Laminated piece and photovoltaic module

Abstract

The utility model provides a laminated member and a photovoltaic assembly. The laminated piece comprises a cover plate, a first adhesive film, a battery piece, a second adhesive film and a back plate; the first adhesive film is arranged between the battery piece and the cover plate, and the second adhesive film is arranged between the battery piece and the back plate; the cover plate is arranged on the first surface of the battery piece, the back plate is arranged on the second surface of the battery piece, the cover plate is one of a chemical tempered glass plate and a physical tempered glass plate, and the back plate is the other one of the chemical tempered glass plate and the physical tempered glass plate; the thickness of the cover plate is t1, the thickness of the back plate is t2, and t1-t2 is larger than or equal to 0.2 mm and smaller than or equal to 2.5 mm. Therefore, the tempered glass with relatively high thermal shock resistance is protected by sacrificing the tempered glass with relatively low thermal shock resistance, and when the tempered glass with relatively low thermal shock resistance is integrally broken to release pressure, the heat-resistant and fireproof performance of the assembly is improved in an active pressure release manner, so that the whole assembly is prevented from being burnt through by flame, and the service life of the assembly is prolonged. And safety accidents are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially relates to a kind of laminated parts and photovoltaic module. BACKGROUND

[0002] Solar photovoltaic system is converted into electric energy using photovoltaic cell solar energy, its principle is when solar irradiation is on cell silicon chip, photon excitation electron in silicon chip, generates current, current is handled after inverter, can supply family and commercial electric equipment.Photovoltaic module may encounter wire aging, inverter failure, external spark, lightning or static electricity and other problems during installation and use process and lead to local overheating, even cause fire.

[0003] Single glass module is combustible due to backside benefit board material, and its heat resistance and fireproof performance is poor.And double glass module has better fireproof performance due to the existence of physical toughened glass protection on front and back.But when external high-temperature flame exists, the stress state of physical toughened glass itself is unbalanced and easy to deform, the glue film in module is easy to decompose and produce gas under heat radiation, high pressure is generated inside module, extrusion between frame and glass is easy to occur and make glass breakage, flame is easy to invade into module interior and cause burning.Meanwhile, under high-temperature condition, gas is produced by decomposition of internal glue film, local high pressure is caused, pressure exceeds the resistance strength of glass, and glass is cracked and produces hole.Conventional double glass module can pass Class C fireproof level test of UL790 standard, but cannot pass Class A or higher level combustion fast fireproof test.

[0004] Therefore, the heat resistance and fireproof performance of conventional double glass module is poor, and there is high fire failure risk and safety hazard. INVENTION CONTENTS

[0005] The utility model embodiment provides a kind of laminated parts and photovoltaic module, can solve the heat resistance and fireproof performance of current photovoltaic module is poor Problem.

[0006] The utility model provides a kind of laminated parts, including cover plate, first glue film, cell piece, second glue film and backboard;

[0007] The first glue film is arranged between the cell piece and the cover plate, and the second glue film is arranged between the cell piece and the backboard;

[0008] The cover plate is arranged on the first surface of the cell piece, and the backboard is arranged on the second surface of the cell piece, wherein the cover plate is one of a chemically tempered glass plate and a physically tempered glass plate, and the backboard is the other one of a chemically tempered glass plate and a physically tempered glass plate;

[0009] The thickness of the cover plate is t1, and the thickness of the backboard is t2, and 0.2mm≤|t1-t2|≤2.5mm.

[0010] Optionally, 0.2mm≤| t1- t2|≤1mm.

[0011] Optionally, 2mm≤ t1≤3.2mm, 1.1mm≤ t2≤1.6mm.

[0012] Optionally, 1.1mm≤ t1≤1.6mm, 2mm≤ t2≤3.2mm.

[0013] Optionally, the cover plate is physical toughened glass, and the back plate is chemical toughened glass.

[0014] Optionally, 2mm≤ t1≤3mm, 1.4mm≤ t2≤1.6mm.

[0015] Optionally, the first adhesive film has a gram weight of g1, 250g / m 2 ≤ g1≤520g / m 2 , and / or the second adhesive film has a gram weight of g2, 250g / m 2 ≤ g2≤520g / m 2 .

