, both the first adhesive film 14 and the second adhesive film 15 can be composite adhesive films. Specifically, the composite adhesive film can be composed of both POE adhesive film and EVA adhesive film.

[0065] In some embodiments, the thickness of the first encapsulant film 14 along the thickness direction Z of the photovoltaic module 1 can be 300μm to 500μm, for example, 300μm, 350μm, 400μm, 450μm or 500μm. This design improves the reliability of the first encapsulant film 14 and facilitates the overall lamination of the photovoltaic module 1 to achieve a stable and reliable connection between the cover plate 12 and the solar cell 111, and to reliably encapsulate and protect the solar cell 111.

[0066] In some embodiments, the thickness of the second encapsulant film 15 along the thickness direction Z of the photovoltaic module 1 can be 300μm to 700μm, for example, 300μm, 350μm, 400μm, 450μm, 500μm, 550μm, 600μm, 650μm, or 700μm. This design improves the reliability of the second encapsulant film 15 and facilitates the overall lamination of the photovoltaic module 1 to achieve a stable and reliable connection between the backsheet 16 and the solar cells 111, and provides reliable encapsulation and protection for the solar cells 111.

[0067] 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: 1130mm≤W≤1310mm, and the length L of the photovoltaic module (1) satisfies: 2380mm≤L≤2385mm; The photovoltaic module (1) includes at least four battery strings (11) arranged along the width direction of the photovoltaic module (1). Each battery string (11) includes a battery cell (111). The length l of the battery cell (111) satisfies: 270mm≤l≤320mm, and the width w of the battery cell (111) satisfies: 60.5mm≤w≤163.8mm. Along the width direction of the photovoltaic module (1), the spacing D1 between adjacent battery strings (11) satisfies: 1.2mm≤D1≤2mm; 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.

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: 14≤N≤38.

3. The photovoltaic module according to claim 1, characterized in that, Along the length direction of the photovoltaic module (1), the spacing D2 of adjacent cells (111) in any cell string (11) satisfies: 0.5mm≤D2≤1mm.

4. The photovoltaic module according to claim 1, characterized in that, Along the width direction of the photovoltaic module (1), the creepage distance P1 from the edge of the solar cell (111) to the edge of the cover plate (12) of the photovoltaic module (1) satisfies: 13.7mm ≤ P1 ≤ 14.9mm; and / or, Along the length 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: 20.1mm≤P1≤23mm.

5. 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≤37.

6. The photovoltaic module according to any one of claims 1 to 5, characterized in that, The photovoltaic module (1) includes a busbar (13), and the battery strings (11) are electrically connected through the busbar (13). The width d of the busbar (13) satisfies: 2.5mm≤d≤25mm.

7. The photovoltaic module according to claim 6, characterized in that, The thickness h of the busbar (13) satisfies: 0.25≤h≤0.6mm.

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