Shock-resistant photovoltaic module

Abstract

The utility model discloses an impact-resistant photovoltaic assembly. The impact-resistant photovoltaic assembly comprises convex front glass and a laminated piece, the convex front glass is arranged above the laminated piece; the edge of the convex front glass is bonded with the laminated piece through a bonding layer; and a gap is formed between the convex cavity of the convex front glass and the laminated piece. Due to the existence of the gap, the convex front glass is not in direct contact with the battery piece, the stress is buffered to a certain extent when reaching the battery piece, the bearing force of the battery piece is reduced, the effect of protecting the battery piece is achieved, and therefore the photovoltaic assembly provided by the utility model has shock resistance. Meanwhile, when the convex front glass is provided with the anti-impact layer, the anti-impact layer deforms and can absorb more impact kinetic energy, so that the stress on the battery piece is reduced, the effect of protecting the battery piece is further achieved, and the anti-impact performance of the assembly is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic module technical field, especially to the photovoltaic module of impact resistance. BACKGROUND

[0002] In the global scope, along with the increase of people's demand for renewable energy and the concern for environmental sustainability, the photovoltaic industry has developed rapidly, and photovoltaic modules have been widely used all over the world. However, extreme weather occurs frequently today, among many extreme weather events that affect photovoltaic power stations, hail is one that can cause significant losses. A hailstorm can bring devastating damage, but climate change is likely to bring more and larger hailstorms in the future. The impact of hail will cause the glass on the surface of the photovoltaic module and the internal battery pieces to break, thereby affecting the power generation efficiency of the photovoltaic module and the power generation capacity of the entire power station.

[0003] In today's photovoltaic industry, in order to better respond to hail disasters, it is common to increase the thickness of the glass and use encapsulation adhesive film with good impact resistance to improve the module, but these improvement measures have certain limitations. For example, the tensile strength of PVB encapsulation adhesive film is higher than that of EVA in theory, the elastic deformation capacity is better, and the impact resistance is also better. However, due to the thickness of the adhesive film used in the module is generally around 0.4mm, which is relatively thin; during actual testing, the anti-hail capacity of the module encapsulated with PVB adhesive film is not enhanced compared with the module encapsulated with EVA adhesive film. In addition, the thickness of the glass can improve the anti-hail impact resistance of the module to some extent. For single-glass or double-glass modules, the increase in thickness and weight of the module increases the cost. In addition, due to the small thickness of the adhesive film between the glass and the battery piece, the impact stress on the glass is basically directly transmitted to the battery piece. For single-glass modules, the back is a back plate that is more flexible than glass, and it does not support the battery piece when impacted by hail stress, so the front glass may not be broken, but the battery piece may be broken and become black, affecting current transmission and thus affecting the power generation performance of the module. In addition, tests have found that when the glass thickness of the same module is increased to 3.2mm, the anti-hail effect is not significantly improved compared with the module with a glass thickness of 2.8mm when the hail diameter is 45mm or more, and the cost will also increase. SUMMARY

[0004] In order to solve the problem of insufficient impact resistance of the existing photovoltaic module and the inability to respond to large-size hail disasters, the utility model provides a photovoltaic module with impact resistance.

[0005] The anti-impact photovoltaic module provided by the utility model, comprising convex front glass and laminated part, the convex front glass is arranged above the laminated part, the edge of the convex front glass is bonded with the laminated part through the adhesive layer, and a gap exists between the convex cavity of the convex front glass and the laminated part.

[0006] Optionally, the laminated part comprises back glass, back adhesive film, battery string and front adhesive film which are sequentially stacked from bottom to top, and the front adhesive film is bonded with the edge of the convex front glass through the adhesive layer.

[0007] Optionally, the adhesive layer is an adhesive pad strip, and the thickness of the adhesive pad strip is 0.1mm-1mm.

[0008] Further optionally, the thickness of the adhesive pad strip is 0.1mm, 0.5mm or 1mm.

[0009] Optionally, an anti-impact layer is arranged in the convex cavity of the convex front glass, and the anti-impact layer is glued to the convex inner wall of the convex front glass.

[0010] Optionally, the anti-impact layer is glued to the convex inner wall of the convex front glass through sealing glue (105).

[0011] Optionally, the anti-impact layer is single-layer or multi-layer elastic anti-impact transparent material.

[0012] Optionally, the anti-impact layer is in the shape of spring, honeycomb, corrugated or net.

[0013] Optionally, the anti-impact photovoltaic module further comprises a module frame, the upper part of the module frame is connected with the upper surface of the edge of the convex front glass, the lower part of the module frame is connected with the lower surface of the laminated part, and the convex part of the convex front glass is flush with or higher than the upper part of the module frame.