[0016] Optionally, 290g / m 2 ≤ g1≤310g / m 2 .

[0017] Optionally, 440g / m 2 ≤ g2≤460g / m 2 .

[0018] The utility model also provides a kind of photovoltaic module, including frame and any one described above laminated piece;

[0019] The laminated piece is fixed in the frame.

[0020] Optionally, the distance between the laminated piece edge and the frame along the length or width direction of the photovoltaic module is a, 5.5mm≤a≤7mm.

[0021] Optionally, the frame is a composite material frame containing glass fiber, wherein 5.5mm≤a≤6.5mm.

[0022] The utility model discloses a laminated piece, the cover plate is arranged at the first surface of the battery piece, and the backboard is arranged at the second surface of the battery piece. The first adhesive film is arranged between the battery piece and the cover plate, and the second adhesive film is arranged between the battery piece and the backboard. The cover plate and the backboard adopt tempered glass with different heat shock resistance, including chemical tempered glass and physical tempered glass. The chemical tempered glass is manufactured by low-temperature ion exchange process. After ion exchange, the volume changes, and the compressive stress is formed on the surface of the glass, and the tensile stress is formed inside. When the glass bears external force, the surface stress is first offset. When the surface stress changes rapidly under high temperature, only the small area of the glass will break, and the whole glass will not burst. Even if the glass is partially broken, the overall structure of the assembly can still remain intact. The physical tempered glass has poor heat shock resistance under high temperature. When the external high-temperature flame exceeds the tempering temperature of the physical tempered glass, the stress state of the glass will be unbalanced and the glass will be broken, and the high pressure in the assembly will be released. When the cover plate is made of chemical tempered glass, the backboard is made of physical tempered glass. When the cover plate is made of physical tempered glass, the backboard is made of chemical tempered glass. In addition, the heat shock resistance of tempered glass of different thicknesses is different. By designing the thickness difference between the cover plate and the backboard, the difference in heat shock resistance of the cover plate and the backboard is strengthened. The thicker tempered glass has stronger heat shock resistance. Therefore, the utility model protects the tempered glass with strong heat shock resistance by sacrificing the tempered glass with weak heat shock resistance. When the tempered glass with weak heat shock resistance is broken, the pressure is released, and the heat resistance and fireproof performance of the assembly are improved by active pressure relief, ensuring that the assembly is not burned by the flame and avoiding safety accidents. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or related technologies, the drawings needed to be used in the embodiment or related technology description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating labor.

[0024] Figure 1 The laminated piece structure schematic diagram provided by the utility model embodiment is shown.

[0025] Figure 2 The photovoltaic module structure schematic diagram in the utility model embodiment is shown.

[0026] Mark explanation:

[0027] 1-laminated piece, 11-cover plate, 12-first adhesive film, 13-battery piece, 14-second adhesive film, 15-backboard, 2-frame, 21-fixing groove. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0029] In related technologies, to improve the heat resistance and fireproof performance of photovoltaic modules, methods include increasing the thickness of the cover and backsheet glass, using flame-retardant films for encapsulation, or installing steel plates or flame-retardant materials such as polyvinyl chloride (PVC) on the back of the module. However, increasing glass thickness is problematic because tempered glass itself is prone to stress imbalance at high temperatures, leading to weakened strength. Under the combined effects of external high temperature and internal high pressure, it is highly susceptible to failure and overall breakage. Furthermore, increased glass thickness increases the overall weight and material cost of the module, resulting in poor economic efficiency. Flame-retardant films are more expensive than conventional films, and the resulting modules also pose reliability risks. Installing steel plates or flame-retardant materials such as PVC on the back of the module increases installation and maintenance costs, and also carries reliability risks. Therefore, there is an urgent need for an improved solution that can effectively reduce module manufacturing costs while ensuring heat resistance and fireproof performance and avoiding reliability risks.

