Back glass and photovoltaic module

Abstract

The utility model relates to back glass and a photovoltaic module. The back glass is provided with a lead hole, and the lead hole is used for a leading-out wire to pass through. Wherein the lead hole has a first size along the first direction and a second size along the second direction, and the first size is set to be 1.5-3 times of the second size; the first direction is the length direction of the back glass, and the second direction is the width direction of the back glass. According to the back glass and the photovoltaic module, by setting the shape and size of the lead hole, the smoothness of the opening position of the back glass can be increased, the stress concentration degree of the opening position of the back glass can be reduced, and the stress concentration phenomenon can be improved, so that the strength of the back glass is improved, and the breaking failure risk of the back glass is reduced; and the reliability of the photovoltaic module is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a back glass and a photovoltaic module. Background Art

[0002] Double-glass modules are photovoltaic modules composed of two layers of glass and solar cells, with the solar cells connected in series and parallel to the lead ends by welding strips and bus bars. During the manufacturing process of double-glass modules, due to the structural characteristics of double-glass modules, it is necessary to open holes on the back glass of the double-glass modules to facilitate the lead-out of the bus bars.

[0003] In the related art, when the back glass is subjected to external force, a large degree of stress concentration will occur at the opening position, making the back glass prone to failure at the opening position, thereby reducing the strength of the back glass and affecting the reliability of the photovoltaic module. Utility Model Content

[0004] Based on this, it is necessary to provide a back glass and a photovoltaic module to address the problem that the back glass strength is reduced due to the opening, which affects the reliability of the photovoltaic module.

[0005] In a first aspect, the present application provides a back glass, on which a lead hole is opened, and the lead hole is used to pass a lead wire; wherein the lead hole has a first dimension along a first direction and a second dimension along a second direction, and the first dimension is set to 1.5 times to 3 times the second dimension; the first direction is the length direction of the back glass, and the second direction is the width direction of the back glass.

[0006] In some embodiments, the second dimension of the lead hole is greater than 4 mm and less than or equal to 12 mm.

[0007] In some embodiments, the connection between the inner circumference of the lead hole and the surface of the back glass is chamfered or rounded.

[0008] In some embodiments, the shape of the lead hole is an ellipse, the first dimension is the major axis dimension of the ellipse, and the second dimension is the minor axis dimension of the ellipse.

[0009] In some embodiments, the shape of the lead hole is a combination of a rectangle and two semicircles connected to opposite sides of the rectangle along the first direction, the first size is the sum of the size of the rectangle along the first direction and the diameter of the semicircle, and the second size is the diameter of the semicircle.

[0010] In some embodiments, the shape of the lead hole is a combination of a rectangle and two semi-ellipses connected to opposite sides of the rectangle along the first direction, the first size is the sum of the size of the rectangle along the first direction and the major axis size of the semi-ellipse, and the second size is the minor axis size of the semi-ellipse.

[0011] In some embodiments, there are multiple lead holes; the multiple lead holes are arranged on the back glass at intervals along the second direction.

[0012] In some embodiments, the thickness of the back glass is greater than or equal to 1.6 mm and less than or equal to 3.2 mm.

[0013] In a second aspect, the present application provides a photovoltaic assembly, the photovoltaic assembly comprising: a battery string;

[0014] A front packaging film covering the front side of the battery string;

[0015] A back packaging film, covering the back of the battery string;

[0016] A front glass covering a surface of the front packaging film facing away from the battery string; and

[0017] The back glass as described in any one of the first aspects covers the surface of the back packaging film away from the battery string.

[0018] In some embodiments, the second dimension of the lead hole of the back glass is greater than the width dimension of the lead wire of the battery string.

[0019] The above-mentioned back glass and photovoltaic module, by setting the first size of the lead hole to 1.5 to 3 times the second size, can increase the flatness of the back glass opening position, reduce the stress concentration degree at the back glass opening position, improve the stress concentration phenomenon, thereby increasing the strength of the back glass and reducing the risk of back glass breakage and failure, which is beneficial to improving the reliability of the photovoltaic module and effectively alleviating the problem of the back glass strength being reduced due to the opening, thereby affecting the reliability of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the back glass of some embodiments of the present application.

[0021] Figure 2 This is a schematic diagram of the enlarged structure of the lead hole in some embodiments of the present application.

[0022] Figure 3 It is a schematic diagram of the enlarged structure of the lead holes in other embodiments of the present application.

[0023] Figure 4Schematic diagram of the enlarged structure of the lead holes in some other embodiments of the present application.

[0024] Figure 5 This is a partial cross-sectional view of the back glass of some embodiments of the present application.

[0025] Figure 6 Partial cross-sectional views of the back glass of some other embodiments of the present application.

