Photovoltaic module and photovoltaic system

Abstract

The embodiment of the utility model provides a photovoltaic module and a photovoltaic system, the photovoltaic module comprises a first side arranged along the length direction of the photovoltaic module and a second side arranged along the width direction of the photovoltaic module, the length of the first side is more than 1759 mm and less than 1765 mm, and the product of the first side and the second side does not exceed 1.998 square meters; the photovoltaic module comprises a plurality of battery pieces, each battery piece is provided with a third edge arranged in the length direction and a fourth edge arranged in the width direction, and the battery pieces are arranged in the length direction and the width direction according to an m * n rectangular array. In the length direction, the ratio of the sum of the lengths of the third edges of m battery pieces to the length of the first edges is more than 95% and less than 98%; and / or, in the width direction, the ratio of the sum of the lengths of the fourth edges of n battery pieces in the multiple battery pieces to the length of the second edges is more than 95% and less than 98%. The photovoltaic module provided by the utility model is more convenient to transport and install, has good mechanical load performance and also has proper power generation power.

Description

Technical Field

[0001] The present application relates to the photovoltaic field, and in particular to a photovoltaic module and a photovoltaic system. Background Art

[0002] Due to the clean and low-carbon advantages of photovoltaic panels, they have also been widely used in buildings. For example, they are installed on the roofs of various residential or commercial buildings to provide electricity for the buildings.

[0003] When the size of the photovoltaic module is too large, it is difficult to transport and install the module, which is easy to cause damage to the module. When the photovoltaic module is too large and too long, the risk of wind blowing increases when it is installed on the roof of the building. The photovoltaic module is too large and heavy, which poses a greater safety hazard in construction. When the size of the photovoltaic module is too small, the power generation of the entire photovoltaic module is small and it is difficult to meet the power demand.

[0004] Therefore, there is an urgent need in the market to design a photovoltaic module that is suitable for use in combination with buildings, has good mechanical load performance, and has a large power generation capacity. Utility Model Content

[0005] The present application provides a photovoltaic module and a photovoltaic system to solve the problem that the existing photovoltaic module size design cannot meet the requirements of both good mechanical load performance and high power generation when applied to buildings.

[0006] In order to solve the above problems, this application is implemented as follows:

[0007] The present application provides a photovoltaic module, comprising:

[0008] It has two first sides arranged along the length direction of the photovoltaic module and two second sides arranged along the width direction of the photovoltaic module, the length of the first side is greater than 1759 mm and less than 1765 mm, and the product of the length of the first side and the length of the second side does not exceed 1.998 square meters;

[0009] The photovoltaic module comprises a plurality of solar cells, each of which has a third side arranged along the length direction and a fourth side arranged along the width direction, and the plurality of solar cells are arranged in an m*n rectangular array along the length direction and the width direction;

[0010] In the length direction, the ratio of the sum of the lengths of the third sides of the m battery cells in the plurality of battery cells to the length of the first side is greater than 95% and less than 98%; and / or,

[0011] In the width direction, the ratio of the sum of the lengths of the fourth sides of n of the multiple solar cells to the length of the second side is above 95% and below 98%.

[0012] Optionally, the ratio of the sum of the lengths of the third sides of m of the multiple solar cells to the length of the first side is B1, and the ratio of the sum of the lengths of the fourth sides of n of the multiple solar cells to the length of the second side is B2;

[0013] B1 > B2; or, B1 < B2; or, |B1 - B2| ≤ 0.8%.

[0014] Optionally, the product of the length of the first side and the length of the second side is above 1.698 square meters; and / or,

[0015] The length of the third side is within the range of 94 ± 3 mm, and the length of the fourth side is within the range of 182.2 ± 5 mm; and / or,

[0016] m = 18, n = 6, and the multiple solar cells are arranged in a 18*6 rectangular array along the length direction and the width direction.

[0017] Optionally, the mass of the photovoltaic module is above 21 kg and below 26 kg; and / or,

[0018] The output power of the photovoltaic module is above 435 W and below 465 W.

[0019] Optionally, the photovoltaic module is a single-glass module, and the mass of the photovoltaic module is above 21 kg and below 23 kg; or,

[0020] The photovoltaic module is a double-glass module, and the mass of the photovoltaic module is above 23 kg and below 26 kg.

[0021] Optionally, the ratio of the length of the first side to the length of the second side is above 1.58 and below 1.76; and / or,

[0022] The ratio of the length of the fourth side to the length of the third side is above 1.91 and below 1.97.

[0023] Optionally, the photovoltaic module includes a laminate and a frame located at the edge of the laminate;

[0024] The wall thickness of the profile of the frame is 1.2 mm to 1.5 mm; and / or,

[0025] Along the thickness direction of the laminate, the height of the frame is 30 mm; and / or,

[0026] The frame of one side of the photovoltaic module is a frame without an A surface.

[0027] Optionally, in the length direction, the plurality of cells are divided into two parts, the shortest distance between the edge of the first side of the photovoltaic module and the edge of the cell in the first part is d1, and the shortest distance between the edge of the same first side of the photovoltaic module and the edge of the cell in the second part is d2;

[0028] K<|d1-d2|<1, where K is the width of the interconnection strip in the photovoltaic module.

[0029] Optionally, in the length direction, the plurality of solar cells are divided into two parts, and the photovoltaic assembly further comprises a first busbar disposed at both ends of the photovoltaic assembly in the length direction, and a second busbar disposed in a gap between the two parts;

[0030] Wherein, the ratio of the width of the second busbar to the width of the first busbar is greater than 1.7 and less than 2; and / or,

[0031] A ratio of the shortest distance between the edge of the first busbar and the edge of the battery cell to the shortest distance between the second busbar and the edge of the battery cell is greater than 0.8 and less than 1.

[0032] Optionally, in the length direction, the plurality of solar cells are divided into two parts, the photovoltaic module further comprises a back plate, the back plate is provided with three outlet holes, the three outlet holes are distributed in the gap between the two parts, and the three outlet holes are arranged along the width direction;

[0033] Among the three outlet holes, the shape of the outlet hole located in the middle is different from the shape of the outlet holes located on both sides; and / or,

[0034] The shape of the outlet hole located in the middle of the three outlet holes is elliptical or quasi-elliptical, and the shapes of the outlet holes located on both sides are circular; and / or,

[0035] The outlet hole located in the middle of the three outlet holes has a long axis and a short axis that are perpendicular to each other, the long axis is parallel to the width direction of the photovoltaic module, and the short axis is parallel to the length direction of the photovoltaic module; the cross-sectional shape of the outlet hole located in the middle of the three outlet holes includes a first arc, a second arc, a third arc and a fourth arc, the first arc and the second arc are symmetrical with respect to the short axis and are cocircular, and the third arc and the fourth arc are symmetrical with respect to the long axis and are coelliptical; and / or,

[0036] The battery sheet has a chamfered structure at a position close to the wire outlet hole.