[0030] The laminate and photovoltaic module provided by the present invention will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0031] Reference Figure 1 This utility model embodiment provides a laminate 1, including a cover plate 11, a first adhesive film 12, a battery cell 13, a second adhesive film 14, and a back plate 15; the first adhesive film 12 is disposed between the battery cell 13 and the cover plate 11, and the second adhesive film 14 is disposed between the battery cell 13 and the back plate 15; the cover plate 11 is disposed on the first surface of the battery cell 13, and the back plate 15 is disposed on the second surface of the battery cell 13; the cover plate 11 is one of a chemically tempered glass plate and a physically tempered glass plate, and the back plate 15 is the other of a chemically tempered glass plate and a physically tempered glass plate; the thickness of the cover plate 11 is t1, the thickness of the back plate 15 is t2, and 0.2mm≤|t1-t2|≤2.5mm.

[0032] Specifically, such as Figure 1As shown, the laminate 1 is the core component of the photovoltaic module, and the laminate 1 includes the cell sheet 13, the cover plate 11, the first adhesive film 12, the second adhesive film 14, and the back plate 15. The cell sheet 13 includes a plurality of cell strings, each of which is formed by a plurality of cell sheets connected in series, and the plurality of cell strings are electrically connected by the busbar to output current. The cover plate 11 is bonded to the first surface, i.e., the upper surface, of the cell sheet 13, and the back plate 15 is bonded to the second surface, i.e., the lower surface, of the cell sheet 13. Therefore, the cover plate 11 is located on the light-receiving surface of the laminate, also known as the front plate, and the back plate 15 is located on the back surface of the laminate, also known as the back plate. The first adhesive film 12, also known as the upper adhesive film, is arranged between the upper surface of the cell sheet 13 and the lower surface of the cover plate 11, has certain light transmission and adhesion, and the cell sheet 13 is bonded to the cover plate 11 through the first adhesive film 12. The second adhesive film 14, also known as the lower adhesive film, is arranged between the lower surface of the cell sheet 13 and the upper surface of the back plate 15, has certain light transmission and adhesion, and the cell sheet 13 is bonded to the back plate 15 through the second adhesive film 14. That is, through the first adhesive film 12 and the second adhesive film 14, the reliability of the bonding between the cover plate 11 and the back plate 15 and the cell sheet 13 is improved. The first adhesive film 12 and the second adhesive film 14 can be made of EVA (Ethylene Vinyl Acetate Copolymer), POE (polyoxyethylene), or EPE (Expandable Polyethylene). For example, the first adhesive film 12 and the second adhesive film 14 of the present embodiment are made of POE material, which has excellent aging resistance, low water vapor transmission rate, compression resistance, and heat resistance.

[0033] The cover plate 11 and the back plate 15 are made of tempered glass with different heat shock resistance, including chemical tempered glass and physical tempered glass. The manufacturing process of the chemical tempered glass is to place the glass in molten alkali salt, exchange ions in the surface layer of the glass with ions in the molten salt, and form compressive stress on the surface of the glass and tensile stress inside due to the volume change after ion exchange. When the surface stress changes under the condition of rapid high temperature, only the small area where the change occurs will be damaged, and the whole glass will not burst. Even if the glass is locally broken, the overall structure of the assembly can still remain intact, preventing thermal burst and having strong heat shock resistance. The physical tempered glass, also known as quenching tempered glass, is manufactured by heating the glass to a certain temperature and then quickly immersing it in cold water to cool it. When the external high-temperature flame exceeds the tempering temperature of the physical tempered glass, the stress state of the glass will be unbalanced and fail, causing the whole glass to break. The physical tempered glass has weak heat shock resistance, but it can release the high pressure gas inside the assembly under high temperature conditions. In some embodiments, when the cover plate 11 is made of chemical tempered glass, the back plate 15 is made of physical tempered glass; when the cover plate 11 is made of physical tempered glass, the back plate 15 is made of chemical tempered glass. That is, two kinds of tempered glass with different fireproof and heat-resistant properties are used under high temperature conditions. By sacrificing the physical tempered glass with poor fireproof and heat-resistant performance, the high pressure gas generated inside the assembly under high temperature conditions is released, and the fireproof and heat-resistant performance of the assembly is improved in the form of active pressure relief, ensuring the integrity of the overall structure of the assembly.

