Photovoltaic module

Abstract

The invention relates to a photovoltaic module which comprises a cover plate, a back plate, a battery string and a damping adhesive tape. The vibration reduction rubber strip comprises a vibration reduction base body and a vibration reduction body, a containing cavity is formed in the vibration reduction base body, the vibration reduction body is arranged in the containing cavity, and the containing cavity can be compressed. Therefore, when the outside impacts the photovoltaic module, the accommodating cavity is compressed, and the damping adhesive tape plays a role in buffering and damping, so as to resist the outside impact, prevent the battery string from being damaged, and prolong the service life of the photovoltaic module.

Description

Technical Field

[0001] The invention relates to a photovoltaic module. Background Art

[0002] As the core component of the photovoltaic power generation system, the photovoltaic module includes a cover plate, a back plate and a battery string encapsulated between the cover plate and the back plate by an adhesive layer. Among them, when the cover plate and the back plate are made of glass, they can be installed in an environment with good load-bearing capacity, such as being laid on the ground over a large area. When the cover plate and the back plate are made of plastic or other polymer film layers, the weight of the photovoltaic module can be reduced, so that it can be installed in an installation environment with poor load-bearing capacity, such as industrial and commercial light steel roofs with poor load-bearing capacity.

[0003] But no matter which type of photovoltaic module, under the influence of external impact, the internal battery string is prone to resonance, which in turn causes damage to the battery string, which will affect the service life of the photovoltaic module.

[0004] In summary, there is an urgent need for a photovoltaic module with good vibration reduction performance. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a photovoltaic module with good vibration reduction performance.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions.

[0007] A photovoltaic module comprises: a cover plate, a back plate, a battery string encapsulated between the cover plate and the back plate, and a vibration-damping rubber strip encapsulated between the cover plate and the back plate and not blocking the battery string; the vibration-damping rubber strip comprises a vibration-damping matrix and a vibration-damping body, the vibration-damping matrix is ​​provided with a receiving cavity, the vibration-damping body is arranged in the receiving cavity, and the receiving cavity is compressed.

[0008] Optionally, the vibration damper is an elastomer.

[0009] Optionally, the material of the vibration-damping matrix includes at least one of ethylene-vinyl acetate copolymer, polyolefin elastomer, polyethylene foam, polyvinyl butyral and thermoplastic polyolefin, and the material of the vibration-damping body includes at least one of nitrile rubber and chloroprene rubber.

[0010] Optionally, a compressible gap is formed between the vibration damping body and the accommodating cavity.

[0011] Optionally, the accommodating cavity is in the form of a groove opening toward the battery string, and the vibration damping body is located in the groove.

[0012] Optionally, the vibration-damping rubber strip is located between the battery string and the cover plate, and the vibration-damping matrix is ​​a strip-shaped structure, including a plurality of wave crest structures arranged at intervals, and the surface of the wave crest structure facing the battery string forms the groove.

[0013] Optionally, the accommodating cavity is a closed cavity structure, and the vibration damping body is located in the cavity structure.

[0014] Optionally, the cover plate comprises an upper plate, a honeycomb core layer and a lower plate, all of which are light-transmissive and stacked in sequence; the upper plate is away from the battery string relative to the lower plate.

[0015] Optionally, the honeycomb core layer includes a plurality of honeycomb holes connected to each other, and each of the honeycomb holes is provided with a reinforcement connected to the inner wall of the honeycomb hole.

[0016] Optionally, a plurality of reinforcing members are disposed in each of the honeycomb holes, and a connecting member is also disposed in the honeycomb hole, and the plurality of reinforcing members are interconnected via the connecting member.

[0017] Optionally, a cross section of the reinforcement member perpendicular to the conducting direction of the honeycomb holes is Y-shaped or X-shaped.

[0018] Optionally, the materials of the upper plate, the honeycomb core layer and the lower plate all include at least one of polycarbonate and polymethyl methacrylate.

[0019] Optionally, an ultraviolet protection layer is provided on the outer surface of the upper plate.