[0037] Optionally, the number of main grids provided on each of the solar cells is greater than 16 and less than 20; and / or,

[0038] Each of the solar cells is provided with a plurality of main grids, and the number of the welding pads provided on each main grid is greater than 6 and less than 9; and / or,

[0039] The number of positive electrode fine grids provided on each of the battery cells is greater than 98 and less than 103; and / or,

[0040] The number of negative electrode fine grids provided on each of the battery cells is greater than 99 and less than 104; and / or,

[0041] A plurality of fine grids are arranged on each of the battery cells, and the distance between two adjacent fine grids with the same polarity is greater than 0.92 mm and less than 0.96 mm; and / or,

[0042] The positive main grid and the negative main grid of the battery cell are arranged on the back side of the battery cell.

[0043] Optionally, the plurality of battery cells form a plurality of battery strings;

[0044] Along the width direction, the string spacing between two adjacent battery strings is greater than 0.8 mm and less than 2 mm; and / or,

[0045] Along the length direction, the spacing between two adjacent battery cells in the same battery string is greater than 0.5 mm and less than 2 mm; and / or,

[0046] The string spacing between two adjacent battery strings is greater than the cell spacing between two adjacent battery cells in the same battery string.

[0047] Optionally, the photovoltaic assembly further comprises a bus bar connecting the battery strings and an interconnect bar connecting two battery sheets;

[0048] The interconnection strip is a flat interconnection strip; and / or,

[0049] The width of the interconnection strip is greater than 0.4 mm and less than 1 mm; and / or,

[0050] The overlapping length of the interconnection bar and the bus bar is greater than 2.8 mm and less than 3.5 mm.

[0051] The present application also provides a photovoltaic system, comprising a plurality of photovoltaic components as described above arranged in an array.

[0052] Optionally, the photovoltaic module is glued to a building; or,

[0053] The photovoltaic module is fixed to the building via a connector; or,

[0054] The photovoltaic components are mounted on the building.

[0055] The photovoltaic modules in the embodiments of the present application can obtain photovoltaic modules with more reasonable length and width dimensions by redesigning the long sides of the photovoltaic modules and the module area. Such modules are easier to transport and install due to their appropriate area size. When installed and fixed on a building, the risk of wind uplift caused by the overall module size being too large can be reduced, and insufficient power generation caused by the overall module size being too small can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0057] Figure 1 A schematic diagram showing the overall structure of a photovoltaic module according to an embodiment of the present application;

[0058] Figure 2 Indicates the embodiment of the present application Figure 1 A partial enlarged schematic diagram of the middle I position;

[0059] Figure 3 Indicates the embodiment of the present application Figure 1 A partial enlarged schematic diagram of the middle II position;

[0060] Figure 4 A schematic diagram showing the back side of a photovoltaic module according to an embodiment of the present application;

[0061] Figure 5 Indicates the embodiment of the present application Figure 4 A partial enlarged schematic diagram of the middle III position;

[0062] Figure 6 Indicates the embodiment of the present application Figure 4 A partial enlarged schematic diagram of the middle IV position;

[0063] Figure 7 A schematic diagram showing a wire outlet hole located in the middle position according to an embodiment of the present application.

[0064] Description of reference numerals:

[0065] Battery cell -10, first busbar -30, second busbar -40, back plate -50, first edge -101, second edge -102, outlet hole -501, first arc line -501a, second arc line -501b, second arc line -501b, third arc line -501c, fourth arc line -501d. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0067] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0068] Reference Figure 1 and Figure 2 , the embodiment of the present application provides a photovoltaic assembly, including:

[0069] It has two first sides 101 arranged along the length direction X of the photovoltaic module, and two second sides 102 arranged along the width direction Y of the photovoltaic module, the length a1 of the first side 101 is greater than 1759 mm and less than 1765 mm, and the product of the length a1 of the first side 101 and the length b1 of the second side 102 does not exceed 1.998 square meters;

[0070] The photovoltaic module includes a plurality of cells 10, each of which has a third side 103 arranged along the length direction X and a fourth side 104 arranged along the width direction. The plurality of cells 10 are arranged in an m*n rectangular array along the length direction X and the width direction Y.

[0071] Optionally, in the length direction X, a ratio of the sum of the lengths a2 of the third sides 103 of m battery cells 10 in the plurality of battery cells 10 to the length a1 of the first side 101 is greater than 95% and less than 98%.

[0072] like Figure 1As shown in the figure, the photovoltaic module of the embodiment of the present application can be a rectangular module, in which the two sides parallel to the length direction X are the first sides 101, the two sides parallel to the width direction Y are the second sides 102, the length of the first side 101 is a1, and the length of the second side 102 is b1.

[0073] Wherein, a1 is designed to be 1759 mm≤a1≤1765 mm. For example, a1 can be 1759 mm, 1760 mm, 1761 mm, 1762 mm, 1763 mm, 1764 mm, 1765 mm, etc.

[0074] Normally, the width of a photovoltaic module is limited by installation and transportation, so the width of the photovoltaic module will not be too large. In this case, when the length of the photovoltaic module is too short (for example, less than 1759mm), the area of ​​the photovoltaic module will be smaller (the corresponding area of ​​the battery cell will be smaller), which is not conducive to improving the efficiency of the photovoltaic module; when the length of the photovoltaic module is too long (for example, more than 1765mm), the mechanical load performance of the photovoltaic module will be lower and the installation flexibility will be poor.

[0075] Based on the above, a1 is designed to be 1759mm≤a1≤1765mm, which can take into account the power, mechanical strength and installation flexibility of the photovoltaic module.

[0076] The product of a1 and b1 does not exceed 1.998 square meters. For example, the product of a1 and b1 may be 1.8 square meters, 1.93 square meters, 1.95 square meters, or 1.998 square meters.

[0077] For example, when a1=1759mm, b1=1136mm; when a1=1760mm, b1=1135mm; when a1=1761mm, b1=1135mm; when a1=1762mm, b1=1134mm; when a1=1763mm, b1=1133mm; when a1=1764mm, b1=1133mm; when a1=1765mm, b1=1132mm.

[0078] When the product of a1 and b1 is too large (that is, the area of ​​the photovoltaic module is too large, for example, 3 square meters), it is not conducive to the laying of photovoltaic modules on the building and to full laying. Moreover, if the photovoltaic modules are too large, they will be too heavy, which is not conducive to the installation and transportation of photovoltaic modules, especially for one person to install and carry.