[0034] In addition, the thickness of the cover plate 11 is t1, the thickness of the back plate 15 is t2, and the cover plate 11 and the back plate 15 have a thickness difference. The heat shock resistance of tempered glass with different thicknesses is different. The thicker the glass, the better the heat shock resistance. In this embodiment, the thickness difference between the cover plate 11 and the back plate 15 is 0.2mm≤|t1-t2|≤2.5mm. In the manufacturing process, the thickness of the physical tempered glass is usually greater than that of the chemical tempered glass, which can also compensate for the weakness of the physical tempered glass in heat shock resistance. When the cover plate 11 is made of chemical tempered glass and the back plate 15 is made of physical tempered glass, t1

[0035] In summary, the cover plate and the back plate of the laminated component adopt tempered glass with different heat shock resistance, and different glass thickness differences are designed, the tempered glass with weak heat shock resistance is sacrificed to protect the tempered glass with strong heat shock resistance, when the tempered glass with weak heat shock resistance is broken as a whole to release pressure, the heat resistance and fireproof performance of the component are improved in the form of active pressure relief, the whole component is ensured not to be burned by the flame, and the safety accident is avoided. In addition, the manufacturing and operation and maintenance costs of the component are not additionally increased, and the reliability risk is avoided.

[0036] In optional embodiments, the thickness difference | t1- t2| between the cover plate 11 and the back plate 15 satisfies: 0.2mm≤| t1-t2|≤1mm.

[0037] Specifically, on the basis of the above-mentioned embodiments, the thickness difference between the cover plate 11 and the back plate 15 satisfies: 0.2mm≤| t1- t2|≤1mm, in some embodiments, the thickness difference | t1- t2| between the cover plate 11 and the back plate 15 can be 0.2mm, 0.4mm, 0.6mm, 0.7mm, 0.8mm or 1.0mm. When the cover plate 11 adopts chemical tempered glass and the back plate 15 adopts physical tempered glass, 0.2mm≤t2-t1≤1mm; when the cover plate 11 adopts physical tempered glass and the back plate 15 adopts chemical tempered glass, 0.2mm≤t1-t2≤1mm.

[0038] In optional embodiments, 2mm≤ t1≤3.2mm, 1.1mm≤ t2≤1.6mm.

[0039] Specifically, in the case that the cover plate 11 adopts physical tempered glass and the back plate 15 adopts chemical tempered glass, 2mm≤ t1≤3.2mm, 1.1mm≤ t2≤1.6mm. When t1 is less than 2mm, or t2 is less than 1.1mm, the heat shock resistance of the tempered glass cannot be guaranteed; when t1 is greater than 3.2mm, or t2 is greater than 1.6mm, the thickness of the tempered glass is large, the weight and material cost of the component are large, and the requirements of light weight and economy are not met. In some embodiments, t1 can be 2mm, 2.2mm, 2.4mm, 2.6mm, 3.0mm or 3.2mm. t2 can be 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm or 1.6mm.

[0040] Specifically, in some embodiments, t1 is 2 mm and t2 is 1.6 mm; t1 is 2 mm and t2 is 1.5 mm; t1 is 2 mm and t2 is 1.4 mm; t1 is 3 mm and t2 is 1.6 mm; t1 is 3 mm and t2 is 1.5 mm; t1 is 3 mm and t2 is 1.4 mm; t1 is 3.2 mm and t2 is 1.1 mm; t1 is 3.2 mm and t2 is 1.2 mm; t1 is 3.2 mm and t2 is 1.3 mm; t1 is 3.2 mm and t2 is 1.4 mm; t1 is 3.2 mm and t2 is 1.6 mm.

[0041] In optional embodiments, 1.1 mm≤ t1≤ 1.6 mm and 2 mm≤ t2≤ 3.2 mm.

[0042] Specifically, in the case that the cover plate 11 is made of chemically tempered glass and the back plate 15 is made of physically tempered glass, 1.1 mm≤ t1≤ 1.6 mm and 2 mm≤ t2≤ 3.2 mm. When t1 is less than 1.1 mm or t2 is less than 2 mm, the thermal shock resistance of the tempered glass cannot be guaranteed; when t1 is greater than 1.6 mm or t2 is greater than 2 mm, the thickness of the tempered glass is large, the weight and material cost of the assembly are large, and the requirements of light weight and economy cannot be met. In some embodiments, t1 can be 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm or 1.6 mm. t2 can be 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 3.0 mm or 3.2 mm.