[0014] Optionally, the height of the convex cavity of the convex front glass is 1.5mm-5mm.

[0015] Further optionally, the height of the convex cavity of the convex front glass is 1.5mm, 3mm or 5mm.

[0016] Optionally, the convex front glass is full tempered glass, and the back glass is semi-tempered glass.

[0017] The utility model brings the beneficial effects as follows:

[0018] The utility model brings the beneficial effects as follows:(1) The anti-impact photovoltaic module of the utility model, the convex front glass 1 and the front adhesive film 204 do not carry out bonding, can directly use the convex cavity 102, make the convex front glass 1 and the cell piece exist certain distance gap, when the hail directly impacts the surface of the convex front glass 1, the convex part resists stress, and because of the existence of the gap, does not directly contact the cell piece, when stress reaches the cell piece, carries out certain buffer, thereby makes the cell piece to bear force small, plays the role of protecting the cell piece, when the convex front glass 1 is provided with the anti-impact layer 103, the anti-impact layer 103 appears deformation, can absorb more impact kinetic energy, also makes the stress on the cell piece small, further plays the role of protecting the cell piece, thereby improves the anti-impact performance of the module.

[0019] (2) The anti-impact photovoltaic module of the utility model, the convex part of the convex front glass 1 is flush with or higher than the upper portion 401 of the module frame, when using outdoors, also avoids the dust accumulation problem of the existing photovoltaic module because of the frame height being greater than the glass surface, reduces the hot spot risk, thereby improves the outdoor power generation and the service life of the module. BRIEF DESCRIPTION OF DRAWINGS

[0020] For the purpose of illustration and not limitation, the utility model will now be described according to the preferred embodiments of the utility model, in particular with reference to the drawings, wherein:

[0021] Figure 1 It is the anti-impact photovoltaic module structure schematic view of one embodiment of the application;

[0022] Figure 2 It is the convex front glass structure schematic view of the anti-impact photovoltaic module of one embodiment of the application;

[0023] Figure 3 It is the anti-impact photovoltaic module structure schematic view of another embodiment of the application;

[0024] Figure 4 It is the component laying sequence diagram before pre-lamination;

[0025] Figure 5 It is the component laying sequence diagram before formal lamination;

[0026] Figure 6 It is the convex front glass structure schematic view of the anti-impact photovoltaic module of another embodiment of the application;

[0027] Figure 7 It is the anti-impact photovoltaic module structure schematic view of another embodiment of the application;

[0028] Figure 8A schematic diagram of a photovoltaic module structure with an impact-resistant frame, as per this application;

[0029] in:

[0030] 1. Convex front glass; 101. Edge of convex front glass; 102. Raised cavity; 103. Impact-resistant layer; 104. Raised inner wall; 105. Sealant; 2. Laminate; 201. Back glass; 202. Back adhesive film; 203. Battery string; 204. Front adhesive film; 205. Release film; 206. Front glass; 3. Adhesive layer; 4. Module frame; 401. Upper part of module frame; 402. Lower part of module frame. Detailed Implementation

[0031] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application. For the sake of brevity, the same or similar reference numerals are used for the same or similar devices in the description of the various embodiments of the present application.

[0032] It should be noted that, where there is no conflict, the implementation methods and features of the implementation methods of this application can be combined with each other.

[0033] like Figure 1 As shown, in one embodiment of this application, the impact-resistant photovoltaic module includes a convex front glass 1 and a laminate 2; the convex front glass 1 is disposed above the laminate 2; the edge 101 of the convex front glass is bonded to the laminate 2 by an adhesive layer 3; a gap exists between the protruding cavity 102 of the convex front glass 1 and the laminate 2. The height of the protruding cavity 102 of the convex front glass 1 is 1.5mm to 5mm.

[0034] Figure 2 An embodiment of a convex front glass is shown, the convex front glass 1 including an edge 101 and a raised cavity 102.

[0035] like Figure 3 As shown, in one embodiment of this application, the laminate 2 of the impact-resistant photovoltaic module includes a back glass 201, a back encapsulant film 202, a cell string 203, and a front encapsulant film 204 stacked sequentially from bottom to top; the front encapsulant film 204 is bonded to the edge 101 of the convex front glass through an adhesive layer 3. The adhesive layer 3 is an adhesive pad with a thickness of 0.1mm to 1mm. The convex front glass is fully tempered glass, and the back glass 201 is semi-tempered glass. The adhesive pad can be made of a transparent material with the same fluidity as the front encapsulant film 204, and no interface will appear during the reaction process. This adhesive pad can also be an adhesive layer that is built into the convex front glass 1 and can bond with the front encapsulant film 204.

