Frame, photovoltaic module and photovoltaic system

Abstract

The invention relates to the field of photovoltaic technology, and provides a frame, a photovoltaic module and a photovoltaic system, and the frame comprises a first frame edge and a second frame edge which are connected. The frame edge of the frame is formed at the end, away from the second frame edge, of the first frame edge, a mounting hole is formed in the first frame edge in a penetrating mode, a stress concentration forming structure is arranged on the inner hole face of the mounting hole, and the stress concentration forming structure and the position, closest to the frame edge, of the inner hole face of the mounting hole are arranged at intervals in the circumferential direction of the mounting hole. According to the frame, the photovoltaic module and the photovoltaic system provided by the invention, the problem that load failure cracks are easy to generate at the mounting holes of the frame of the existing photovoltaic module can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of photovoltaic technology, and in particular to a frame, a photovoltaic module, and a photovoltaic system. Background Technology

[0002] Most existing photovoltaic (PV) modules are encapsulated with frames made of materials such as aluminum alloy. These frames not only provide mechanical protection but also serve as the primary connection between the PV module and the mounting bracket. Currently, in ground-mounted power stations or rooftop systems, the most common installation method is to connect the PV module to the mounting bracket using bolts. The bolts pass through mounting holes on the C-side of the frame to complete the connection, but these holes are precisely where stress concentration is likely to occur, making them prone to load-bearing failure cracks. Summary of the Invention

[0003] This disclosure provides a frame, a photovoltaic module, and a photovoltaic system, aiming to improve the problem of load failure cracks easily generated at the mounting holes of existing photovoltaic module frames.

[0004] According to some embodiments of the present disclosure, one aspect of the present disclosure provides a border, the border including a first border edge and a second border edge connected together;

[0005] The end of the first frame away from the second frame forms the edge of the frame. A mounting hole is provided through the first frame. A stress concentration formation structure is provided on the inner surface of the mounting hole. The stress concentration formation structure and the position of the inner surface of the mounting hole closest to the edge of the frame are spaced apart in the circumferential direction of the mounting hole.

[0006] In some embodiments, the stress concentration formation structure is a notch.

[0007] In some embodiments, the notch is an arc-shaped notch.

[0008] In some embodiments, the stress concentration forming structure is arc-shaped, the radius of the stress concentration forming structure is r, and the minimum distance between the inner surface of the mounting hole and the edge of the frame is c, wherein 0.2≤r / c≤0.4.

[0009] In some embodiments, multiple stress concentration forming structures are provided at circumferential intervals along the mounting holes.

[0010] In some embodiments, the mounting hole is provided with the stress concentration forming structure at at least one end in a direction perpendicular to the direction from the second frame edge to the edge of the frame.

[0011] In some embodiments, the mounting hole has a dimension of W in the direction from the second frame edge to the edge of the frame, and a dimension of L in the direction perpendicular to the direction from the second frame edge to the edge of the frame, where L is greater than W, so that the frame can be moved and adjusted relative to the screw inserted into the mounting hole in a direction perpendicular to the direction from the second frame edge to the edge of the frame.

[0012] In some embodiments, the mounting hole is an elliptical hole.

[0013] In some embodiments, the mounting hole is provided with two stress concentration structures at each end in a direction perpendicular to the direction from the second frame edge to the edge of the frame;

[0014] The major axis dimension of the elliptical hole is a, where: 1.05≤L / a≤1.29.

[0015] In some embodiments, the mounting holes are symmetrically arranged in a direction perpendicular to the direction from the second frame edge to the edge of the frame.

[0016] In some embodiments, the mounting holes are symmetrically arranged in the direction from the second frame edge to the edge of the frame.

[0017] According to some embodiments of this disclosure, another aspect of this disclosure also provides a photovoltaic module, including:

[0018] The border, which is the border described above;

[0019] A laminate, the laminate being disposed on the frame.

[0020] According to some embodiments of this disclosure, another aspect of this disclosure also provides a photovoltaic system, including:

[0021] Mounting bracket;

[0022] A photovoltaic module, wherein the photovoltaic module is the photovoltaic module described above, and the frame of the photovoltaic module is disposed on the mounting bracket;

[0023] A screw connector, the tail of which passes through the mounting hole of the frame and is threadedly connected to the mounting bracket.