[0079] Based on the above, the product of a1 and b1 in this application does not exceed 1.998 square meters, and the area is relatively small (that is, the module area does not exceed 1.998 square meters), which is conducive to achieving full coverage of the building. Furthermore, since the smaller area corresponds to a smaller weight, it is conducive to the installation and transportation of photovoltaic modules, especially for a single person to carry, lay, and install, which can improve installation efficiency and reduce installation risks.

[0080] Furthermore, if the photovoltaic module simultaneously satisfies 1759mm≤a1≤1765mm, and a1*b1≤1.998 square meters. In this case, compared with smaller photovoltaic modules, the photovoltaic module can have higher power, and compared with larger photovoltaic modules, the photovoltaic module has better mechanical strength and better building adaptability (easy to fully pave), and is more conducive to the installation and transportation of the photovoltaic module. Therefore, the photovoltaic module that meets the length limit and area limit of this application can take into account the module power, mechanical strength, and installation and transportation convenience, so that the photovoltaic module has a higher cost performance, and is particularly suitable for installation on buildings, such as on the roof of a building.

[0081] In addition, in the photovoltaic module of this specification and size provided in the embodiment of the present application, multiple solar cells 10 are arranged along the length direction and width direction of the module to form an m*n rectangular array. Figure 1 and Figure 2 , each battery cell 10 has a third side 103 along the length direction X and a fourth side 104 along the width direction Y, the length of the third side 103 is a2, and the length of the fourth side 104 is b2. Along the length direction X of the module, m battery cells 10 are arranged in a row, forming m rows in total. Along the width direction Y of the module, n battery cells 10 are arranged in a row, forming n columns in total.

[0082] In the length direction X, excluding the gaps between the battery cells, the total length of the m battery cells 10 is m*a2, 95%≤m*a2 / a1≤98%. For example, m*a2 / a1=95%, 96%, 97%, 98%.

[0083] Specifically, when m*a2 / a1 is too small (for example, less than 95%), it means that there is a lot of blank space on the photovoltaic module, and the area of ​​the photovoltaic module cannot be fully utilized, which is not conducive to improving the efficiency of the photovoltaic module. When m*a2 / a1 is too large (for example, greater than 98%), it means that the cells are arranged too closely and there is a risk of parallel connection.

[0084] Optionally, in the width direction Y, a ratio of a sum of lengths b2 of the fourth sides 104 of n battery cells 10 in the plurality of battery cells 10 to a length b1 of the second side 102 is greater than 95% and less than 98%.

[0085] Specifically, in the width direction Y, excluding the gaps between the cells, the total length of the n cells 10 is n*b2, 95%≤n*b2 / b1≤98%. For example, n*b2 / b1=95%, 96%, 97%, 98%.

[0086] The specific disadvantages of n*b2 / b1 being too small or too large can be found in the above description of m*a2 / a1, which will not be repeated here for the sake of brevity.

[0087] The battery cells 10 are arranged according to the above-mentioned size relationship. The lower limit condition of the proportional relationship prevents the arrangement area of ​​the battery cells 10 from being too small, which can maximize the use of the space of the component to give full play to the photoelectric conversion performance of the battery cells 10 and ensure the power generation capacity of the component. In addition, by setting the upper limit of the proportional relationship, it is prevented that the battery cells 10 are too close to each other and cause the battery cells to be connected in parallel, which can improve the working stability of the photovoltaic component.

[0088] The photovoltaic module of the embodiment of the present application optimizes the length and area of ​​the module, and rationally plans the proportion of multiple cells in at least one direction of the length and width of the module, so that when installing this photovoltaic module on a building, it is not only convenient for construction personnel to install and carry, but also conducive to full assembly, and the photovoltaic module has a high utilization rate of the module area and has a high power generation. At the same time, it is also conducive to improving the working stability of the photovoltaic module. This photovoltaic module of the embodiment of the present application is suitable for promotion and use in buildings such as independent houses (such as roofs), has high practical value, and can produce good economic benefits.

[0089] Reference Figure 1 and Figure 2 The ratio of the sum of the lengths a2 of the third sides 103 of the m battery cells 10 in the plurality of battery cells 10 to the length a1 of the first side 101 is B1, and the ratio of the sum of the lengths b2 of the fourth sides 104 of the n battery cells 10 in the plurality of battery cells 10 to the length b1 of the second side 102 is B2.

[0090] Optionally, B1>B2. For example, assuming that a1=1762mm, b1=1134mm, a2=190 / 2mm, b2=182.2mm, m=18, n=6, then B1=(190 / 2*18) / 1762=0.97%, B2=(182.2*6) / 1134=0.964%.

[0091] Optionally, B1 < B2. For example, assume a1 = 1762 mm, b1 = 1134 mm, a2 = 188 / 2 mm, b2 = 182.2 mm, m = 18, n = 6. At this time, B1 = (188 / 2 * 18) / 1762 = 0.96%, B2 = (182.2 * 6) / 1134 = 0.964%.

[0092] Optionally, |B1 - B2| ≤ 0.8%.

[0093] This type of photovoltaic module means that the proportion of the cell in the length direction and the proportion in the width direction are relatively close, and the cells are laid on the photovoltaic module more evenly, which is beneficial to the uniform absorption of sunlight, thereby improving the photoelectric conversion efficiency.

[0094] Optionally, the product of the length a1 of the first side 101 and the length b1 of the second side 102 is more than 1.698 square meters.

[0095] Specifically, if the product of the length a1 of the first side 101 and the length b1 of the second side 102 is small, the corresponding area of the photovoltaic module is small, then the arrangement area of the cells on the photovoltaic module will be small, resulting in a low overall power of the photovoltaic module.

[0096] Therefore, the photovoltaic module in the embodiment of the present application requires that the product of the length a1 of the first side 101 and the length b1 of the second side 102 is more than 1.698 square meters, so that the photovoltaic module has a high power.

[0097] Optionally, referring to Figure 2 , the length a2 of the third side 103 is within the range of 94 ± 3 mm, and the length b2 of the fourth side 104 is within the range of 182.2 ± 5 mm.

[0098] Specifically, in each embodiment of the present application, the cell 10 can be a half-cell formed by cutting a complete rectangular cell with four chamfers. As Figure 2 shown, the length direction of the half-cell 10 in the embodiment of the present application is also the length direction of the whole cell before cutting, and the width direction of the half-cell 10 is also the width of the whole cell before cutting.

[0099] The length a2 of the half-cell 10 can be 91 mm, 92 mm, 93 mm, 94 mm, 95 mm, 96 mm, 97 mm. For example, when using a whole cell with a length of 188 mm to cut into a half-cell, the length of the cell 10 can be 94 mm.

[0100] Specifically, a battery cell that is too long (for example, greater than 97 mm) is not conducive to process manufacturing, and a battery cell that is too short (for example, less than 91 mm) will result in a lower power of the battery cell.

