WO2021036273A1

WO2021036273A1 - Frame for solar photovoltaic module and photovoltaic module

Info

Publication number: WO2021036273A1
Application number: PCT/CN2020/084110
Authority: WO
Inventors: 林丽芬
Original assignee: 林丽芬
Priority date: 2019-08-28
Filing date: 2020-04-10
Publication date: 2021-03-04
Also published as: CN111064426A; CN211046850U

Abstract

Provided are a frame for solar photovoltaic module and a photovoltaic module. The frame comprises a closed cavity (11), a mounting notch (14) for mounting a photovoltaic module (8) is arranged in the upper portion of the closed cavity (11); the frame uses cold bending of a metal sheet and metal extrusion to form the closed cavity (11) and a mounting structure, the closed cavity (11) is filled with the foaming material. The steel thin sheet is selected, and a main body structure of the frame of the module is manufactured using the cold bending and rolling forming process, so that the strength of the frame of the module is greatly improved, further, the cellular structure foaming material with high strength and good adhesion is arranged in the cavity of the the frame of the module, so that the foaming material and the steel module frame are stressed together, and the yield strength of the module combined frame is further enhanced. Compared with the increase of the quality of the frame by the foaming material, the effect of filling the cavity with the foaming material on the increase of the structural strength is more obvious.

Description

Frame for solar photovoltaic module and photovoltaic module

Technical field

The invention relates to the technical field of photovoltaic modules, in particular to a frame for solar photovoltaic modules and photovoltaic modules.

Background technique

Generally, a frame is installed around the periphery of the photovoltaic module, the edge of the solar cell laminate is accommodated in the notch of the frame, and the photovoltaic module is installed on the support through the frame. The frame of the photovoltaic module plays a role in enhancing the strength of the module and sealing the edge of the module.

Before 2012, there were silicon wafers of various shapes and sizes such as 100-156mm, and the industry standards were not uniform; in 2015, the five major manufacturers unified the standard to 156.75 mm (ie M2 wafers) to the mainstream monocrystalline silicon in the industry in 2018 The wafers have all been designed with a size of 156.75 mm, and the current market share is 85%; in June 2019, the 166 mm wafers launched on the market pushed the wafer size to the redundancy limit of the current industrial chain production line; August 2019 , The market has launched a 210mm large silicon wafer, pushing the large size to the extreme. Large-size silicon wafers will inevitably bring large-size components. Therefore, it is particularly important to design and produce new frames that adapt to the latest silicon wafers and component sizes. .

Moreover, with the development of technology, the thickness of photovoltaic glass has a tendency to gradually become thinner, and the thickness has changed from 3.2mm to 2.5mm, or even 2.0mm. According to different module types, it can be divided into single glass module and double glass module. The glass thickness of single glass module varies from 3.2mm to 2.8mm; the glass thickness of double glass module varies from 2.5+2.5mm to 2.0+2.0mm. Changes in component thickness also require frame design to follow up with the latest component thickness design requirements.

The frames of existing photovoltaic modules are mostly made of aluminum alloy materials, which have the following disadvantages:

1. The strength of the existing aluminum frame is limited. Throughout the history of the development of photovoltaic modules, the size of the module has changed from 250*175*25mm to the current 1950*995*45mm. The size of the module has increased a lot, and it will develop towards larger sizes in the future. As the module size becomes larger, the frame size of the aluminum photovoltaic module develops toward a larger frame cross section and thicker thickness. The essential reason for this phenomenon is the low strength of the aluminum material itself. When the module size becomes larger , The use of aluminum alloy materials to make the profile, the module frame section needs to be reinforced with a larger section and thicker structure, and a larger section and thicker structure will increase the use cost. 2. The existing aluminum frame has high transportation and storage costs. As the height of photovoltaic modules increases, that is, the module height changes from 25mm to the current 40mm or even larger, the packaging costs and transportation costs of photovoltaic modules have also increased, and the storage space of photovoltaic modules has also been restricted.

3. The height limit of the junction box is reduced. The junction box is an important part of the photovoltaic module. It contains important components such as diodes or power switches. The design of the module frame must consider the influence of the junction box-the design height under the module frame is usually higher than the height of the junction box. The thickness of the junction box of the traditional technology is 20mm. With the development of technology, it has now reached 18mm. It can be seen that the height of the junction box does not affect the height of the module frame. The semiconductor chip is directly integrated with the junction box copper bar to make the wiring. The box is moving in a thinner direction. However, the height of the aluminum frame cannot be effectively reduced due to the low yield strength of the material, which is not conducive to reducing the cost of frame consumables and components.