[0036] Figure 3 The preparation method of the anti-impact photovoltaic module is as follows: as shown in Figure 4 The back glass 201, the back adhesive film 202, the cell string 203, the front adhesive film 204, the release film 205, and the front glass 206 of the anti-impact photovoltaic module are sequentially laid from bottom to top, and the relative positions of the cell string 203 and the glass and other materials are ensured during laying, and then pre-lamination is performed. The air in the module is extracted by vacuumizing, and then the adhesive film is melted by heating to bond the cells and the glass together, and the module is taken out after cooling. The module is turned over, and the release film 205 and the front glass 206 are removed, and at this time the front adhesive film 204 of the module faces upward. As shown in Figure 5 The adhesive pad strips consistent with the width of the edge 101 of the convex front glass are placed on both sides of the front adhesive film 204, and the adhesive pad strips can be made of a transparent substance consistent with the flowability of the front adhesive film 204 and without an interface during the reaction process. The adhesive pad strips can also be the adhesive layer of the convex front glass 1 that can bond with the front adhesive film 204. Then formal lamination is performed, as shown in Figure 3 The edge 101 of the convex front glass is bonded with the adhesive pad strips, and the convex cavity 102 of the convex front glass 1 is not bonded with the front adhesive film 204, and a gap exists. Due to the existence of the gap, the convex front glass 1 does not directly contact the cell sheet, and the stress is buffered to a certain extent when reaching the cell sheet, the force borne by the cell sheet is small, and the cell sheet is protected. The photovoltaic module prepared by the method has anti-impact performance.

[0037] As shown in Figure 6 In an embodiment of the present application, the anti-impact layer 103 is arranged in the convex cavity 102 of the convex front glass 1 of the anti-impact photovoltaic module; the anti-impact layer 103 is glued to the convex inner wall 104 of the convex front glass 1. The convex front glass 1 is full tempered glass. The anti-impact layer 103 and the convex inner wall 104 of the convex front glass 1 can be glued by the sealing glue 105. The anti-impact layer 103 is a single layer or multiple layers of elastic anti-impact transparent material. The anti-impact layer 103 can be in the form of a spring, and high-elasticity and transparent materials such as glass fiber are used. The glass fiber has a large elongation within the elastic limit and high tensile strength, can absorb a large amount of impact energy, and can provide good anti-impact performance for the module. The anti-impact layer 103 can also be in the form of a honeycomb, a corrugated shape, or a net shape, etc. The anti-impact layer 103 and the convex inner wall 104 of the convex front glass 1 are bonded together by the sealing glue 105, and become an integral whole after curing.

[0038] As shown in Figure 7As shown in one embodiment of the present application, the anti-impact photovoltaic module comprises a convex front glass 1 and a laminated piece 2; the convex front glass 1 is arranged above the laminated piece 2; the edge 101 of the convex front glass is bonded to the laminated piece 2 through an adhesive layer 3; there is a gap between the convex cavity 102 of the convex front glass 1 and the laminated piece 2. The laminated piece 2 comprises, from bottom to top, a back glass 201, a back adhesive film 202, a cell string 203, and a front adhesive film 204 arranged in sequence; the front adhesive film 204 is bonded to the edge 101 of the convex front glass through the adhesive layer 3. An anti-impact layer 103 is arranged in the convex cavity 102 of the convex front glass 1; the anti-impact layer 103 is glued to the convex inner wall 104 of the convex front glass 1 through a sealing glue 105.

[0039] Figure 7 The preparation method of the anti-impact photovoltaic module is as follows: as shown in Figure 4 The back glass 201, the back adhesive film 202, the cell string 203, the front adhesive film 204, the release film 205, and the front glass 206 of the anti-impact photovoltaic module are arranged in sequence from bottom to top, and the relative positions of the cell string 203 and the glass and other materials are ensured during the arrangement, and then pre-lamination is performed. The air in the module is extracted by vacuumizing, and then the adhesive film is melted by heating to bond the cell and the glass together, and the module is taken out after cooling. The module is turned over, and the release film 205 and the front glass 206 are removed, and at this time the front adhesive film 204 of the module faces upward. As shown in Figure 5 The adhesive pads are placed on both sides of the edge of the front adhesive film 204, and the width of the adhesive pads is consistent with that of the edge 101 of the convex front glass. The adhesive pads can be made of a transparent substance with the same flowability as the front adhesive film 204, and no interface will appear during the reaction. The adhesive pads can also be the adhesive layer of the convex front glass 1 that can be bonded to the front adhesive film 204. Then formal lamination is performed, as shown in Figure 7 The edge 101 of the convex front glass is bonded to the adhesive pads, and the convex cavity 102 of the convex front glass 1 is not bonded to the front adhesive film 204, and there is a gap and the anti-impact layer 103. In this way, when the hail directly hits the surface of the convex front glass 1, the deformation of the convex front glass 1 and the anti-impact layer 103 will not directly affect the cell string 203, and the anti-impact layer 103 can absorb more impact kinetic energy, effectively reducing the kinetic energy transmitted to the cell string 203, reducing the impact on the cell string 203, and forming good protection for the cell string 203.