[0101] Based on the above, 91mm≤a2≤97mm can take into account both reducing process difficulty and ensuring component power.

[0102] The width b2 of the half-cell shaped battery cell 10 can be 177.2 mm, 178.2 mm, 179.2 mm, 180.2 mm, 182.2 mm, 185.2 mm, or 187.2 mm. For example, when a full-cell battery cell with a width of 182.2 mm is cut to obtain a half-cell battery cell, the width of the battery cell 10 remains unchanged at 182.2 mm.

[0103] Specifically, a battery cell width that is too large (for example, greater than 187.2 mm) is not conducive to process manufacturing, and a battery cell width that is too small (for example, less than 177.2 mm) will result in a lower power of the battery cell.

[0104] Based on the above, 177.2mm≤b2≤187.2mm can take into account both reducing process difficulty and ensuring component power.

[0105] Optionally, m=18, n=6, and the plurality of battery cells 10 are arranged along the length direction X and the width direction Y in a rectangular array of 18*6.

[0106] Specifically, when the area of ​​a PV module is fixed, a greater number of solar cells means that the solar cells are arranged more densely, which makes it easier for the risk of parallel connection to occur, resulting in instability of the PV module; a smaller number of solar cells means that more blank space is left in the PV module, which is not conducive to fully utilizing the module space.

[0107] Based on the above, the battery cell of the present application is 18*6, which can take into account the stability of the component and make full use of the component space.

[0108] Optionally, the mass of the photovoltaic assembly is greater than 21 kg and less than 26 kg.

[0109] Specifically, when the area of ​​a photovoltaic module is fixed, the smaller the mass of the photovoltaic module (for example, less than 21kg), the weaker the mechanical load capacity, the worse the wind resistance of the photovoltaic module, and the easier it is to be blown away by strong winds, etc. However, the larger the mass of the photovoltaic module (for example, greater than 26kg), the more difficult it is to install and transport the photovoltaic module. Furthermore, if the photovoltaic module is installed on the roof or wall of a building, if the mass of the photovoltaic module is too large, it is easy to cause safety problems such as falling or roof damage.

[0110] Therefore, the mass w of the photovoltaic module of the present application satisfies 21kg≤w≤26kg, which can take into account the mechanical load, wind resistance and ease of installation and transportation of the module, and at the same time, can reduce the probability of safety problems.

[0111] Optionally, the photovoltaic module is a single-glass module, and the mass w of the photovoltaic module is greater than 21 kg and less than 23 kg.

[0112] Specifically, the photovoltaic module of the embodiment of the present application can be a single-glass module. The single-glass module uses glass material only on the front, and its mass w is controlled between 21kg and 23kg, making the photovoltaic module more convenient to install. Furthermore, if it is installed on the roof or wall, the additional load it brings is smaller, which is conducive to reducing the safety issues of roof damage or photovoltaic module falling on the roof or wall.

[0113] Optionally, the photovoltaic module is a double-glass module, and the mass w of the photovoltaic module is greater than 23 kg and less than 26 kg.

[0114] Specifically, the photovoltaic module of the embodiment of the present application can also be a double-glass module, that is, glass material is used on both the front and back sides, and its mass w is controlled to be above 23kg and below 26kg, so that the mechanical load performance of the photovoltaic module is better and has a higher wind resistance.

[0115] Optionally, the output power P of the photovoltaic module is greater than 435W and less than 465W.

[0116] Specifically, in the photovoltaic module of the embodiment of the present application, the multiple cells 10 are arranged according to the proportion given in the above embodiment, and the output power of the photovoltaic module obtained is above 435W and below 465W, and this output power range can basically meet the needs of daily family life. For example, the output power can be 435W, 440W, 445W, 450W, 455W, 460W, 465W.

[0117] When the area of ​​the photovoltaic module is fixed, the smaller the power of the photovoltaic module, the less conducive it is to meeting the power supply demand of the module. The greater the power of the photovoltaic module, the denser the cells are, which is prone to the risk of parallel cells or parallel series. Based on the above, the output power P of the photovoltaic module of this application meets 435W≤P≤465W, and having a higher power is conducive to meeting the power supply demand, and is not prone to the risk of parallel cells or parallel series.

[0118] Optionally, a ratio of a length a1 of the first side 101 to a length b1 of the second side a2 is greater than 1.58 and less than 1.76.

[0119] Specifically, in one embodiment, when a1 / b1 is between 1.58 and 1.76, photovoltaic modules with such a length-to-width ratio are easier to be fully covered on a building and have better mechanical load performance.

[0120] Illustratively, a1 / b1 may be 1.58, 1.60, 1.62, 1.64, 1.65, 1.66, 1.68, 1.69, 1.70, 1.71, 1.73, 1.75, or 1.76. When the side length a1 of the first side 101 is 1797 mm and the side length b1 of the second side 102 is 1134 mm, a1 / b1 is 1.58; when the side length a1 of the first side 101 is 1798 mm and the side length b1 of the second side 102 is 1134 mm, a1 / b1 is 1.59; when the side length a1 of the first side 101 is 1799 mm and the side length b1 of the second side 102 is 1134 mm, a1 / b1 is 1.59; when the side length a1 of the first side 101 is 1800 mm and the side length b1 of the second side 102 is 1134 mm, a1 / b1 is 1.59; when the side length a1 of the first side 101 is 1994 mm and the side length b1 of the second side 102 is 1134 mm, a1 / b1 is 1.76.

[0121] Optionally, a ratio of a length b2 of the fourth side 104 to a length a2 of the third side 103 is greater than 1.91 and less than 1.97.

[0122] Specifically, in the battery cell 10 used in the embodiment of the present application, when b2 / a2 is between 1.91 and 1.97, it is also easier to achieve a larger proportion of the component surface by multiple battery cells 10. For example, b2 / a2 can be 1.91, 1.92, 1.93, 1.94, 1.95, 1.96, 1.97.

[0123] Optionally, the photovoltaic module further comprises a laminate and a frame located at the edge of the laminate, and the profile wall thickness of the frame is 1.2 mm to 1.5 mm.

[0124] Specifically, in the photovoltaic module of the embodiment of the present application, in order to ensure the overall rigidity of the module, the frame surrounding the photovoltaic laminate is also designed, and the profile wall thickness of the frame is 1.2mm to 1.5mm, which can be 1.2mm, 1.25mm, 1.3mm, 1.4mm, 1.45mm, 1.5mm. The profile wall thickness of the frame can be the thickness of the part parallel to the front of the module, the thickness of the part parallel to the back of the module, or the thickness of the side wall perpendicular to both the front and back of the module. The profile wall thickness of the frame within the above range can make the photovoltaic module have both structural mechanical strength and lightness.

[0125] Optionally, along the thickness direction of the laminate, the height of the frame is 30 mm. The height of the frame is also the height corresponding to the B surface of the frame.