[0024] The technical solutions provided in this disclosure have at least the following advantages:

[0025] In the frame provided in this embodiment, a weak stress region is formed between the inner hole surface of the mounting hole closest to the frame edge and the frame edge. By adding a stress concentration structure at a certain distance from the weak stress region on the inner hole surface of the mounting hole, stress concentration is formed in the area where the stress concentration structure is set, thereby transferring and distributing the stress concentration in the weak stress region. In this way, while meeting the cost reduction requirements of the frame, the stress concentration in the weak stress region can be reduced simply by optimizing the hole shape of the mounting hole, thereby improving the fatigue strength of the weak stress region and significantly reducing the occurrence of load failure cracks in the weak stress region. Attached Figure Description

[0026] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the connection between the frame and the mounting bracket in the prior art.

[0028] Figure 2 for Figure 1 A schematic diagram of the middle frame structure;

[0029] Figure 3 This is a schematic diagram of the connection between a frame and a mounting bracket according to an embodiment of the present disclosure;

[0030] Figure 4 for Figure 3 A schematic diagram of the structure at the mounting holes on the middle frame.

[0031] Explanation of reference numerals in the accompanying drawings:

[0032] Frame 100, first frame edge 1, second frame edge 2, frame edge 3, mounting hole 4, elliptical hole 4a, stress concentration structure 5, notch 5a, weak edge stress area 6, screw connector 200, mounting bracket 300. Detailed Implementation

[0033] As can be seen from the background technology, please refer to Figure 1 and Figure 2The existing photovoltaic module frame 100a is provided with mounting holes 110a, which are usually located on the C-side 120a of the frame 100a. The bolt 200a passes through the mounting hole 110a and is connected to the mounting bracket 300a. Since the on-site installation position is random and uncertain, the mounting hole 110a needs to have the function of allowing the bolt 200a to adjust its position. Therefore, the mounting hole 110a generally adopts an oblong hole structure.

[0034] To reduce costs, the overall size of the frame 100a was compressed, and the wall thickness of the frame C-side 120a was continuously reduced. As a result, the mounting hole 110a experienced increasingly more edge tearing under repeated dynamic and static loads. In addition, the mounting hole 110a was formed by stamping, which inherently has processing defects and stress concentration. The reduced wall thickness further weakened its load-bearing capacity. These two factors combined significantly increased the risk of tearing failure.

[0035] For example, under cost reduction pressure, the width of the frame C-side 120a is compressed to its limit, leaving only enough space to just accommodate the M8 bolt 200a and its washer 400a. The distance between the long side of the mounting hole 110a and the edge of the frame C-side 120a is only about 4.5mm. Under dynamic and static loads, such a narrow edge makes it very easy for the crack 500a to rapidly propagate towards the edge in a direction perpendicular to the long side of the mounting hole 110a.

[0036] This disclosure provides a frame, a photovoltaic module, and a photovoltaic system. A weak stress region is formed between the inner surface of the mounting hole closest to the frame edge and the frame edge itself. By adding a stress concentration structure at a certain distance from the weak stress region on the inner surface of the mounting hole, stress concentration occurs in the area where the stress concentration structure is located, thereby transferring and distributing the stress concentration in the weak stress region. Thus, while meeting the cost reduction requirements of the frame, the stress concentration in the weak stress region can be reduced simply by optimizing the hole shape of the mounting hole, thereby improving the fatigue strength of the weak stress region and significantly reducing the occurrence of load failure cracks in the weak stress region.

[0037] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined. Similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple pieces" refers to two or more pieces (including two pieces).

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0040] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. For example, if the device or element in the illustration is inverted, then the element described as "below," "under," "below," or "bottom" of other elements or features will be oriented "above" or "top" of said other elements or features. Therefore, the term "below" may cover both above and below orientation depending on the context in which the term is used, which will be obvious to those skilled in the art. Materials may be oriented in other ways (e.g., rotated 90 degrees, inverted, flipped), and the spatial relative descriptive terms used herein may be interpreted accordingly.

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0042] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. Furthermore, when describing a component as "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0043] In the description of the embodiments of this application, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. The formation or provision of a second component above or on a first component, or on the surface of a first component, or on one side of a first component, may include embodiments where the first and second components are in direct contact, and may also include embodiments where an additional component may be present between the first and second components, thereby preventing direct contact between the first and second components. For simplicity and clarity, various components may be drawn at different scales. In the drawings, some layers / components may be omitted for simplicity. Unless otherwise specified, the formation or provision of a second component on the surface of a first component refers to direct contact between the first and second components. The term "component" may refer to a layer, film, region, portion, structure, etc.