In summary, the use of higher-strength materials to make thinner bezels is the development direction of component packaging technology.

Summary of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a frame for solar photovoltaic modules and photovoltaic modules.

The present invention provides a frame for solar photovoltaic modules, and its technical solution includes:

It includes a closed cavity, and an installation notch for installing photovoltaic modules is arranged above the closed cavity; and is characterized in that:

The frame is formed by cold-rolled steel sheet or extrusion formed by alloy material;

A filling structure is provided in the closed cavity;

The frame is cold-formed by using steel plate or metal alloy plate as the base material, and the outer surface of the frame is provided with a corrosion-resistant metal coating, or protected by brushing paint; or,

The frame is extruded and formed by using aluminum alloy or magnesium alloy as a base material, and the surface of the aluminum alloy or magnesium alloy is oxidized or protected by brushing paint.

The frame for solar photovoltaic modules provided by the present invention further includes the following subsidiary technical solutions:

Wherein: the left frame of the closed cavity extends upward to form a vertical frame, and the top of the vertical frame extends to the right to form a top frame;

The lower frame of the closed cavity extends to the right to form a bottom frame;

The vertical frame, the top frame, and the upper frame of the cavity form the installation slot for installing the photovoltaic module.

Wherein, the top frame of the closed cavity extends rightward to form a lower frame, the lower frame extends upward to form a vertical frame, and the vertical frame extends to the left to form a top frame;

The bottom frame, the vertical frame, the top frame, and the upper frame of the cavity form the installation slot for installing the photovoltaic module.

Wherein, the surface of the steel or hard aluminum alloy sheet is plated with a corrosion-resistant coating, an oxidation coating or a paint coating, and the thickness of the metal sheet is 0.3-1.2 mm, preferably 0.4-0.6 mm.

Wherein, the foaming material is made of organic foaming material or inorganic foaming material.

Wherein, the foaming material is a rigid polyurethane foam plastic or an unsaturated polyester plastic, the unsaturated polyester plastic includes two components A and B, and the A component includes an unsaturated polyester resin, a thickener, Initiator and filler, component B is glass fiber grit or glass fiber mat.

Wherein, the vertical frame, the top frame, and the bottom frame are all rolled to form at least a two-layer structure.

Wherein, the edge seam of the frame is rolled and occluded or welded to form a closed cavity.

Wherein, in the process of rolling the frame with a steel plate or a metal alloy plate, or extruding the frame with an aluminum alloy or magnesium alloy, a filling structure is provided in the cavity of the frame for foaming.

Wherein, the inner connection of the long side and the short side of the frame is provided with a first connecting piece, the first connecting piece is detachably fixed on the bottom wall, and the first connecting piece is used for the same frame The connection between the long side and the short side on the top.

Wherein, a second connecting piece is provided at the outer connection of the long side and the short side of the frame, and the second connecting piece is used for the connection between adjacent frames.

Wherein, the outer sides of the long side and the short side of the frame are connected by welding, and the welding can be resistance welding, laser welding or cold welding.

The present invention also provides a photovoltaic module, which includes the aforementioned frame for a solar photovoltaic module.

The implementation of the present invention includes the following technical effects:

The solar photovoltaic module frame provided by the present invention is suitable for single-sided modules and double-sided modules. The main structure of the module frame is made by selecting steel plates or metal alloy plates and adopting the process of cold-rolling forming, thereby greatly increasing the number of modules. The strength of the frame, this is because the strength of the steel can reach more than three times the strength of the aluminum material, which fundamentally solves the problem of the strength of the module frame; and further provides a high-strength and good adhesiveness in the cavity of the module frame. Foam material to make the foam material and the steel component frame work together to further enhance the yield strength of the component frame. It can be seen that because the steel sheet is used in the present invention, the steel sheet is cold-rolled into a module frame with a cavity, and at the same time, a foaming material is arranged in the cavity, which can greatly increase the strength of the module frame. Therefore, the present invention There is no need to set the height of the module frame higher to accommodate large-size photovoltaic modules, so that the thickness and weight of the module frame can be effectively reduced. The frame structure extruded by using aluminum alloy or magnesium alloy as the base material can also play a significant role in reinforcement.