[0040] As shown in Figure 8As shown, in some embodiments of the present application, the impact-resistant photovoltaic module further comprises a module frame 4, the upper part 401 of the module frame is connected with the upper surface of the edge 101 of the convex front glass, and the lower part 402 of the module frame is connected with the lower surface of the laminated piece 2; the convex part of the convex front glass 1 is flush with or higher than the upper part 401 of the module frame. The convex part of the convex front glass 1 is flush with or higher than the upper part 401 of the module frame, which avoids the dust accumulation caused by the existing module with the frame height greater than the glass surface, reduces the risk of hot spot, improves the outdoor power generation and the service life of the module.

[0041] The impact-resistant photovoltaic module of the present application, the convex part of the convex front glass 1 can be used directly or with a transparent impact-resistant layer, the module manufacturing process is first pre-laminated at high temperature and high pressure, a release film 205 is placed between the front glass 206 and the front adhesive film 204 before pre-laminating, the release film 205 and the front glass 206 are removed after pre-laminating, the convex front glass 1 directly replaces the front glass 206, or the convex front glass 1 with an impact-resistant layer 103 inside replaces the front glass 206 and is bonded around the edge with the previous part, the bonding process can be done by high-temperature and high-pressure melting adhesive film bonding or room temperature and pressure adhesive tape bonding, the manufactured photovoltaic module has excellent impact resistance, can better cope with outdoor hail stress impact, and improves the reliability of the photovoltaic module.

[0042] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can occur depending on design requirements and other factors. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An impact-resistant photovoltaic module, characterized in that, The impact-resistant photovoltaic module includes a convex front glass (1) and a laminate (2); the convex front glass (1) is disposed above the laminate (2); the edge (101) of the convex front glass is bonded to the laminate (2) by an adhesive layer (3); there is a gap between the convex cavity (102) of the convex front glass (1) and the laminate (2); an impact-resistant layer (103) is disposed in the convex cavity (102) of the convex front glass (1); the impact-resistant layer (103) is bonded to the convex inner wall (104) of the convex front glass (1); the impact-resistant layer (103) is a single layer or multiple layers of elastic impact-resistant transparent material.

2. The impact-resistant photovoltaic module according to claim 1, characterized in that, The laminate (2) includes a back glass (201), a back adhesive film (202), a battery string (203) and a front adhesive film (204) stacked sequentially from bottom to top; the front adhesive film (204) is bonded to the edge (101) of the convex front glass by an adhesive layer (3).

3. The impact-resistant photovoltaic module according to claim 1 or 2, characterized in that, The adhesive layer (3) is an adhesive pad, and the thickness of the adhesive pad is 0.1mm to 1mm.

4. The impact-resistant photovoltaic module according to claim 1 or 2, characterized in that, The impact-resistant layer (103) is bonded to the raised inner wall (104) of the convex front glass (1) by sealant (105).

5. The impact-resistant photovoltaic module according to claim 1 or 2, characterized in that, The impact-resistant layer (103) is spring-shaped, honeycomb-shaped, corrugated, or mesh-shaped.

6. The impact-resistant photovoltaic module according to claim 1 or 2, characterized in that, The impact-resistant photovoltaic module also includes a module frame (4), the upper part (401) of the module frame is connected to the upper surface of the edge (101) of the convex front glass, and the lower part (402) of the module frame is connected to the lower surface of the laminate (2); the protruding part of the convex front glass (1) is flush with or higher than the upper part (401) of the module frame.

7. The impact-resistant photovoltaic module according to claim 1 or 2, characterized in that, The height of the convex cavity (102) of the convex front glass (1) is 1.5mm to 5mm.

8. The impact-resistant photovoltaic module according to claim 2, characterized in that, The convex front glass (1) is fully tempered glass; the back glass (201) is semi-tempered glass.

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