[0043] Specifically, in some embodiments, t2 is 2 mm and t1 is 1.6 mm; t2 is 2 mm and t1 is 1.5 mm; t2 is 2 mm and t1 is 1.4 mm; t2 is 3 mm and t1 is 1.6 mm; t2 is 3 mm and t1 is 1.5 mm; t2 is 3 mm and t1 is 1.4 mm; t2 is 3.2 mm and t1 is 1.1 mm; t2 is 3.2 mm and t1 is 1.2 mm; t2 is 3.2 mm and t1 is 1.3 mm; t2 is 3.2 mm and t1 is 1.4 mm; t2 is 3.2 mm and t1 is 1.6 mm.

[0044] In optional embodiments, referring to Figure 1 , the cover plate 11 is physically tempered glass and the back plate 15 is chemically tempered glass.

[0045] On the basis of the above embodiments, 2 mm≤ t1≤ 3 mm and 1.4 mm≤ t2≤ 1.6 mm.

[0046] Specifically, when the photovoltaic module is applied to a building roof, the backplane 15 is located on the back of the laminate and bears the load of the laminate, and is connected with the building roof, while the cover plate 11 directly collides with the external ice and snow and hail. Therefore, in the embodiment, the backplane 15 is made of chemically tempered glass, which can maintain the integrity of the overall structure of the module even if the glass is partially broken when subjected to external high-temperature impact, thereby reducing damage to the building roof and reducing the risk of accidents. At the same time, the stress impact performance is improved by physically tempering the glass. Therefore, the cover plate 11 is made of physically tempered glass.

[0047] Specifically, 2mm≤ t1≤3mm, 1.4mm≤ t2≤1.6mm. t1 can be 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm or 3.0mm, and t2 can be 1.4mm, 1.5mm or 1.6mm. In order to improve the anti-hail impact ability and mechanical properties of the photovoltaic module, the thickness of the cover plate 11 needs to be increased. In addition to 3.0mm of physically tempered glass, the cover plate 11 can also use 3.2mm of physically tempered glass.

[0048] In an optional embodiment, the first adhesive film 12 has a grammage g1 of 250g / m 2 ≤ g1≤520g / m 2 , and / or the second adhesive film 14 has a grammage g2 of 250g / m 2 ≤g2≤520g / m 2 .

[0049] Specifically, the grammage g1 of the first adhesive film 12 and the grammage g2 of the second adhesive film 14 reflect the weight per unit area of the first adhesive film 12 and the second adhesive film 14. In the embodiment, 250g / m 2 ≤ g1g2≤520g / m 2 , and / or 250g / m 2 ≤g2≤520g / m 2 When the grammage g1 of the first adhesive film 12 and the grammage g2 of the second adhesive film 14 are less than 250g / m 2 , the reliability and impact resistance of the module cannot be ensured, and the photoelectric conversion efficiency of the module is reduced. When the grammage g1 of the first adhesive film 12 and the grammage g2 of the second adhesive film 14 are greater than 520g / m 2 , when the external temperature of the module is too high, the adhesive film will decompose to produce more gas to cause high pressure inside the module, causing the tempered glass to break. At the same time, when the grammage of the adhesive film is large, the manufacturing cost is high, and the weight of the module is large, which does not meet the requirements of economy and light weight.

[0050] In an optional embodiment, the grammage g1 of the first adhesive film 12 satisfies: 290g / m 2≤ g1≤ 310 g / m 2 .

[0051] Specifically, on the basis of the above embodiments, taking into account the reliability of the photovoltaic module and the manufacturing cost, the gram weight g1 of the first adhesive film 12 is preferably 300 g / m 2 In some preferred embodiments, considering the error of the manufacturing process, the gram weight g1 of the first adhesive film 12 satisfies: 290 g / m 2 ≤ g1≤ 310 g / m 2 . For example, the gram weight g1 of the first adhesive film 12 can be 290 g / m 2 , 295 g / m 2 , 300 g / m 2 , 305 g / m 2 , 308 g / m 2 or 310 g / m 2 .