Specifically, in the current 72 large modules, the height of the frame in the present invention is about 25mm. By filling the cavity with materials to increase the strength, the frame of the present invention can be used for larger-specification modules without increasing The height of the border. Therefore, compared with the current module frame with a height of 45 mm, the module frame of the present invention can reduce the transportation cost by about 44%, and the storage space can save 44%. Its 4-point fixed installation method can save 50% of the number of press blocks.

Moreover, considering that when the frame material is changed from aluminum alloy to steel, its strength increases, but thicker steel is used, and its weight will also increase greatly. Especially steel does not have the extrusion conditions of aluminum alloy, and the bending The processing difficulty and process cost of welding the steel into a whole are relatively high. The present invention creatively uses the very light special effect of foaming materials to foam in the bent steel forming frame to form an integral frame with a honeycomb structure. Ensure the strength of the component frame without affecting the weight of the component frame.

In the present invention, the extension length of the bottom wall is set to be greater than the extension length of the upper wall and the lower wall, so as to connect the integral frame with the purlin of the photovoltaic support, so that the module and the purlin can be directly connected instead of using the traditional pressing block to connect the purlin. The components are connected with the purlins of the photovoltaic support, saving installation materials and installation labor costs.

Description of the drawings

Fig. 1 is a schematic structural diagram of a frame for a solar photovoltaic module according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a frame for a solar photovoltaic module according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of the structure of the first connecting member of the present invention.

Fig. 4 is a schematic diagram of the installation of the first connector of the present invention.

Fig. 5 is a schematic diagram of the structure of the second connecting member of the present invention.

Fig. 6 is a schematic diagram of the installation of the second connector of the present invention.

Fig. 7 is a schematic diagram of the connection of the long side and the short side of the frame for the solar photovoltaic module of the present invention.

Figure 8 is a finite element analysis diagram.

Fig. 8 is a schematic diagram of the calculated cross section.

Figure 10 is a finite element analysis diagram.

detailed description

The exemplary embodiments will be described in detail here, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present invention. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

Generally, plate rolling is a process of continuous three-point bending of the sheet metal using a plate rolling machine. The equipment puts the sheet between the upper and lower work rolls during the rolling. The upper roller is raised and lowered vertically, and the two lower rollers rotate and move horizontally relative to the axis of the upper roller. When the upper roll descends, the plate is plastically deformed and bent between the upper and lower work rolls. The continuous rotation of the bottom roller drives the steel plate to advance and retreat through the friction between the plate and the roller to complete the coiling. The entire process also includes operations such as pre-bending, centering, rounding, and rounding.

There are many types of foaming materials in the chemical industry. According to the hardness, they can be divided into soft, rigid and semi-rigid. According to the density, they can be divided into low-foaming foam, medium-foaming foam and high-foaming foam. Common foaming process methods such as intermittent foaming method, molded foaming method, extrusion foaming method, etc., extrusion foaming method is preferably used. The extrusion foaming method is to add the plastic material containing the foaming agent into the extruder, after the screw is rotated and the barrel is heated, the material is sheared, melted, plasticized, and mixed, and the molten material is extruded from the die of the machine head. It changes from high pressure to normal pressure when it is out, so that the gas dissolved in the material expands to complete the foaming. The most prominent feature of this molding method is continuous production, and different types of products can be produced by changing the head.

The more preferred polyurethane PU foamed joint fillers have been widely used in home improvement doors and windows and other fields. Polyurethane rigid foam is a low-density microporous material with a closed-cell structure. It has the advantages of light weight, high specific strength, low thermal conductivity, low water absorption, and convenient construction and operation. It can be changed by changing the material composition, formula ratio, Synthetic conditions and methods to prepare foam materials with different hardness, chemical resistance and mechanical strength. Many physical properties of polyurethane foam materials depend on its cell structure. For rigid foam, closed-cell structure is appropriate for the cells.

As shown in Figures 1-3 and 5, a frame for solar photovoltaic modules provided by the present invention includes a closed cavity 1; an installation notch for installing photovoltaic modules is provided above the closed cavity;

A filling structure is provided in the closed cavity;

The frame is cold-formed by using steel plate or metal alloy plate as the base material, and the outer surface of the frame is provided with a corrosion-resistant metal coating, or is protected by brushing paint; or,

It should be noted that the closed cavity described in the present invention is not strictly "closed", that is, the cavity is as closed as possible.