[0020] Optionally, the back plate includes a first adhesive film, a reinforcing rib, a second adhesive film and a support plate stacked in sequence, the reinforcing rib is closer to the battery string relative to the support plate, and the first adhesive film is connected to the battery string through a third adhesive film.

[0021] Optionally, the reinforcing ribs are in a honeycomb-shaped mesh structure.

[0022] Optionally, the reinforcing ribs are made of glass fibers having a diameter of 50-60 μm.

[0023] Optionally, the material of the first adhesive film includes at least one of polyvinyl butyral and thermoplastic polyolefin; the materials of the second adhesive film and the third adhesive film each include at least one of ethylene-vinyl acetate copolymer, polyolefin elastomer and polyethylene foam; the material of the support plate includes at least one of polypropylene and polycarbonate.

[0024] Optionally, the vibration-damping rubber strip is connected to the battery string via a fourth adhesive film, and a material of the fourth adhesive film includes at least one of ethylene-vinyl acetate copolymer, polyolefin elastomer and polyethylene foam.

[0025] Optionally, the photovoltaic assembly further includes a frame, the frame including a receiving groove, the receiving groove receiving edges of the lower panel and the back panel, the end of the wall of the receiving groove abutting against the side of the honeycomb core layer and being located between the upper panel and the lower panel.

[0026] Optionally, the distance between the upper surface of the lower plate and the lower surface of the back plate is smaller than the opening width of the receiving groove of the frame, and an adhesive is filled between the receiving groove and the back plate.

[0027] The technical solution of the present invention has the following beneficial effects:

[0028] The photovoltaic module provided by the present invention has a vibration-damping rubber strip arranged between the cover plate and the back plate. The vibration-damping rubber strip includes a vibration-damping base and a vibration-damping body. The vibration-damping body is arranged in a receiving cavity of the vibration-damping base, and the receiving cavity can be compressed. In this way, when the outside world gives an impact force to the photovoltaic module, the receiving cavity is compressed, and then the vibration-damping rubber strip plays a role of buffering and vibration reduction to resist the external impact force, avoid damage to the battery string, and increase the service life of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a photovoltaic module provided by an embodiment of the present invention;

[0030] Figure 2 A top view of a vibration-damping rubber strip provided in one embodiment of the present invention;

[0031] Figure 3 A schematic diagram of the relative positions between the vibration-damping rubber strip and the battery string provided in one embodiment of the present invention;

[0032] Figure 4 A schematic diagram of the cross-sectional structure of a vibration-damping rubber strip provided in one embodiment of the present invention;

[0033] Figure 5 A schematic diagram of a cross-sectional structure of a vibration-damping rubber strip provided in yet another embodiment of the present invention;

[0034] Figure 6 A schematic diagram of the structure of a honeycomb core layer provided by one embodiment of the present invention;

[0035] Figure 7 A schematic structural diagram of a reinforcing rib provided in one embodiment of the present invention.

[0036] Among them, 1-cover plate; 11-upper plate; 12-honeycomb core layer; 121-honeycomb hole; 122-reinforcement member; 123-connector; 13-lower plate; 2-vibration-damping rubber strip; 21-vibration-damping matrix; 22-vibration-damping body; 23-accommodating cavity; 3-fourth rubber film; 4-battery string; 5-third rubber film; 6-back plate; 61-first rubber film; 62-reinforcement rib; 63-second rubber film; 64-support plate; 7-frame. DETAILED DESCRIPTION

[0037] In practical applications, photovoltaic modules will inevitably be subject to external impact forces, especially lightweight photovoltaic modules. When subjected to external impact forces, the battery strings are more easily damaged. For example, the cover material of lightweight photovoltaic modules is made of polyethylene terephthalate, ethylene-vinyl acetate copolymer or fluoroplastic, rather than conventional glass cover. When this type of photovoltaic module encounters relatively severe hail weather and faces intensive external attacks, the battery strings are prone to resonance, which in turn causes damage to the internal battery strings. This will not only affect the power generation of the photovoltaic module, shorten the life of the photovoltaic module, but may even cause major safety issues such as fire, posing a serious threat to the stability and safety of the entire photovoltaic system. In order to solve the above technical problems, the present invention provides the following photovoltaic modules.