[0126] Specifically, if the frame height is too high, the material cost will be higher, while if the frame height is too low, the installation will be inconvenient.

[0127] Based on the above, the frame height of the present application is 30 mm, which can take into account both frame cost and installation convenience.

[0128] Optionally, the frame of one side of the photovoltaic module is a frame without side A. The frame corresponding to the first side 101 or the second side 102 of the photovoltaic module is a frame without side A, that is, along the length or width direction of the module, the side A of the frame can be omitted, reducing dust accumulation and reducing the probability of hot spot phenomenon of the module.

[0129] Optionally, refer to Figures 1 to 3 , in the length direction X, the plurality of cells 10 are divided into two parts, the shortest distance between the edge of the first side 101 of the photovoltaic module and the edge of the cell 10 in the first part is d1, and the shortest distance between the edge of the same first side 101 of the photovoltaic module and the edge of the cell 10 in the second part is d2;

[0130] K<|d1-d2|<1 mm, where K is the width of the interconnection strip in the photovoltaic module.

[0131] Specifically, in the photovoltaic module of the embodiment of the present application, the plurality of cells 10 can be divided into two parts from the middle of the module along the length direction X of the module, one part is the first part, which can be defined as a first battery group, and the other part is the second part, which is defined as a second battery group. The number of cells 10 included in the first part and the second part can be equal.

[0132] Combination Figures 1 to 3 , the upper half of the module is the first part 10a, the lower half of the module is the second part 10b, the shortest distance between the edge of the first side 101 on the right side of the photovoltaic module and the edge of the battery cell 10 of the first part 10a is d1, and similarly on the right side, the shortest distance between the edge of the first side 101 and the edge of the battery cell 10 of the second part 10b is d2. d1 is the right creepage distance of the first part 10a, and d2 is the right creepage distance of the second part 10b.

[0133] In order to ensure the insulation performance of the assembly, d1 and d2 are not equal, and the absolute value of the difference between the two is greater than the width K of the interconnection bar that connects the battery cells 10 to form a battery string. Figure 3As shown in FIG. 1 , K<|d1-d2| can cause a certain misalignment between the interconnection strip extending from the first part 10a and the interconnection strip extending from the second part 10b, which helps to ensure that the two interconnection strips do not overlap. If the interconnection strips overlap and cause this area to become thicker, it is easy to cause hidden cracks in the glass during lamination.

[0134] Furthermore, if the interconnection bars overlap, the two interconnection bars and the middle bus bar need to be welded, which results in poor welding stability and is not conducive to efficient current transmission.

[0135] |d1-d2|<1mm prevents the battery cell 10 from forming a wide white edge with the edge of the component, thus preventing the waste of component area. When the width K of the interconnection strip is 0.5mm, 0.5mm<|d1-d2|<1mm, and |d1-d2| can be 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm. In one example, d1=13.8mm, d2=13mm, at this time, d1-d2=0.8mm can meet the above conditions.

[0136] Reference Figures 1 to 3 , in the length direction X, the plurality of cells 10 are divided into two parts, and the photovoltaic module further comprises a first busbar 30 respectively arranged at both ends of the photovoltaic module in the length direction X, and a second busbar 40 arranged in the gap between the two parts;

[0137] Optionally, a ratio of a width of the second bus strip 40 to a width of the first bus strip 30 is greater than 1.7 and less than 2.

[0138] Specifically, combined Figures 1 to 3 As shown in the figure, in the photovoltaic module of the embodiment of the present application, when the module is divided into the first part 10a and the second part 10b, a first bus bar 30 is arranged between the first part 10a located at the upper part and the second side 102 of the upper part, and another first bus bar 30 is arranged between the second part 10b located at the lower part and the second side 102 of the lower part. Both first bus bars 30 are parallel to the width direction Y of the module. The first bus bar 30 is also called the end bus bar, which collects the current of the first battery group and the second battery group at the upper and lower ends of the module respectively. In the gap between the first part 10a and the second part 10b, along the width direction Y of the module, a second bus bar 40 is arranged. The second bus bar 40 is also called the middle bus bar, which collects the current from the first battery group in the upper part and the second battery group in the lower part in the middle of the module.

[0139] In the embodiment of the present application, optionally, the width of the first busbar 30 is W1, and the width of the second busbar 40 is W2. 1.7≤W2 / W1≤2, W2 / W1 can be 1.7, 1.8, 1.83, 1.85, 1.9, 1.93, 1.95 or 2.0. Optionally, the width of W2 can be 6 mm, the width of W1 can be 3.5 mm, and W2 / W1=1.71.

[0140] The width of the busbar affects the busbar efficiency. Generally, the wider the busbar is, the better the busbar efficiency is, but it is not conducive to cost saving.

[0141] When W2 / W1 is small (for example, less than 1.7), it means that the second busbar 40 is narrow, which is not conducive to the second busbar 40 to collect part of the current of the first battery group and part of the current of the second battery group. This is because, for the first busbar 30, it only needs to collect part of the current of the first battery group or part of the current of the second battery group, but the second busbar 40 needs to collect part of the current of the first battery group and part of the current of the second battery group. If the second busbar 40 is narrow, it is not conducive to collecting the current of the two battery groups.

[0142] When W2 / W1 is larger (for example, greater than 2), it means that the second busbar 40 is wider. Although it can improve the busbar efficiency, it is not conducive to cost saving.

[0143] Based on this, 1.7≤W2 / W1≤2 can take into account both convergence efficiency and cost savings.

[0144] Optionally, refer to Figures 1 to 3 , a ratio of the shortest distance between the edge of the first bus ribbon 30 and the edge of the battery cell 10 to the shortest distance between the second bus ribbon 40 and the edge of the battery cell 10 is greater than 0.8 and less than 1.

[0145] Specifically, combined Figures 1 to 3 As shown in the figure, the shortest distance between the edge of the first busbar 30 and the edge of the corresponding part of the cell 10 is d3, which means the distance from the head cell of the photovoltaic module to the first busbar 30 at the head end of the module (referred to as the "head busbar distance"), or the distance from the tail cell to the first busbar 30 at the tail end of the module (referred to as the "tail busbar distance"). The shortest distance between the second busbar 40 and the edge of the cell 10 is d4, which means the distance from the middle cell to the second busbar 40 (referred to as the "middle busbar distance").

[0146] As for the distance from the battery cell to the busbar (referred to as "wire connection distance"), the smaller the wire connection distance, the more likely it is to cause welding problems. Taking the head wire connection distance as an example, if the head wire connection distance is too short, when welding the first busbar 30, the first busbar 30 may be welded to the adjacent battery cell due to machine precision problems. For another example, if the head wire connection distance is too short, when welding the interconnection strip to the first busbar 30, the soldering iron tip may touch the battery cell. Therefore, the wire connection distance cannot be too small. However, the wire connection distance cannot be too large. If the wire connection distance is too large, it will result in more blank space, resulting in a waste of space in the photovoltaic module.