The solar photovoltaic module frame provided by the present invention is suitable for single-sided modules and double-sided modules. The main structure of the module frame is made by selecting thin steel plates and adopting the process of cold-rolling forming, thereby greatly increasing the combined frame of the module This is because the strength of steel can reach more than three times the strength of aluminum, which fundamentally solves the problem of the strength of the module frame; and furthermore, a foam with high strength and good adhesion is set in the cavity of the module frame. Material, so that the foamed material and the steel component frame bear the force together, thereby further enhancing the yield strength of the component frame. It can be seen that because the steel sheet is used in the present invention, the steel sheet is cold-rolled into a module frame with a cavity, and at the same time, a foaming material is arranged in the cavity, which can greatly increase the strength of the module frame. Therefore, the present invention There is no need to set the height of the module frame higher to accommodate large-size photovoltaic modules, so that the thickness and weight of the module frame can be effectively reduced.

Among them, the foaming material can be made of organic or inorganic materials, preferably rigid polyurethane foam or unsaturated polyester plastic. The unsaturated polyester plastic includes two components A and B, and the A component includes unsaturated polyester. Resin, thickener, initiator, and filler. The B component is glass fiber grit or glass fiber mat.

Specifically, the polyurethane foam in the present invention, referred to as polyurethane rigid foam, has excellent properties such as light weight, high strength, good dimensional stability, and strong adhesion. It is resistant to metals such as steel, aluminum, stainless steel, wood, concrete, and asphalt. Most plastic materials have good bonding strength. Moreover, since the closed cell rate of rigid polyurethane is more than 95%, it is a hydrophobic material, so that the module frame in this application has moisture-proof and water-proof properties; furthermore, because polyurethane is a difficult-to-use flame retardant after adding a flame retardant. The flammable self-extinguishing material has a softening point of more than 250 degrees Celsius, so that the frame of the module in this application has fire-retardant, flame-retardant, and high-temperature resistance performance. Finally, the component frame in the present application has strong resistance to deformation, is not easy to crack, and has a stable and safe finish.

As shown in FIG. 1, in one embodiment, the left frame 111 of the closed cavity 11 extends upward to form a vertical frame 12, and the top of the vertical frame 12 extends to the right to form a top frame 13;

The lower frame 112 of the closed cavity 11 extends to the right to form a bottom frame 15;

The vertical frame 12, the top frame 13, and the upper frame 113 of the cavity 11 form the installation slot 14 for installing the photovoltaic module 8.

As shown in FIG. 2, in one embodiment, the top frame 211 of the closed cavity 21 extends to the right to form a lower frame 26, the lower frame 26 extends upwards to form a vertical frame 22, and the vertical frame 22 extends to the left. Form a top frame 23;

The lower frame 212 of the closed cavity 21 extends to the right to form a bottom frame 25;

The bottom frame 25, the vertical frame 22, the top frame 23, and the upper frame 213 of the cavity 21 form the installation slot 24 for installing the photovoltaic module 8.

In addition, the steel sheet for coiling can also preferably use the highly corrosion-resistant coated steel sheet "SuperDyma" developed by Nippon Steel, or the aluminum-magnesium-zinc steel sheet of Pohang Steel, Korea. Take Nippon Steel SuperDyma as an example. Its coating composition is mainly zinc, a new type of corrosion-resistant coated steel sheet composed of 11% aluminum, 3% magnesium and a trace amount of silicon. It has good rust resistance and processing properties, such as flat surface. It has good rust prevention at the end and the bending part and the stretched part are not easy to rust. There are few scratches on the surface of the processed part, and the weldability and paintability are also very good.

Moreover, the adoption of the latest anti-corrosion measures or the use of anti-corrosion finished steel can provide the steel with a service life of 30-50 years, thereby fundamentally solving the problem of corrosion and service life of the steel.

In some preferred embodiments, as shown in FIG. 1, the vertical frame 12, the top frame 13, and the bottom frame 15 are all rolled to form a double-layer structure.