[0038] like Figure 1 As shown, the photovoltaic module provided by the embodiment of the present invention may include: a cover plate 1, a back plate 6, a battery string 4 encapsulated between the cover plate 1 and the back plate 6, and a vibration-damping rubber strip 2 encapsulated between the cover plate 1 and the back plate 6 and not covering the battery string 4. Figure 2 As shown, the vibration-damping rubber strip 2 may include a vibration-damping matrix 21 and a vibration-damping body 22 . The vibration-damping matrix 21 may be provided with a receiving cavity 23 . The vibration-damping body 22 may be disposed in the receiving cavity 23 . The receiving cavity 23 may be compressed.

[0039] The photovoltaic module provided by the present invention has a vibration-damping rubber strip 2 disposed between the cover plate 1 and the back plate 6. The vibration-damping rubber strip 2 includes a vibration-damping base 21 and a vibration-damping body 22. The vibration-damping body 22 is disposed in a receiving cavity 23 of the vibration-damping base 21, and the receiving cavity 23 can be compressed. In this way, when the outside world gives an impact force to the photovoltaic module, the receiving cavity 23 is compressed, and then the vibration-damping rubber strip 2 plays a role of buffering and vibration reduction, so as to resist the impact force given by the outside world, avoid damage to the battery string 4, and improve the service life of the photovoltaic module.

[0040] Among them, Figure 3 As shown, the vibration-damping rubber strip 2 does not block the battery string 4, or the vibration-damping rubber strip 2 can be set at the edge of the battery string 4 to avoid affecting the light absorption efficiency of the battery string 4. Specifically, when the vibration-damping rubber strip 2 is set at the edge of the battery string 4, it can be located in the same layer as the battery string 4, or it can be aligned with the edge of the battery string 4 and located in a different layer from the battery string 4.

[0041] In the embodiment of the present invention, the accommodating cavity 23 can be compressed by the following embodiments:

[0042] In some embodiments, the vibration damper 22 may be an elastomer, so that when the photovoltaic module is subjected to external impact force, the vibration damping matrix 21 may compress the elastomer, which increases the deformation of the vibration damping rubber strip 2, thereby achieving better vibration reduction and buffering effects. Specifically, the vibration damper 22 can absorb a large amount of impact energy through its own deformation, converting the energy into elastic potential energy or thermal energy, thereby achieving a buffering effect, effectively reducing the impact energy transmitted to the inside of the photovoltaic module, and providing the most direct protective barrier for the battery string 4. Specifically, the shape of the elastomer may be spherical, cylindrical, cubic, or other shapes.

[0043] In some embodiments, the material of the vibration-damping matrix 21 may include at least one of ethylene-vinyl acetate copolymer, polyolefin elastomer, polyethylene foam, polyvinyl butyral and thermoplastic polyolefin, which makes the vibration-damping matrix 21 softer than glass or metal, and has a certain degree of deformability under the action of impact force, thereby making the vibration-damping matrix 21 itself compressible, so that the vibration-damping rubber strip 2 as a whole is elastic and compressible.

[0044] The material of the vibration damping body 22 may include at least one of nitrile rubber and chloroprene rubber, so that the vibration damping body 22 has elastic properties.

[0045] In addition, due to its soft nature, the vibration-damping rubber strip 2 can evenly disperse the local impact force to a larger area, which helps to avoid damage to the photovoltaic module structure caused by excessive local stress.