[0044] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "component" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0045] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0046] This disclosure provides a border, Figure 3 and Figure 4 A preferred embodiment of the border provided in this disclosure is shown.

[0047] Please see Figure 3 and Figure 4In some embodiments, the frame 100 includes a first frame edge 1 and a second frame edge 2 connected together; the end of the first frame edge 1 away from the second frame edge 2 forms the frame edge 3 of the frame 100, and a mounting hole 4 is provided through the first frame edge 1. A stress concentration forming structure 5 is provided on the inner surface of the mounting hole 4, and the stress concentration forming structure 5 and the position of the inner surface of the mounting hole 4 closest to the frame edge 3 are spaced apart in the circumferential direction of the mounting hole 4.

[0048] Specifically, the frame 100 is used to mount the laminate of the photovoltaic module. The frame 100 includes a first frame edge 1 and a second frame edge 2, which are arranged perpendicularly or approximately perpendicularly. One end of the first frame edge 1 is connected to one end of the second frame edge 2. The first frame edge 1 and the second frame edge 2 form the frame C surface and the frame B surface of the frame 100, respectively. The end of the first frame edge 1 away from the second frame edge 2 forms the frame edge 3 of the frame 100. Hereinafter, the length direction of the first frame edge 1 is defined as the front-to-back direction, the thickness direction of the first frame edge 1 is defined as the top-to-bottom direction, and the width direction of the first frame edge 1 is defined as the left-to-right direction. The end of the first frame edge 1 that connects to the second frame edge 2 is the left end of the first frame edge 1, and the end of the first frame edge 1 that forms the frame edge 3 is the right end of the first frame edge 1.

[0049] A mounting hole 4 is provided on the first frame edge 1, extending vertically through the first frame edge 1 and located between the second frame edge 2 and the frame edge 3. This allows the tail of the screw connector 200 to pass through the mounting hole 4 from the top of the first frame edge 1 and be threadedly connected to the mounting bracket 300 located on the lower side of the first frame edge 1, thereby connecting the photovoltaic module frame 100 and the mounting bracket 300 via the screw connector 200. The position S of the inner surface of the mounting hole 4 closest to the frame edge 3 is the position with the smallest horizontal and vertical distance between the inner surface of the mounting hole 4 and the frame edge 3. The position S of the mounting hole 4 can be one or more linear regions; for example, when the mounting hole 4 is a circular or elliptical hole, the position S of the mounting hole 4 is a linear region. The position S of the mounting hole 4 can also be one or more planar regions; for example, when the mounting hole 4 is a square or oblong hole, the position S of the mounting hole 4 is a planar region.

[0050] A weak edge stress region 6 is formed on the first frame edge 1, located between the frame edge 3 and the mounting hole 4. The weak edge stress region 6 is located to the right of the mounting hole 4, and at least covers the position S of the mounting hole 4. For example, the weak edge stress region 6 may only be the region formed by the position S of the mounting hole 4; the weak edge stress region 6 may also be the region formed by the position S of the mounting hole 4 and the position adjacent to the position S of the mounting hole 4. Optionally, please refer to Figure 3 and Figure 4In some embodiments, the weak edge stress region 6 extends along the front-to-back direction. The difference between the strength at each location within the weak edge stress region 6 and the strength at location S of the mounting hole 4 is preset with a strength threshold. This arrangement of the weak edge stress region 6 is relatively reasonable, allowing it to cover the areas with lower strength between the mounting hole 4 and the edge of the frame 3. For example, the strength at any location within the weak edge stress region 6 is Q, the strength at location S of the mounting hole 4 is Q1, and the strength of the smaller of the strengths at the foremost and rearmost locations of the mounting hole 4 is Q2. The setting of Q can be Q1≤Q<Q2; or Q can be 0≤Q-Q1≤A(Q2-Q1), 0.4≤A≤0.6.