[0147] Therefore, when designing the wire transfer distance, the range of the wire transfer distance should be set reasonably.

[0148] If d3 / d4 is small (for example, less than 0.8), it means that the head wire connection distance is narrow, which is not conducive to reliable welding. If d3 / d4 is large (for example, greater than 1), it means that the head wire connection distance is large, leaving more blank space, resulting in a waste of photovoltaic module space.

[0149] Based on this, 0.8≤d3 / d4≤1 can take into account both welding reliability and component space utilization.

[0150] For example, d3 / d4 may be 0.8, 0.85, 0.88, 0.9, 0.95, 0.98 or 1.0.

[0151] Optionally, refer to Figures 4 to 6 , in the length direction X, the plurality of solar cells 10 are divided into two parts, the photovoltaic module further comprises a back plate 50, the back plate 50 is provided with three outlet holes 501, the three outlet holes 101 are distributed in the gap between the two parts, and the three outlet holes 501 are arranged along the width direction Y;

[0152] Among the three wire outlet holes 501 , the shape of the wire outlet hole 501 located in the middle is different from the shape of the wire outlet holes 501 located on both sides.

[0153] Specifically, if Figures 4 to 6 As shown in the figure, the photovoltaic module can also include a back panel 50 arranged on the back side of the laminate, and the back panel 50 is provided with wire outlet holes 501 for the lead terminals to pass through, and the three wire outlet holes 501 are distributed in the gap area formed by the first part 10a and the second part 10b, and the three wire outlet holes 501 are arranged at intervals along the width direction Y of the module.

[0154] For these outlet holes 501, the shape of the outlet hole 501 in the middle position can be different from the shape of the outlet holes 501 on both sides. For example, the outlet hole 501 in the middle position can be an ellipse or a racetrack or other irregular shapes, and the outlet holes 501 on both sides can be a perfect circle.

[0155] Specifically, for photovoltaic modules, the mechanical loads in the middle and near the edge are different, and the mechanical loads corresponding to the outlet holes of different shapes are also different. Based on this, the outlet holes in the middle and the outlet holes on both sides have different shapes, which can be matched according to the load distribution of the module, which is beneficial to improve the stability of the module and prevent hidden cracks.

[0156] Furthermore, for photovoltaic modules, the deformation in the middle is the largest, that is, the mechanical load weak point is in the middle. Since the module is rectangular, the stress distribution of the elliptical hole is more uniform than that of the circular hole, that is, the mechanical load performance of the elliptical hole is better.

[0157] Based on this, the wire outlet hole in the middle is elliptical or quasi-elliptical, and the wire outlet holes on both sides are circular, which is beneficial to improve the stability of the component and prevent hidden cracks.

[0158] Optionally, refer to Figure 7 The wire outlet hole 501 located in the middle of the three wire outlet holes 501 has a long axis and a short axis that are perpendicular to each other, the long axis is parallel to the width direction Y of the photovoltaic component, and the short axis is parallel to the length direction X of the photovoltaic component.

[0159] Specifically, the long axis of the middle wire outlet hole is parallel to the width of the photovoltaic module, which can make the stress distribution of the middle wire outlet hole more uniform and the mechanical load better, thereby improving the stability of the module and preventing hidden cracks.

[0160] Optionally, refer to Figure 7 , the ratio of the length L1 of the major axis to the length L2 of the minor axis is less than 1.5. Specifically, in one embodiment, L1 / L2≤1.5, for example, L1 / L2 may be 1.5, 1.4, 1.3, 1.2, 1.1, or 1.0.

[0161] Specifically, in theory, the smaller the hole, the better the corresponding mechanical load performance, and the less likely it is to have hidden cracks. L2 must ensure that the lead terminal passes through smoothly, and L1 needs to be larger than L2 but not too large to prevent hidden cracks.

[0162] Therefore, the wire outlet holes of the photovoltaic module of the present application are beneficial to the stability of the photovoltaic module and reduce the probability of hidden cracks.

[0163] Optionally, the length L1 of the major axis is greater than 12 mm and less than 18 mm.

[0164] In one implementation, 12 mm ≤ L1 ≤ 18 mm, for example, L1 may be 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, or 18 mm.

[0165] Specifically, when L1 is too small, it is not easy for the lead terminal to pass through, and when L1 is too large, the mechanical load performance of the hole becomes low.

[0166] Based on the above, the long axis value range of the present application can take into account both the smooth passage of the lead terminal and the mechanical load performance of the hole.

[0167] Optionally, the length L2 of the short axis is greater than 10 mm and less than 14 mm.

[0168] In one embodiment, 10 mm ≤ L2 ≤ 14 mm, for example, L2 can be 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, or 14 mm.

[0169] Specifically, when L2 is too small, it is not easy for the lead terminal to pass through, and when L2 is too large, the mechanical load performance of the hole becomes low.

[0170] Based on the above, the long axis value range of the present application can take into account both the smooth passage of the lead terminal and the mechanical load performance of the hole.

[0171] Alternatively, in another example, Figure 7 As shown, the cross-sectional shape of the outlet hole 501 at the middle position can be a closed figure formed by connecting multiple arcs, specifically including a first arc 501a, a second arc 501b, a third arc 501c and a fourth arc 501d, the first arc 501a and the second arc 501b are symmetrical with respect to the minor axis and are in a circle, the third arc 501c and the fourth arc 501d are symmetrical with respect to the major axis and are in an ellipse. The discontinuous positions between the first arc 501a, the second arc 501b, the third arc 501c and the fourth arc 501d are smoothly connected by four arcs.

[0172] Specifically, the middle outlet hole includes multiple arcs. This opening shape has smooth features at all parts, which helps to improve the stability of the photovoltaic module and prevent hidden cracks. On the contrary, if it is not a smooth curve, such as a square opening, stress points will appear at the corners, which is prone to hidden cracks.

[0173] In addition, in another example, a chamfered structure may be processed at a position of the battery cell 10 close to the wire outlet hole 501 to avoid hidden cracks of the battery cell 10 .

[0174] Optionally, based on the above embodiment, in one implementation manner, the number of busbars provided on each battery cell 10 is greater than 16 and less than 20. The number of busbars may be 16, 17, 18, 19, or 20.

[0175] Specifically, the more main grids there are, the better the current collection performance is, but this will lead to increased costs.

[0176] Based on the above, the number of main grids in the embodiment of the present application can take into account both current collection performance and cost reduction. For example, the number of main grids can be 18.