[0052] In some optional embodiments, the gram weight g2 of the second adhesive film 14 satisfies: 440 g / m 2 ≤ g2≤ 460 g / m 2 .

[0053] Specifically, since the second adhesive film 14 is closer to the lower part of the photovoltaic module, it is used to bear more load of the module, so the gram weight g2 of the second adhesive film 14 needs to be greater than the gram weight g1 of the first adhesive film 12. On the basis of the above embodiments, taking into account the reliability of the photovoltaic module and the manufacturing cost, the gram weight g2 of the second adhesive film 14 is preferably 450 g / m 2 In some preferred embodiments, considering the error of the manufacturing process, the gram weight g1 of the first adhesive film 12 satisfies: 440 g / m 2 ≤ g1≤ 460 g / m 2 . For example, the gram weight g1 of the first adhesive film 12 can be 440 g / m 2 , 445 g / m 2 , 450 g / m 2 , 455 g / m 2 , 458 g / m 2 or 460 g / m 2 .

[0054] In some optional embodiments, referring to Figure 1 , the cell 13 includes a plurality of series-connected cells, and the thickness of a single cell is t3, 70 μm≤ t3≤ 180 μm.

[0055] Specifically, the form of multiple battery pieces connected in series is suitable for high-voltage demand application scenarios, can effectively reduce component loss, and improve output power, but the fault tolerance rate is low. The form of multiple battery pieces connected in parallel is suitable for low-voltage high-current application scenarios, and has a high fault tolerance rate, but the use cost is high. As shown in Figure 1 In the embodiment, the battery piece 13 adopts multiple single-crystal silicon battery pieces connected in series, each single-crystal silicon battery piece is connected in series by tin-copper band welding, and the current passes through each single-crystal silicon battery piece in turn. The thickness of a single battery piece is t3, 70 μm≤t3≤180 μm. When the thickness t3 of a single battery piece is greater than 180 μm, the manufacturing cost of the battery piece and the weight of the component will increase, and when the thickness t3 of a single battery piece is less than 70 μm, the reliability of the component cannot be guaranteed. For example, the thickness t3 of a single battery piece can be 70 μm, 90 μm, 110 μm, 130 μm, 150 μm or 180 μm.

[0056] Referring to Figure 2 , the utility model discloses a photovoltaic module containing laminated piece 1 in above -mentioned embodiment, including frame 2 and laminated piece 1, laminated piece 1 is fixed in frame 2.

[0057] Specifically, as shown in Figure 1 and Figure 2 The photovoltaic module of the utility model embodiment includes frame 2 and laminated piece 1, and the laminated piece includes cover plate 11, first adhesive film 12, battery piece 13, second adhesive film 14 and back plate 15 arranged in turn. Cover plate 11 and back plate 15 tempered glass play the role of supporting and protecting the component, and the laminated piece 1 is fixed in the fixed groove 21 of the frame 2. Cover plate 11 and back plate 15 have a certain gap with frame 2, and the gap is filled with glue, which enhances the fixing effect of the laminated piece 1. The glue used is silicone glue, polyurethane glue or epoxy resin glue. The frame 2 is preferably a frame with a coefficient of expansion closer to tempered glass to avoid stress concentration caused by inconsistent thermal deformation. For example, a glass fiber organic material composite frame is used.

[0058] In an optional embodiment, referring to Figure 2 , the spacing between the laminated piece 1 and the frame 2 along the length or width direction of the photovoltaic module is a, and 5.5mm≤a≤7mm.