[0046] In other embodiments, a compressible gap is formed between the vibration damping body 22 and the accommodating cavity 23. In this way, when the outside world gives an impact force to the photovoltaic module, the gap is compressed, which enables the vibration damping rubber strip 2 to play a role of buffering and vibration reduction to resist the impact force given by the outside world, avoid damage to the battery string 4, and increase the service life of the photovoltaic module. In the embodiment of the present invention, the number of accommodating cavities 23 can be multiple, and they can be evenly arranged on the vibration damping base 21. Each accommodating cavity 23 can accommodate one vibration damping body 22, or multiple vibration damping bodies 22. The accommodating cavity 23 can be designed in various forms, and several embodiments are given below:

[0047] In one embodiment, Figure 1 or Figure 4As shown, the accommodating cavity 23 may be a groove with its opening facing the battery string 4, and the vibration-damping body 22 may be located in the groove. The vibration-damping rubber strip 2 may be located between the cover plate 1 and the battery string 4, or between the back plate 6 and the battery string 4. Since there are many impact factors on the light-receiving surface of the photovoltaic module, the vibration-damping rubber strip 2 is preferably arranged between the cover plate 1 and the battery string 4, and the vibration-damping rubber strip 2 is connected to the battery string 4 through the fourth adhesive film 3. When the accommodating cavity 23 can be compressed due to the gap, the opening of the groove faces downward, and a gap is formed between the top of the groove and the vibration-damping body 22. When subjected to external impact force, the gap at the top of the vibration-damping body 22 is compressed to achieve vibration reduction and buffering effects.

[0048] Further, continue to refer to Figure 4 The vibration-damping matrix 21 may be a strip-shaped structure, and may include a plurality of wave peak structures arranged at intervals, wherein the wave peak structure forms a groove on the surface facing the battery string 4. It is understandable that the wave peak structure forms a convex surface on the surface of the vibration-damping matrix 21, and a concave surface is formed between adjacent wave peak structures. With such a configuration, when subjected to external impact, the top of the wave peak structure is compressed first, thereby compressing the gap between the accommodating cavity 23 and the vibration-damping body 22 and / or compressing the elastic vibration-damping body 22. Since the wave peak structure is a convex structure, it can produce multi-directional deformation, such as vertical force and lateral force, etc., so that the impact force can be dispersed in multiple dimensions, and the buffering effect is more three-dimensional and efficient. In this way, the vibration-damping matrix 21 and the vibration-damping body 22 cooperate to more effectively eliminate external impact forces to protect the battery string 4.

[0049] In another embodiment, Figure 5 As shown, the accommodating cavity 23 may also be a closed cavity structure, and the vibration-damping body 22 may be located in the cavity structure, thereby preventing the vibration-damping body 22 from being separated from the vibration-damping base 21 .

[0050] In some embodiments, continue to refer to Figure 1 The cover plate 1 may include an upper plate 11, a honeycomb core layer 12 and a lower plate 13, all of which are light-transmissive and stacked in sequence. The upper plate 11 is away from the battery string 4 relative to the lower plate 13. The structure of the honeycomb core layer 12 can reduce the weight of the cover plate 1, and can evenly distribute the local force of a small area to the entire cover plate 1, that is, convert high-intensity point force into low-intensity surface force. There are a large number of regular holes in the honeycomb structure, which will produce relatively stable hole collapse when subjected to impact force, effectively absorbing the impact energy, thereby reducing the impact force transmitted to components such as the vibration-damping rubber strip 2 and the battery string 4.

[0051] Furthermore, if Figure 6As shown, the honeycomb core layer 12 may include a plurality of honeycomb holes 121 connected to each other, and each honeycomb hole 121 may be provided with a reinforcement 122 connected to the inner wall of the honeycomb hole 121, which can improve the degree of densification inside the honeycomb and increase the plastic deformation area of ​​the honeycomb during the impact process, thereby increasing the bearing capacity and impact resistance of the honeycomb core layer 12. Each honeycomb hole 121 may have one reinforcement 122 or multiple reinforcements 122. When multiple reinforcements 122 are provided in each honeycomb hole 121, a connecting member 123 is also provided in the honeycomb hole 121, and multiple reinforcements 122 are connected to each other through the connecting member 123, which further enhances the impact resistance and bearing performance of the cover plate 1. Among them, the cross-section of the reinforcement 122 perpendicular to the conduction direction of the honeycomb hole 121 may be Y-shaped or X-shaped.