[0177] Optionally, based on the above embodiment, in one implementation, a plurality of busbars are provided on each cell 10, and the number of pads provided on each busbar is greater than 6 and less than 9. The number of pads on the busbar may be 6, 7, 8, or 9.

[0178] Specifically, more pads on a single busbar make welding more reliable but will lead to increased costs.

[0179] Based on the above, the number of pads on the main grid of the present application can take into account both welding reliability and cost reduction.

[0180] Optionally, based on the above-mentioned embodiment, in one implementation manner, the number of positive electrode fine grids provided on each of the battery cells 10 is greater than 98 and less than 103. The number of positive electrode fine grids may be 98

[0181] Articles, 99, 100, 101, 102, and 103.

[0182] Optionally, based on the above embodiment, in one implementation, the number of negative electrode fine grids provided on each battery cell 10 is greater than 99 and less than 104. The number of negative electrode fine grids may be 99, 100, 101, 102, 103, or 104.

[0183] Specifically, the more fine grids there are, the better the current collection performance is, but the higher the cost is. And when the cell area is fixed, the more fine grids there are, the closer the distance between the opposite-sex fine grids is, and the more likely it is that a short circuit risk will occur.

[0184] Based on the above, the number of fine grids in the present application can take into account the current collection performance, the safe distance of the heterogeneous fine grids, and the reduction of costs.

[0185] Optionally, based on the above-mentioned embodiment, in one implementation manner, a plurality of fine grids are provided on each of the battery cells 10 , and the distance between two adjacent fine grids with the same polarity is greater than 0.92 mm and less than 0.96 mm.

[0186] When a plurality of fine grids are provided on the battery cell 10 , the distance between two adjacent fine grids of the same polarity is greater than or equal to 0.92 mm and less than or equal to 0.96 mm.

[0187] Specifically, for back-contact cells, since there is a thin grid of opposite polarity between two thin grids of the same polarity, the smaller the distance between two adjacent thin grids of the same polarity, the smaller the distance between the thin grids of opposite polarity, and the easier it is for them to contact and short-circuit. The larger the distance between two adjacent thin grids of the same polarity, the more unfavorable it is to fully utilize the component space.

[0188] Based on the above, the embodiments of the present application can take into account both circuit stability and component space utilization.

[0189] Optionally, the positive busbar and the negative busbar of the battery cell 10 in the embodiment of the present application are arranged on the back side of the battery cell.

[0190] Specifically, the battery cell 10 of the present application can be a battery cell without a busbar or a battery cell with a busbar.

[0191] Taking a battery cell with a main grid as an example, the battery cell 10 of the embodiment of the present application can be a back-contact battery in which the positive main grid, the negative main grid, the positive fine grid, and the negative fine grid are all distributed on the backlight surface of the battery cell.

[0192] Specifically, the cells on the photovoltaic module of the embodiment of the present application are back-contact cells. Since the back-contact cells have no obstruction on the front side, they have a higher conversion efficiency, so that the photovoltaic module has a higher power.

[0193] Optionally, refer to Figure 1 and Figure 2 , the plurality of battery cells 10 form a plurality of battery strings;

[0194] The string spacing δ1 between two adjacent battery strings along the width direction Y is greater than 0.8 mm and less than 2 mm. The string spacing δ1 may be 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2.0 mm.

[0195] When the string spacing δ1 is large, it is easy to cause a waste of component area, and when the string spacing δ1 is small, it is easy to cause the battery strings on the component to be connected in parallel, which is easy to cause circuit failure.

[0196] Based on this, the string spacing δ1 of the embodiment of the present application satisfies 0.8mm≤δ1≤2mm, which can not only reduce the risk of battery string and parallel connection, but also make full use of the component space.

[0197] Optionally, refer to Figure 1 and Figure 2, along the length direction X, the cell spacing δ2 between two adjacent cells in the same cell string is greater than 0.5 mm and less than 2 mm. The cell spacing δ2 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm.

[0198] When the cell spacing δ2 is large, it is easy to cause a waste of component area, and when the cell spacing δ2 is small, it is easy to cause parallel cells inside the battery string on the component, which is easy to cause circuit failure.

[0199] Based on this, the cell spacing in this application is 0.5mm≤δ2≤2mm, which can not only reduce the risk of cell paralleling, but also make full use of the component space.

[0200] Optionally, refer to Figure 1 and Figure 2 The string spacing δ1 between two adjacent battery strings is greater than the cell spacing δ2 between two adjacent battery cells 10 in the same battery string.

[0201] Specifically, compared to battery cells, battery strings are longer and will bend to a certain extent after being welded with interconnecting strips, so the risk of parallel connection is higher. Therefore, a reasonable design is that the string spacing between battery strings should be larger than the cell spacing between battery cells.

[0202] Based on the above, the string spacing δ1 of the battery string is greater than the cell spacing δ2 between two adjacent battery cells 10 in the same battery string. The photovoltaic module has a higher module space utilization rate and is safer and more reliable.

[0203] Optionally, the photovoltaic assembly further comprises a bus bar connecting the battery strings and an interconnection bar connecting two battery cells, and the interconnection bar is a flat interconnection bar.

[0204] Specifically, in one embodiment, the interconnection bar may be a flat interconnection bar with a rectangular cross-section, having a relatively large welding surface, and can be reliably welded to the pad on the battery cell 10 .

[0205] Optionally, the width of the interconnection strip is greater than 0.4 mm and less than 1 mm. For example, the width of the interconnection strip may be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm.

[0206] Based on the above, the width of the interconnection strips in the embodiment of the present application is conducive to reducing the current transmission resistance and improving the welding reliability.

[0207] Optionally, the overlap length between the interconnection bar and the bus bar is greater than 2.8 mm and less than 3.5 mm. The overlap length may be 2.8 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, or 3.5 mm.

[0208] When the overlap length is too short, it is easy to cause poor welding contact between the interconnection bar and the bus bar. When the overlap length is too long, it leads to increased waste of interconnection bars. The above overlap length range can ensure welding reliability and avoid waste of interconnection bars.

[0209] The embodiments of the present application also provide a photovoltaic system, which may use multiple photovoltaic modules as described in the aforementioned embodiments. Multiple photovoltaic modules may be installed on the roof of a building to form a distributed photovoltaic power generation system.

[0210] Specifically, the photovoltaic modules can be fixed to the building by using adhesive with strong adhesion and excellent weather resistance, or by using connectors such as a pressing block assembly used in conjunction with the photovoltaic module frame, or by using a hanger fastener used in conjunction with the photovoltaic module frame to mount the photovoltaic module on the wall of the building. The appropriate installation structure can be selected according to the actual construction conditions.

[0211] Based on the above, it can be seen that the photovoltaic system can take into account conversion efficiency, cost, building matching and stability and reliability.