[0051] A pre-set stress concentration area is provided on the inner surface of the mounting hole 4. This pre-set stress concentration area can be spaced apart from the edge weak stress area 6 in the circumferential direction of the mounting hole 4; alternatively, it can be spaced apart from the position S of the mounting hole 4 in the circumferential direction. The following explanation will use the example of the pre-set stress concentration area and the edge weak stress area 6 being spaced apart in the circumferential direction of the mounting hole 4. Since the pre-set stress concentration area and the edge weak stress area 6 are spaced apart in the circumferential direction of the mounting hole 4, and the position S of the mounting hole 4 is located within the edge weak stress area 6, the pre-set stress concentration area and the position S of the mounting hole 4 are also spaced apart in the circumferential direction of the mounting hole 4.

[0052] A stress concentration forming structure 5 is provided in the preset stress concentration area. The stress concentration forming structure 5 can create a sudden change in the cross-sectional shape or size of the mounting hole 4 in the preset stress concentration area, thereby achieving stress concentration in the preset stress concentration area. In this way, stress concentration is formed in the preset stress concentration area at a certain distance from the edge weak stress area 6. The preset stress concentration area can transfer and distribute the stress concentration of the edge weak stress area 6. Thus, under the premise of meeting the cost reduction requirement of the frame 100, the stress concentration of the edge weak stress area 6 can be reduced simply by optimizing the hole shape of the mounting hole 4, thereby improving the fatigue strength of the edge weak stress area 6 and significantly reducing the occurrence of load failure cracks in the edge weak stress area 6.

[0053] The frame 100 is designed with a high-strength frame mounting hole structure. By optimizing the structure of the mounting hole 4 on the C-side of the frame, the fatigue strength of the frame 100 is improved.

[0054] A weak stress region 6 is formed between the inner surface of the mounting hole 4 closest to the edge edge 3 and the edge edge 3. By adding a stress concentration structure 5 at a certain distance from the weak stress region 6 on the inner surface of the mounting hole 4, stress concentration is formed in the area where the stress concentration structure 5 is set, thereby transferring and distributing the stress concentration in the weak stress region 6. In this way, while meeting the cost reduction requirement of the frame 100, the stress concentration in the weak stress region 6 can be reduced simply by optimizing the hole shape of the mounting hole 4, thereby improving the fatigue strength of the weak stress region 6 and significantly reducing the occurrence of load failure cracks in the weak stress region 6.

[0055] The embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0056] The first frame edge 1 is provided with mounting holes 4, which can be symmetrically designed or non-symmetrically designed. Optionally, please refer to [link to relevant documentation]. Figure 3 and Figure 4 In some embodiments, the mounting holes 4 are symmetrically arranged in a direction perpendicular to the direction from the second frame edge 2 to the edge of the frame 3; and / or, the mounting holes 4 are symmetrically arranged in a direction from the second frame edge 2 to the edge of the frame 3.

[0057] Specifically, the direction from the second frame edge 2 to the edge of the border 3 is the left-right direction, and the direction perpendicular to the direction from the second frame edge 2 to the edge of the border 3 is the front-back direction. The mounting holes 4 are symmetrically arranged in the left-right direction and / or in the front-back direction. The symmetrical structural design of the mounting holes 4 not only reduces the processing difficulty of the mounting holes 4, but also makes the overall stress distribution at the mounting holes 4 more uniform and regular. The following will introduce the symmetrical arrangement of the mounting holes 4 in the left-right direction and in the front-back direction as an example.

[0058] The specific shape and style of the mounting hole 4 can be set according to the actual situation. For example, the mounting hole 4 can be a circular hole, a square hole, an oblong hole, or an oval hole. The bolt 200 passes through the first frame edge 1 through the mounting hole 4. Since the on-site installation position is random and uncertain, the mounting hole 4 needs to have the function of adjusting the position of the bolt 200. Optionally, please refer to Figure 3 and Figure 4 In some embodiments, the mounting hole 4 has a dimension of W in the direction from the second frame edge 2 to the edge of the frame 3, and a dimension of L in the direction perpendicular to the direction from the second frame edge 2 to the edge of the frame 3, where L is greater than W, so that the frame 100 can be moved and adjusted relative to the screw 200 inserted into the mounting hole 4 in a direction perpendicular to the direction from the second frame edge 2 to the edge of the frame 3.

[0059] Specifically, the dimension of mounting hole 4 in the left-right upward direction is W, and the dimension of mounting hole 4 in the front-back upward direction is L. Since the dimension L of mounting hole 4 in the front-back upward direction is greater than the dimension W of mounting hole 4 in the left-right upward direction, mounting hole 4 can provide a function for adjusting the position of bolt 200 in the front-back upward direction. The following will be an example where the dimension L of mounting hole 4 in the front-back upward direction is greater than the dimension W of mounting hole 4 in the left-right upward direction.