In this embodiment, considering that the photovoltaic module is placed in the mounting slot 14 formed by the vertical frame 12, the top frame 13, and the upper frame 112 of the cavity 11, the vertical frame 12 and the top frame 13 are both rolled to form a double-layer structure , To prevent the photovoltaic module placed in the installation slot 14 from squeezing and deforming the vertical frame 12 and the top frame 13. At the same time, this embodiment takes into account the need to pass through the bottom frame 5 of the frame; the photovoltaic module and the overall frame are fixed on the purlin. Therefore, in this embodiment, the bottom frame 15 of the frame is set in a double-layer structure to increase the bottom frame 15. Strength of.

In some embodiments, as shown in FIGS. 1-3, 5, and 6, the edge seam of the frame is rolled and occluded or welded to form a closed cavity.

In some embodiments, when the frame is rolled by a steel plate or a metal alloy sheet, or the frame is extruded by an aluminum alloy or magnesium alloy, a filling structure is provided in the cavity of the frame. Foaming. The steel rolling process and the foaming process in this embodiment can be performed at the same time, that is, foaming while rolling is achieved, which cannot be achieved with the aluminum frame manufacturing process using the injection molding process. In addition, the production process of foaming while rolling is simple and easy to realize; and the foaming area can be controlled, and the foaming speed can be controlled at the same time, so as to control the production quality of the frame and the uniformity of foaming.

In some embodiments, as shown in Figures 3 and 4, a first connector 6 is provided at the inner connection of the long side and the short side of the frame. The first connector 6 is detachably fixed on the bottom wall 13. The connecting piece 6 is used for the connection between the long side and the short side on the same frame.

For ease of description, this embodiment only uses the installation method of the first connector in the embodiment structure corresponding to FIG. 1 as an example for description, and the installation method of the first connector in the embodiment structure corresponding to FIG. 2 corresponds to FIG. 1 The installation method of the first connecting member in the structure of the embodiment is completely the same, and the description is not repeated in this embodiment.

In some embodiments, as shown in Figs. 5 and 6, a second connector 7 is provided at the outer connection of the long side and the short side of the frame, and the second connector 7 is used for the connection between adjacent frames.

Specifically, the connecting pieces are inserted into the long and short sides of the assembly respectively, and the connection is completed by the friction formed by the extrusion or the alveolar engagement on the structure, or the connection is made by arranging structural glue.

In some embodiments, as shown in FIG. 7, the outer joints of the long side and the short side of the frame may be connected by a welding process to connect the long side and the short side as a whole.

Among them, the welding methods in this embodiment include resistance welding, laser welding and cold welding.

The implementation of the present invention adds force analysis from the software simulation calculation:

Based on the finite element analysis software Solidworks, the stress analysis of the component frame under unfavorable wind loads is carried out. The selected steel material is Q345, the components are fixed according to the installation method and the constraints are set accordingly (that is, the long side is fixed at two points), and the load is 2400Pa (which can meet the basic wind pressure calculation of not greater than 0.85KN/m2) and the pressure load is transferred to the module frame On the long side, the calculated stress and deformation results are shown in Figure 8.

It can be seen from Figure 7 that under the action of the component under a load of 2400 Pa, without considering the advantageous effect of the glass stiffness, the steel coiled frame calculation can meet the strength requirements, and the deformation is small.

The specific calculation process is as follows:

Calculation conditions:

Taking the section in Figure 9 as the calculation model, the thickness of the surface sheet is 0.6mm, and the interior is filled with foam materials such as polyurethane.

Calculation assumptions:

A. The inner filling foam material can work together with the surface sheet.

B. The external environment temperature (-20°～30°) has no effect on the bending and compressive strength of the internal filling material.

C. The surface sheet is made of Q345 steel.

D. The inner filling polyurethane material δ filling takes 30Mpa

E. The calculated graphics and cross-sections are shown in Figure 8.

Calculation of bearing capacity:

The calculation formula of flexural bearing capacity is simulated by the following formula:

M=δ×W1+γ×δ×W2; where,

δ is the yield strength of rolled steel, which can be 305Mpa;

W1 is the section modulus of rolled steel, which is calculated and determined according to the actual section height and width;

γ is the strength reduction coefficient of the material, which varies according to the filling material, and the value is 0.5～0.9;

δ is the yield strength of the filling material, such as polyurethane material can take a value of 30Mpa.;

W2 is the section modulus of the filling material, which is calculated and determined according to the actual section height and width.