[0026] Figure 7 This is a schematic diagram of the structure of photovoltaic modules according to some embodiments of the present application.

[0027] Figure 8 This is a schematic diagram of the structure in which the lead wires of some embodiments of the present application are passed through the lead wire holes.

[0028] Figure Number:

[0029] 100. Photovoltaic module; 10. Back glass; 11. Lead hole; 20. Battery string; 21. Lead wire; 30. Front encapsulation film; 40. Back encapsulation film; 50. Front glass. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. An element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and are not intended to be the only implementation method.

[0036] With the development of photovoltaic technology, more and more countries and regions use photovoltaic systems to generate electricity. Photovoltaic modules are the core units of photovoltaic systems, and the reliability of photovoltaic modules directly affects the power generation efficiency of photovoltaic systems.

[0037] Double-glass modules are photovoltaic modules composed of two layers of glass and solar cells, with the solar cells connected in series and parallel to the lead ends by welding strips and bus bars. During the manufacturing process of double-glass modules, due to the structural characteristics of double-glass modules, it is necessary to open holes on the back glass of the double-glass modules to facilitate the lead-out of the bus bars.

[0038] In the related art, when the back glass is subjected to external force, stress concentration will occur at the opening position, especially when the opening of the back glass is a circular hole. A large degree of stress concentration will occur at the circular hole position, making the back glass easy to break and fail at the opening position, thereby reducing the strength of the back glass and increasing the risk of failure of the back glass, affecting the reliability of the photovoltaic module.

[0039] See also Figures 1 to 4 , Figure 1 Schematic diagram of the structure of the back glass in some embodiments of the present application is shown. Figure 2 shows an enlarged structural schematic diagram of the lead hole in some embodiments of the present application, Figure 3 FIG. 1 shows an enlarged structural schematic diagram of the lead hole in some other embodiments of the present application. Figure 4 An enlarged structural schematic diagram of the lead hole in some other embodiments of the present application is shown; the embodiment of the present application provides a back glass 10, on which a lead hole 11 is opened, and the lead hole 11 is used to pass the lead wire; wherein the lead hole 11 has a first dimension L1 along the first direction and a second dimension L2 along the second direction, and the first dimension L1 is set to 1.5 times to 3 times the second dimension L2; the first direction is the length direction of the back glass 10, and the second direction is the width direction of the back glass 10.

[0040] like Figures 1 to 4 As shown in , the X direction is the first direction, the Y direction is the second direction, and the X direction and the Y direction are perpendicular to each other.

[0041] The back glass 10 is used to be arranged on the backlight side of the photovoltaic module to protect the internal packaging materials and solar cells of the photovoltaic module from mechanical damage and external environmental erosion, and to prevent water vapor and insulation; the back glass 10 can be transparent or opaque glass; the back glass 10 can be rolled glass or float glass, which is not limited here. The lead wire refers to the external wire that is electrically connected to the solar cell inside the photovoltaic module and passes through the photovoltaic module to the outside. The electrical energy generated by the photovoltaic module is output through the lead wire. A lead hole 11 is opened on the back glass 10 so that the lead wire can be passed through the lead hole 11 when the photovoltaic module is manufactured. The lead hole 11 can be opened on the back glass 10 by laser drilling, or the lead hole 11 can be opened on the back glass 10 by other methods, which is not limited here.

[0042] Among them, the first dimension L1 of the lead hole 11 along the first direction is 1.5 to 3 times the second dimension L2 along the second direction, that is, L1=1.5L2~3L2; since the first direction is the length direction of the back glass 10, that is, the first dimension L1 of the lead hole 11 is the dimension along the length direction of the back glass 10; the second direction is the width direction of the back glass 10, that is, the second dimension L2 of the lead hole 11 is the dimension along the width direction of the back glass 10. Therefore, different from the circular hole, the lead hole 11 is in a special shape in which the dimension along the length direction of the back glass 10 is larger than the dimension along the width direction of the back glass 10, and the dimension along the length direction of the back glass 10 is 1.5 to 3 times the dimension along the width direction of the back glass 10, so that the position of the lead hole 11 is smoother, which can significantly reduce the stress concentration degree at the position of the lead hole 11, improve the stress concentration phenomenon, improve the strength of the back glass 10, and reduce the occurrence of the back glass 10 breakage failure phenomenon.

[0043] The back glass 10 of the embodiment of the present application can increase the flatness of the opening position of the back glass 10 by setting the first size L1 of the lead hole 11 to 1.5 to 3 times the second size L2, reduce the stress concentration degree at the opening position of the back glass 10, improve the stress concentration phenomenon, thereby increasing the strength of the back glass 10, reducing the risk of breakage and failure of the back glass 10, and further helping to improve the reliability of the photovoltaic module, and effectively alleviating the problem that the opening causes the strength of the back glass 10 to decrease and affects the reliability of the photovoltaic module.