[0060] The dimension L of the mounting hole 4 in the front-to-back direction is greater than the dimension W of the mounting hole 4 in the left-to-right direction. The mounting hole 4 can be a rectangular hole, an oblong hole, or an elliptical hole, etc. When the mounting hole 4 is an oblong hole, the dimension W of the mounting hole 4 in the left-to-right direction is the distance between the two straight sides of the oblong hole; when the mounting hole 4 is an elliptical hole, the dimension W of the mounting hole 4 in the left-to-right direction is the length of the minor axis of the elliptical hole.

[0061] Optionally, please refer to Figure 3 and Figure 4 In some embodiments, the mounting hole 4 is an elliptical hole 4a.

[0062] Specifically, while keeping the dimension W of the mounting hole 4 in the left-right and upward direction unchanged, an elliptical hole 4a is used instead of the oblong hole in the existing technology. The elliptical hole 4a can also achieve the function of allowing the bolt 200 to adjust its position, and the force on the edge of the elliptical hole 4a will be more uniform, thus preventing stress concentration. The following will be introduced using the elliptical hole 4a as an example for mounting hole 4.

[0063] By setting a stress concentration forming structure 5 in the preset stress concentration area on the inner surface of the mounting hole 4, the stress concentration forming structure 5 can form stress concentration in the preset stress concentration area. Stress concentration refers to the phenomenon that the stress is significantly higher than other parts near the abrupt changes in the cross-sectional shape or size of a component, such as holes, grooves, notches, sharp corners, etc. This is because the continuity of the material is disrupted in these abrupt shape regions, making the stress distribution no longer uniform. For example, a small circular hole is made in a plate subjected to tensile force. Without the hole, the stress is uniformly distributed. However, when the hole is made, the stress increases sharply near the edge of the hole. This is because the material is cut off by the hole, and the force that should have been transmitted through the area where the hole is located can only be transmitted through the material around the hole, resulting in increased stress near the edge of the hole.

[0064] As can be seen from the above, there are various ways to specifically set the stress concentration forming structure 5. For example, the stress concentration forming structure 5 can be a notch, groove, opening, crack, protrusion, or sharp corner, etc. Optionally, please refer to Figure 3 and Figure 4 In some embodiments, the stress concentration formation structure 5 is a notch 5a.

[0065] Specifically, the stress concentration formation structure 5 is designed as a notch 5a. This design not only facilitates the machining of the stress concentration formation structure 5 on the inner surface of the mounting hole 4, but also helps to meet the cost reduction requirements of the frame 100. The following will use notch 5a as an example to illustrate the stress concentration formation structure 5. The specific shape of notch 5a can be set according to actual conditions; for example, notch 5a can be a triangular notch, a square notch, or an arc-shaped notch. Optionally, please refer to... Figure 3 and Figure 4 In some embodiments, the notch 5a is an arc-shaped notch. This type of notch 5a is easy to process and shape.

[0066] The notch 5a can be provided on the upper surface of the first frame edge 1; the notch 5a can also be provided in the middle of the first frame edge 1; the notch 5a can also be provided on the lower surface of the first frame edge 1. Optionally, please refer to Figure 3 and Figure 4 In some embodiments, the notch 5a extends vertically and penetrates both the upper and lower surfaces of the first frame edge 1. This vertical penetration of the notch 5a reduces the difficulty of machining it.

[0067] As described above, the stress concentration formation structure 5 can be an arc-shaped notch. Alternatively, please refer to [link to relevant documentation]. Figure 3 and Figure 4 In some embodiments, the stress concentration forming structure 5 is arranged in an arc shape, the radius of the stress concentration forming structure 5 is r, and the minimum distance between the inner hole surface of the mounting hole 4 and the edge of the frame 3 is c, wherein 0.2≤r / c≤0.4.

[0068] Specifically, the ratio of the radius r of the arc-shaped notch 5a to the position S of the mounting hole 4 and the distance c between the edge of the frame 3 satisfies 0.2 ≤ r / c ≤ 0.4. When 0.2 ≤ r / c ≤ 0.4, the pre-set stress concentration area with the notch 5a can effectively distribute the stress concentration in the weak edge area 6, making it less likely to cause stress concentration in the weak edge area 6. For example, r / c can be 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, or 0.40, etc.