[0052] In some embodiments, the materials of the upper plate 11, the honeycomb core layer 12 and the lower plate 13 may include at least one of polycarbonate and polymethyl methacrylate, and the transparency thereof is 90%-95%, for example, 90%, 92%, 94% or 95%, etc. The above materials can make the cover plate 1 have good light transmittance and good weather resistance to protect the battery string 4.

[0053] Furthermore, the outer surface of the upper plate 11 may be provided with an ultraviolet protection layer, which may be a fluorine-containing coating to resist ultraviolet radiation and prevent the photovoltaic module from aging.

[0054] In some embodiments, continue to refer to Figure 1 The back plate 6 may include a first adhesive film 61, a reinforcing rib 62, a second adhesive film 63 and a support plate 64 stacked in sequence, wherein the reinforcing rib 62 may be closer to the battery string 4 relative to the support plate 64, and the first adhesive film 61 may be connected to the battery string 4 through the third adhesive film 5. The reinforcing rib 62 is close to the battery string 4, which can share and buffer the external force, thereby reducing the risk of deformation and hidden cracks of the battery string 4.

[0055] In some embodiments, Figure 7 As shown, the reinforcing ribs 62 may be a honeycomb-shaped mesh structure, which can reduce the weight of the photovoltaic module while dispersing the external pressure on the photovoltaic module, and the structure has the advantages of high strength and high support. The honeycomb shape may be a polygon, such as a pentagon, hexagon or special shape.

[0056] In some embodiments, the reinforcing ribs 62 may be woven from glass fibers with a diameter of 50-60 μm, thereby improving the bearing capacity of the back plate 6. The diameter of the glass fibers may be 50 μm, 52 μm, 54 μm, 56 μm, 58 μm or 60 μm.

[0057] Furthermore, the material of the first adhesive film 61 may include at least one of polyvinyl butyral and thermoplastic polyolefin. The first adhesive film 61 is located above the reinforcing rib 62, plays a certain supporting role, and can resist impact force to protect the battery string 4. The materials of the second adhesive film 62, the third adhesive film 5 and the fourth adhesive film 3 may include at least one of ethylene-vinyl acetate copolymer, polyolefin elastomer and polyethylene foam, which are used to bond the various component structures and play the role of encapsulating and protecting the photovoltaic components; the material of the support plate 64 may include at least one of polypropylene and polycarbonate, so that it has good protection, weather resistance and electrical insulation performance, and compared with the traditional glass plate, the support plate 64 is lighter.

[0058] In some embodiments, continue to refer to Figure 1 The photovoltaic module may further include a frame 7, wherein the frame 7 may include a receiving groove, the receiving groove may receive the edge of the lower plate 13 and the back plate 6, and the end of the wall of the receiving groove may abut against the side of the honeycomb core layer 12 and be located between the upper plate 11 and the lower plate 13. Since the horizontal height of the frame 7 is lower than the horizontal height of the photovoltaic module, under the action of rainwater, such an embedded method allows the dust or foreign matter accumulated on the front of the photovoltaic module to slide off from around the photovoltaic module, effectively avoiding the hot spot phenomenon caused by the long-term shading of the photovoltaic module by foreign matter, thereby avoiding affecting the performance of the photovoltaic module.

[0059] Furthermore, the distance between the upper surface of the lower plate 13 and the lower surface of the back plate 6 can be smaller than the opening width of the receiving groove of the frame 7, so as to facilitate the laminate to be loaded into the frame 7, and an adhesive can be filled between the receiving groove and the back plate 6 to encapsulate the photovoltaic module. The adhesive can be formed by silica gel.

[0060] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module comprises: Cover plate (1); Back plate (6); A battery string (4) encapsulated between the cover plate (1) and the back plate (6); A vibration-damping rubber strip (2) is encapsulated between the cover plate (1) and the back plate (6) and does not block the battery string (4), the vibration-damping rubber strip (2) comprising a vibration-damping base (21) and a vibration-damping body (22), the vibration-damping base (21) is provided with a receiving cavity (23), the vibration-damping body (22) is arranged in the receiving cavity (23), and the receiving cavity (23) is compressed.

2. The photovoltaic module according to claim 1, characterized in that: The vibration damping body (22) is an elastic body.