[0059] Specifically, as shown in Figure 2As shown, the laminate 1 has a certain gap between the inner wall of the frame fixing groove 21 and the length direction or width direction of the photovoltaic module. In some embodiments, the cover plate 11 has a certain gap between one side of the length direction and the inner wall of the fixing groove 21, or both sides have a certain gap with the inner wall of the fixing groove 21. It should be noted that when both sides of the cover plate 11 or the back plate 15 have a certain gap with the inner wall of the fixing groove 21, the interval a is the sum of the gap on both sides. For example, the cover plate 11 and the back plate 15 have a certain gap between the inner wall of the fixing groove 21 in the length direction, and the gap on both sides is equal to relieve the rupture caused by the extrusion between the tempered glass and the frame 2 in the process of thermal deformation. When the interval a is greater than 7mm, the amount of glue needs to be increased to increase the manufacturing cost, and the reliability of the photovoltaic module will be affected; when the interval a is less than 5.5mm, the interval is too small to ensure the assembly gap between the laminate 1 and the frame 2, which may cause inaccurate installation. For example, the interval a can be 5.5mm, 5.7mm, 6mm, 6.2mm, 6.5mm or 7mm.

[0060] On the basis of the above-mentioned embodiments, the frame is a composite material frame containing glass fibers, wherein 5.5mm≤a≤6.5mm.

[0061] Specifically, as shown in the drawings, Figure 2 When the composite material frame containing glass fibers is used, in order to improve the positioning accuracy between the frame 2 and the laminate 1 and reduce the amount of glue, the interval a between the cover plate 11 and the back plate 15 and the frame 2 satisfies: 5.5mm≤a≤6.5mm, for example, the interval a can be 5.5mm, 5.6mm, 5.8mm, 6mm, 6.2mm or 6.5mm.

[0062] The photovoltaic module provided in the embodiments of the utility model is applied to a photovoltaic system. According to the application scene division, the photovoltaic system can be a water photovoltaic system, a land photovoltaic system or a building roof photovoltaic system. For example, the photovoltaic module of the embodiment is used in a photovoltaic building integrated system, and the heat resistance and fireproof performance of the photovoltaic module are improved, and the reliability and safety of the photovoltaic system are improved.

[0063] It should be noted that in this paper, the term "including", "containing" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0064] The embodiments of the present application are described above with reference to the drawings; however, the present application is not limited to the specific embodiments described above, but the specific embodiments described above are merely illustrative rather than restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and these all belong to the protection of the present application.

Claims

1. A laminate characterized by, The cover plate, the first adhesive film, the battery piece, the second adhesive film and the back plate are arranged in sequence. The first adhesive film is arranged between the battery piece and the cover plate, and the second adhesive film is arranged between the battery piece and the back plate. The cover plate is arranged on the first surface of the battery piece, and the back plate is arranged on the second surface of the battery piece. The thickness of the cover plate is t1, and the thickness of the back plate is t2, and 0.2mm≤|t1-t2|≤2.5mm.

2. The laminate of claim 1, wherein, 0.2mm≤|t1-t2|≤1mm.

3. The laminate according to claim 1 or 2, characterized in that 2mm≤t1≤3.2mm, and 1.1mm≤t2≤1.6mm.

4. The laminate according to claim 1 or 2, characterized in that 1.1mm≤t1≤1.6mm, and 2mm≤t2≤3.2mm.

5. The laminate according to claim 1 or 2, characterized in that The cover plate is physical toughened glass, and the back plate is chemical toughened glass.

6. The laminate of claim 5, wherein, 2mm≤t1≤3mm, and 1.4mm≤t2≤1.6mm.

7. The laminate according to any one of claims 1-2, 6, wherein, the first adhesive film has a grammage g1 of 250 g / m 2 ≤ g1≤ 520 g / m 2 , and / or the second adhesive film has a grammage g2 of 250 g / m 2 ≤ g2≤ 520 g / m 2 .

8. The laminate of claim 7, wherein, 290 g / m 2 ≤ gi≤ 310 g / m 2 .

9. The laminate of claim 7, wherein, 440 g / m 2 ≤ g2≤ 460 g / m 2 .

10. A photovoltaic module, characterized by, The frame and the laminated piece of any one of claims 1 to 9 are included. The laminated piece is fixed in the frame.

11. The photovoltaic module of claim 10, wherein, The distance between the laminated piece edge and the frame along the length or width direction of the photovoltaic module is a, and 5.5mm≤a≤7mm.

12. The photovoltaic module of claim 11, wherein, The frame is a composite material frame containing glass fiber, and 5.5mm≤a≤6.5mm.

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