[0069] A stress concentration forming structure 5 is provided on the inner surface of the mounting hole 4. The stress concentration forming structure 5 can be single or multiple structures spaced apart along the circumference of the mounting hole 4. Optionally, please refer to... Figure 3 and Figure 4In some embodiments, stress concentration forming structures 5 are provided in multiple circumferentially spaced along the mounting holes 4.

[0070] Specifically, multiple stress concentration formation structures 5 are evenly spaced on the inner surface of the mounting hole 4, thereby forming multiple preset stress concentration areas evenly spaced along the circumference of the mounting hole 4. These multiple preset stress concentration areas can better transfer and distribute the stress concentration of the edge weak area 6, so that the overall stress distribution at the mounting hole 4 will be more uniform.

[0071] Optionally, please refer to Figure 3 and Figure 4 In some embodiments, the mounting hole 4 is provided with a stress concentration forming structure 5 at at least one end in a direction perpendicular to the direction from the second frame edge 2 to the frame edge 3.

[0072] Specifically, a stress concentration forming structure 5 is provided at the front end and / or rear end of the mounting hole 4, thereby forming a predetermined stress concentration area at the front end and / or rear end of the mounting hole 4. For example, please refer to Figure 3 and Figure 4 In some embodiments, two stress concentration formation structures 5 are respectively provided at both ends of the long axis of the elliptical hole 4a, thereby forming two preset stress concentration regions at both ends of the long axis of the elliptical hole 4a. The two preset stress concentration regions at both ends of the long axis of the elliptical hole 4a avoid the edge weak stress region 6. Since the two ends of the long axis of the elliptical hole 4a are relatively far from the edge weak stress region 6, designing preset stress concentration regions at both ends of the long axis of the elliptical hole 4a can transfer and distribute more stress concentration in the edge weak stress region 6, thereby improving the fatigue strength of the edge weak stress region 6.

[0073] By changing the shape and processing technology of the mounting hole 4, the frame 100 changes the hole shape of the mounting hole 4 from waist-shaped to elliptical, so that the stress concentration factor can be reduced from 3.0~5.0 to 1.5~3.0.

[0074] Optionally, please refer to Figure 3 and Figure 4 In some embodiments, the mounting hole 4 is provided with two stress concentration forming structures 5 at both ends in a direction perpendicular to the direction from the second frame edge 2 to the frame edge 3; the major axis dimension of the elliptical hole 4a is a, wherein: 1.05≤L / a≤1.29.

[0075] Specifically, the ratio of the front-to-back upward dimension L of the elliptical hole 4a to the major axis dimension a of the elliptical hole 4a satisfies 1.05 ≤ L / a ≤ 1.29. When 1.05 ≤ L / a ≤ 1.29, the two pre-set stress concentration areas can effectively share the stress concentration in the edge weak stress area 6, making it less likely to cause stress concentration in the edge weak stress area 6. For example, L / a can be 1.05, 1.06, 1.07, 1.08, 1.09, 1.10, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, 1.20, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28, or 1.29, etc.

[0076] Optionally, please refer to Figure 3 and Figure 4 In some embodiments, the nominal diameter of the screw connector 200 is m, the major axis dimension of the elliptical hole 4a is a, and the minor axis dimension of the elliptical hole 4a is b, wherein: 1.5≤a / m≤2.0; and / or, 1≤b / m≤1.4.

[0077] Specifically, when 1.5≤a / m≤2.0 and / or 1≤b / m≤1.4, it is not only beneficial for the elliptical hole 4a to realize the function of adjusting the position of the bolt 200, but also the overall stress distribution at the elliptical hole 4a will be more uniform. For example, a / m can be 1.50, 1.51, 1.52, 1.53, 1.54, 1.55, 1.56, 1.57, 1.58, 1.59, 1.60, 1.61, 1.62, 1.63, 1.64, 1.65, 1.66, 1.67, 1.68, 1.69, 1.70, 1.71, 1.72, 1.73, 1.74, 1.75, 1.76, 1.77, 1.78, 1.79, 1.80, 1.81, 1.82, 1.83, 1.84, 1.85, 1.86, 1.87, 1.88, 1.89, 1.90, 1.91, 1.92, 1.93, 1.94, 1.95, 1 .96, 1.97, 1.98, 1.99, or 2.00, etc.; b / m can be 1.00, 1.01, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.10, 1.11, 1.12, 1.13, 1.14, 1.15, 1.16, 1.17, 1.18, 1.19, 1.20, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28, 1.29, 1.30, 1.31, 1.32, 1.33, 1.34, 1.35, 1.36, 1.37, 1.38, 1.39, or 1.40, etc.