3. The photovoltaic module according to claim 1, characterized in that: The material of the vibration-damping matrix (21) includes at least one of ethylene-vinyl acetate copolymer, polyolefin elastomer, polyethylene foam, polyvinyl butyral and thermoplastic polyolefin, and the material of the vibration-damping body (22) includes at least one of nitrile rubber and chloroprene rubber; Preferably, the vibration-damping rubber strip (2) is connected to the battery string (4) via a fourth adhesive film (3), and the material of the fourth adhesive film (3) includes at least one of ethylene-vinyl acetate copolymer, polyolefin elastomer and polyethylene foam.

4. The photovoltaic module according to claim 1, characterized in that: A compressible gap is formed between the vibration damping body (22) and the accommodating cavity (23).

5. The photovoltaic module according to claim 2 or 4, characterized in that: The accommodating cavity (23) is in the form of a groove with its opening facing the battery string (4), and the vibration-damping body (22) is located in the groove.

6. The photovoltaic module according to claim 5, characterized in that: The vibration-damping rubber strip (2) is located between the battery string (4) and the cover plate (1); the vibration-damping matrix (21) is in a strip-shaped structure, comprising a plurality of wave crest structures arranged at intervals; the surface of the wave crest structure facing the battery string (4) forms the groove.

7. The photovoltaic module according to claim 2 or 4, characterized in that: The accommodating cavity (23) is a closed cavity structure, and the vibration damping body (22) is located in the cavity structure.

8. The photovoltaic module according to claim 1, characterized in that: The cover plate (1) comprises an upper plate (11), a honeycomb core layer (12) and a lower plate (13) which are all light-transmissive and stacked in sequence; the upper plate (11) is away from the battery string (4) relative to the lower plate (13); Preferably, the honeycomb core layer (12) comprises a plurality of honeycomb holes (121) connected to each other, and each of the honeycomb holes (121) is provided with a reinforcement member (122) connected to the inner wall of the honeycomb hole (121); Preferably, a plurality of reinforcing members (122) are provided in each of the honeycomb holes (121), and a connecting member (123) is also provided in the honeycomb holes (121), and the plurality of reinforcing members (122) are connected to each other via the connecting member (123); Preferably, the cross section of the reinforcement member (122) perpendicular to the conducting direction of the honeycomb hole (121) is Y-shaped or X-shaped; Preferably, the materials of the upper plate (11), the honeycomb core layer (12) and the lower plate (13) all include at least one of polycarbonate and polymethyl methacrylate; Preferably, the outer surface of the upper plate (11) is provided with an ultraviolet protection layer.

9. The photovoltaic module according to claim 1, characterized in that: The back plate (6) comprises a first adhesive film (61), a reinforcing rib (62), a second adhesive film (63) and a support plate (64) stacked in sequence, the reinforcing rib (62) being closer to the battery string (4) relative to the support plate (64), and the first adhesive film (61) being connected to the battery string (4) via a third adhesive film (5); Preferably, the reinforcing ribs (62) are in a honeycomb-shaped mesh structure; Preferably, the reinforcing rib (62) is made of glass fiber with a diameter of 50-60 μm; Preferably, the material of the first adhesive film (61) includes at least one of polyvinyl butyral and thermoplastic polyolefin; the materials of the second adhesive film (63) and the third adhesive film (5) both include at least one of ethylene-vinyl acetate copolymer, polyolefin elastomer and polyethylene foam; and the material of the support plate (64) includes at least one of polypropylene and polycarbonate.

10. The photovoltaic module according to claim 8, characterized in that: The photovoltaic module further comprises a frame (7), the frame (7) comprising a receiving groove, the receiving groove receiving the edges of the lower plate (13) and the back plate (6), the end of the wall of the receiving groove abutting against the side of the honeycomb core layer (12) and being located between the upper plate (11) and the lower plate (13); Preferably, the distance between the upper surface of the lower plate (13) and the lower surface of the back plate (6) is smaller than the opening width of the receiving groove of the frame (7), and an adhesive is filled between the receiving groove and the back plate (6).

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