[0212] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0213] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A photovoltaic module, characterized in that: Comprising: It has two first sides arranged along the length direction of the photovoltaic module, and two second sides arranged along the width direction of the photovoltaic module. The length of the first side is above 1759 mm and below 1765 mm, and the product of the length of the first side and the length of the second side does not exceed 1.998 square meters. The photovoltaic module includes multiple battery cells. The battery cells have a third side arranged along the length direction and a fourth side arranged along the width direction. The multiple battery cells are arranged in an m*n rectangular array along the length direction and the width direction. In the length direction, the ratio of the sum of the lengths of the third sides of m of the multiple battery cells to the length of the first side is above 95% and below 98%; and / or, In the width direction, the ratio of the sum of the lengths of the fourth sides of n of the multiple battery cells to the length of the second side is above 95% and below 98%.

2. The photovoltaic module according to claim 1, characterized in that: The ratio of the sum of the lengths of the third sides of m of the multiple battery cells to the length of the first side is B1, and the ratio of the sum of the lengths of the fourth sides of n of the multiple battery cells to the length of the second side is B2. B1 > B2; or, B1 < B2; or, |B1 - B2| ≤ 0.8%.

3. The photovoltaic module according to claim 1 or 2, characterized in that: The product of the length of the first side and the length of the second side is above 1.698 square meters; and / or, The length of the third side is within the range of 94 mm ± 3 mm, and the length of the fourth side is within the range of 182.2 mm ± 5 mm; and / or, m = 18, n = 6, and the multiple battery cells are arranged in an 18*6 rectangular array along the length direction and the width direction.

4. The photovoltaic module according to claim 1 or 2, characterized in that: The mass of the photovoltaic module is above 21 kg and below 26 kg; and / or, The output power of the photovoltaic module is above 435 W and below 465 W.

5. The photovoltaic module according to claim 4, characterized in that: The photovoltaic module is a single-glass module, and the mass of the photovoltaic module is above 21 kg and below 23 kg; or, The photovoltaic module is a double-glass module, and the mass of the photovoltaic module is above 23 kg and below 26 kg.

6. The photovoltaic module according to claim 1 or 2, characterized in that: The ratio of the length of the first side to the length of the second side is above 1.58 and below 1.76; and / or, The ratio of the length of the fourth side to the length of the third side is above 1.91 and below 1.

97.

7. The photovoltaic module according to claim 1 or 2, characterized in that: The photovoltaic module includes a laminate and a frame located at the edge of the laminate. The wall thickness of the profile of the frame is 1.2 mm to 1.5 mm; and / or, Along the thickness direction of the laminate, the height of the frame is 30 mm; and / or, One side frame of the photovoltaic module is a frame without A surface.

8. The photovoltaic module according to claim 1 or 2, characterized in that: In the length direction, the multiple battery cells are divided into two parts. The shortest distance between the edge of the first side of the photovoltaic module and the edge of the battery cells in the first part is d1, and the shortest distance between the edge of the same first side of the photovoltaic module and the edge of the battery cells in the second part is d2. K < |d1 - d2| < 1, where K is the width of the interconnection bar in the photovoltaic module.

9. The photovoltaic module according to claim 1 or 2, characterized in that: In the length direction, the plurality of solar cells are divided into two parts, and the photovoltaic assembly further comprises a first busbar disposed at both ends of the photovoltaic assembly in the length direction, and a second busbar disposed in the gap between the two parts; Wherein, the ratio of the width of the second busbar to the width of the first busbar is greater than 1.7 and less than 2; and / or, A ratio of the shortest distance between the edge of the first busbar and the edge of the battery cell to the shortest distance between the second busbar and the edge of the battery cell is greater than 0.8 and less than 1.

10. The photovoltaic module according to claim 1 or 2, characterized in that: In the length direction, the plurality of solar cells are divided into two parts, the photovoltaic module further comprises a back plate, the back plate is provided with three outlet holes, the three outlet holes are distributed in the gap between the two parts, and the three outlet holes are arranged along the width direction; Among them, the shape of the outlet hole located in the middle of the three outlet holes and the outlet holes located on both sides are different. The wire holes have different shapes; and / or, The shape of the outlet hole located in the middle of the three outlet holes is elliptical or quasi-elliptical, and the shapes of the outlet holes located on both sides are circular; and / or, The outlet hole located in the middle of the three outlet holes has a long axis and a short axis that are perpendicular to each other, the long axis is parallel to the width direction of the photovoltaic module, and the short axis is parallel to the length direction of the photovoltaic module; the cross-sectional shape of the outlet hole located in the middle of the three outlet holes includes a first arc, a second arc, a third arc and a fourth arc, the first arc and the second arc are symmetrical with respect to the short axis and are cocircular, and the third arc and the fourth arc are symmetrical with respect to the long axis and are coelliptical; and / or, The battery sheet has a chamfered structure at a position close to the wire outlet hole.

11. The photovoltaic module according to claim 1 or 2, characterized in that: The number of main grids provided on each of the solar cells is greater than 16 and less than 20; and / or, Each of the solar cells is provided with a plurality of main grids, and the number of the welding pads provided on each main grid is greater than 6 and less than 9; and / or, The number of positive electrode fine grids provided on each of the battery cells is greater than 98 and less than 103; and / or, The number of negative electrode fine grids provided on each of the battery cells is greater than 99 and less than 104; and / or, A plurality of fine grids are arranged on each of the battery cells, and the distance between two adjacent fine grids with the same polarity is greater than 0.92 mm and less than 0.96 mm; and / or, The positive main grid and the negative main grid of the battery cell are arranged on the back side of the battery cell.

12. The photovoltaic module according to claim 1 or 2, characterized in that: The plurality of battery cells form a plurality of battery strings; Along the width direction, the string spacing between two adjacent battery strings is greater than 0.8 mm and less than 2 mm; and / or, Along the length direction, the spacing between two adjacent battery cells in the same battery string is greater than 0.5 mm and less than 2 mm; and / or, The string spacing between two adjacent battery strings is greater than the cell spacing between two adjacent battery cells in the same battery string.

13. The photovoltaic module according to claim 1 or 2, characterized in that: The photovoltaic module also includes a bus bar connecting the battery strings and an interconnect bar connecting two battery sheets; The interconnection strip is a flat interconnection strip; and / or, The width of the interconnection strip is greater than 0.4 mm and less than 1 mm; and / or, The overlapping length of the interconnection bar and the bus bar is greater than 2.8 mm and less than 3.5 mm.

14. A photovoltaic system, characterized in that: A plurality of photovoltaic modules according to any one of claims 1 to 13 arranged in an array.

15. The photovoltaic system according to claim 14, characterized in that: The photovoltaic module is glued to the building; or, The photovoltaic module is fixed to the building via a connector; or, The photovoltaic components are mounted on the building.

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