The finite element simulation is shown in Figure 10.

The finite element stress analysis is shown in Figure 8.

Through the above computer analysis, we can get:

a. The foamed filling material and the rolled steel are tightly combined to bear the force. The filling material in the rolled steel can provide about 10-15% of the bearing capacity according to the overall cross-sectional form, cavity volume, filling material, etc., finite element The simulation value agrees with the theoretical calculation value.

b. The foamed material provides strength and stability for the overall frame, and reduces the height of the frame structure. The frame height of the 72 pieces of modules commonly used in the market is preferred. The frame height in this example can be within 28mm, compared with the conventional height of 35-45mm aluminum frame There is a big advantage.

The present invention also provides a photovoltaic module. The photovoltaic module includes the above-mentioned frame for solar photovoltaic modules. Since the improvement is only on the frame, the present invention does not describe other structures of the photovoltaic module in detail, and all existing structures can be used. Technical structure.

Those skilled in the art will easily think of other embodiments of the present invention after considering the description and practice. This application is intended to cover any variations, uses, or adaptive changes of the present invention. These variations, uses, or adaptive changes follow the general principles of the present invention and include common knowledge or customary technical means in the technical field where the present invention is not invented. . The description and the embodiments are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the claims.

Claims

A frame for a solar photovoltaic module, comprising a closed cavity, and an installation notch for installing photovoltaic modules is arranged above the closed cavity; characterized in that,

A filling structure is provided in the closed cavity;

The frame is cold-formed by using steel plate or metal alloy plate as the base material, and the outer surface of the frame is provided with a corrosion-resistant metal coating, or is protected by brushing paint; or,

The frame is extruded and formed by using aluminum alloy or magnesium alloy as a base material, and the surface of the aluminum alloy or magnesium alloy is oxidized or protected by brushing paint.
The frame for a solar photovoltaic module according to claim 1, wherein the left frame of the closed cavity extends upward to form a vertical frame, and the top of the vertical frame extends to the right to form a top frame;

The lower frame of the closed cavity extends to the right to form a bottom frame;

The vertical frame, the top frame, and the upper frame of the cavity form the installation slot for installing the photovoltaic module.
The frame for a solar photovoltaic module according to claim 1, wherein the top frame of the closed cavity extends to the right to form a lower frame, the lower frame extends upward to form a vertical frame, and the vertical frame faces to the left. Extend to form a top frame;

The lower frame of the closed cavity extends to the right to form a bottom frame;

The bottom frame, the vertical frame, the top frame, and the upper frame of the cavity form the installation slot for installing the photovoltaic module.
The frame for a solar photovoltaic module according to any one of claims 1 to 3, wherein the filling structure is made of an organic foam material or an inorganic foam material.
The frame for a solar photovoltaic module according to claim 4, wherein the organic foaming material is rigid polyurethane foam plastic or unsaturated polyester plastic, and the unsaturated polyester plastic includes A and B. Components, A component includes unsaturated polyester resin, thickener, initiator, and filler, B component is glass fiber grit or glass fiber mat.
The frame for a solar photovoltaic module according to claim 1 or 2, wherein the vertical frame, the top frame, and the bottom frame are all rolled to form at least a two-layer structure.
The frame for a solar photovoltaic module according to claim 4, wherein the edge seam of the frame is rolled, snapped, or welded to form a closed cavity.
The frame for a solar photovoltaic module according to claim 4, characterized in that: in the process of rolling the frame with steel plate or metal alloy sheet, or extruding the frame with aluminum alloy or magnesium alloy, The cavity of the frame is provided with a filling structure for foaming.
The frame for a solar photovoltaic module according to claim 4, characterized in that: the inner connection of the long side and the short side of the frame is provided with a first connector, and the first connector is detachably fixed to On the bottom wall, the first connecting member is used for the connection between the long side and the short side on the same frame.
The frame for a solar photovoltaic module according to claim 9, wherein a second connector is provided at the outer connection of the long side and the short side of the frame, and the second connector is used for the adjacent frame the connection between.
The frame for a solar photovoltaic module according to claim 4, wherein the long sides and short sides of the frame are connected by welding at the outer side seams, and the welding method includes resistance welding, laser welding, or cold welding. Welding.
A photovoltaic module, characterized in that: the photovoltaic module comprises the frame for solar photovoltaic modules according to any one of claims 1-11.