[0078] Optionally, please refer to Figure 3 and Figure 4 In some embodiments, the nominal diameter m of the screw connector 200 is 8 mm, the major axis dimension a of the elliptical hole 4a is 13 mm, the minor axis dimension b of the elliptical hole 4a is 9 mm, the front-to-back upward dimension L of the elliptical hole 4a is 14 mm, the radius r of the arc notch 5a is 1 mm, and the distance c between the position S of the mounting hole 4 and the edge 3 of the frame is 4.5 mm.

[0079] This disclosure also provides a photovoltaic module, which includes a frame 100 and a laminate (not shown in the figures), the laminate being disposed on the frame 100. Since the frame 100 adopts the technical solution of the above embodiments, it has the beneficial effects brought about by the technical solution of the above embodiments.

[0080] This disclosure also provides a photovoltaic system, please refer to [link / reference]. Figure 3 and Figure 4 In some embodiments, the photovoltaic system includes a photovoltaic module, a screw connector 200, and a mounting bracket 300. The frame 100 of the photovoltaic module is disposed on the mounting bracket 300. The tail of the screw connector 200 passes through the mounting hole 4 of the frame 100 and is threadedly connected to the mounting bracket 300. Since the photovoltaic module adopts the technical solution of the above embodiments, it has the beneficial effects brought about by the technical solution of the above embodiments.

[0081] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of this disclosure. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure should be determined by the scope defined in the claims.

Claims

1. A frame, characterized in that, The border includes a connected first frame edge and a second frame edge; The end of the first frame away from the second frame forms the edge of the frame. A mounting hole is provided through the first frame. A stress concentration formation structure is provided on the inner surface of the mounting hole. The stress concentration formation structure and the position of the inner surface of the mounting hole closest to the edge of the frame are spaced apart in the circumferential direction of the mounting hole.

2. The frame according to claim 1, characterized in that, The stress concentration forms a notch.

3. The frame according to claim 2, characterized in that, The notch is an arc-shaped notch.

4. The frame according to claim 1, characterized in that, The stress concentration formation structure is arc-shaped with a radius of r. The minimum distance between the inner surface of the mounting hole and the edge of the frame is c, where 0.2 ≤ r / c ≤ 0.

4.

5. The frame according to claim 1, characterized in that, The stress concentration forming structures are provided in multiple portions at intervals along the circumference of the mounting holes.

6. The frame according to claim 1, characterized in that, The mounting hole has the stress concentration formation structure at at least one end in a direction perpendicular to the direction from the second frame edge to the edge of the frame.

7. The frame according to claim 1, characterized in that, The mounting hole has a dimension of W in the direction from the second frame edge to the edge of the frame, and a dimension of L in the direction perpendicular to the direction from the second frame edge to the edge of the frame, where L is greater than W, so that the frame can be moved and adjusted relative to the screw inserted into the mounting hole in a direction perpendicular to the direction from the second frame edge to the edge of the frame.

8. The frame according to claim 7, characterized in that, The mounting hole is an elliptical hole.

9. The frame according to claim 8, characterized in that, The mounting hole has two stress concentration structures at each end in a direction perpendicular to the direction from the second frame edge to the edge of the frame; The major axis dimension of the elliptical hole is a, where: 1.05≤L / a≤1.

29.

10. The frame according to claim 1, characterized in that, The mounting holes are symmetrically arranged in a direction perpendicular to the direction from the second frame edge to the edge of the frame; and / or, The mounting holes are symmetrically arranged in the direction from the second frame edge to the edge of the frame.

11. A photovoltaic module, characterized in that, include: The border is the border as described in any one of claims 1-10; A laminate, the laminate being disposed on the frame.

12. A photovoltaic system, characterized in that, include: Mounting bracket; A photovoltaic module, wherein the photovoltaic module is as described in claim 11, and the frame of the photovoltaic module is disposed on the mounting bracket; A screw connector, the tail of which passes through the mounting hole of the frame and is threadedly connected to the mounting bracket.

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