[0044] In some embodiments, the second dimension L2 of the lead hole 11 is greater than 4 mm and less than or equal to 12 mm.

[0045] The size of the lead hole 11 is related to the size of the lead wire. In the related art, the maximum size of the lead wire in the direction perpendicular to its extension is about 4 mm. By setting the second size L2 of the lead hole 11 to be greater than 4 mm, it is convenient to pass the lead wire through the lead hole 11. At the same time, it can be understood that the larger the opening area on the back glass 10, the lower the strength of the back glass 10. By setting the second size L2 of the lead hole 11 to be less than or equal to 12 mm, it is beneficial to reduce the opening area on the back glass 10 while facilitating the lead wire to pass through the lead hole 11, thereby improving the strength of the back glass 10, reducing the risk of breakage and failure of the back glass 10, and improving the reliability of the photovoltaic module.

[0046] In some embodiments, see Figure 2 The shape of the lead hole 11 is an ellipse, the first dimension L1 is the major axis dimension of the ellipse, and the second dimension L2 is the minor axis dimension of the ellipse.

[0047] The lead hole 11 may be an elliptical hole, for example, the major axis size of the ellipse may range from 12 mm to 18 mm, and the minor axis size may range from 4 mm to 12 mm, that is, the first size L1 of the lead hole 11 ranges from 12 mm to 18 mm, and the second size L2 ranges from 4 mm to 12 mm. By setting the lead hole 11 as an elliptical hole, the stress concentration at the opening position can be reduced, the strength of the back glass 10 can be improved, and the reliability of the photovoltaic module can be further improved.

[0048] In other embodiments, see Figure 3 The shape of the lead hole 11 is a combination of a rectangle and two semicircles connected to opposite sides of the rectangle along the first direction. The first dimension L1 is the sum of the dimension of the rectangle along the first direction and the diameter of the semicircle, and the second dimension L2 is the diameter of the semicircle.

[0049] The lead hole 11 may also be a rectangular-circular combination hole, that is, the shape of the lead hole 11 is a combination of a rectangle and two semicircles connected to opposite sides of the rectangle along the first direction; it should be noted that the rectangle and the semicircle here are the shapes obtained by segmenting the outline of the lead hole 11, such as Figure 3 As shown in the figure, the rectangle and the two semicircles on both sides are separated by dotted lines. For example, the size of the rectangle along the first direction can be 6 mm, the size along the second direction can be 12 mm, and the diameter of the semicircle can be 12 mm, so that the first size L1 of the lead hole 11 is 18 mm, and the second size L2 is 12 mm. By setting the lead hole 11 as a rectangular-circular combination hole, the stress concentration at the opening position can be reduced, the strength of the back glass 10 can be improved, and the reliability of the photovoltaic module can be further improved.

[0050] In some other embodiments, see Figure 4 The shape of the lead hole 11 is a combination of a rectangle and two semi-ovals connected to opposite sides of the rectangle along the first direction. The first dimension L1 is the sum of the dimension of the rectangle along the first direction and the major axis dimension of the semi-oval, and the second dimension L2 is the minor axis dimension of the semi-oval.

[0051] The lead hole 11 may also be a rectangular-elliptical combination hole, that is, the shape of the lead hole 11 is a combination of a rectangle and two semi-ellipses connected to opposite sides of the rectangle along the first direction; it should be noted that the rectangle and the semi-ellipses here are the graphics obtained by segmenting the outline of the lead hole 11, such as Figure 4As shown, the rectangle and the two semi-ovals on both sides are separated by dotted lines. For example, the size of the rectangle along the first direction can be 6 mm, the size along the second direction can be 12 mm, the major axis size of the semi-oval can be 18 mm, and the minor axis size can be 12 mm, so that the first size L1 of the lead hole 11 is 24 mm, and the second size L2 is 12 mm. By setting the lead hole 11 as a rectangular-oval combination hole, the stress concentration at the opening position can be reduced, the strength of the back glass 10 can be improved, and the reliability of the photovoltaic module can be further improved.

[0052] In the above embodiment, the lead hole 11 on the back glass 10 is designed as an elliptical hole, a rectangular-circular combination hole or a rectangular-elliptical combination hole; through stress analysis, the maximum stress value of the stress distribution corresponding to different opening shapes can be obtained, among which the circular hole is 48.472MPa, the elliptical hole is 39.426MPa, the rectangular-circular combination hole is 42.06MPa, and the rectangular-elliptical combination hole is 36.102MPa. Therefore, the back glass 10 of the embodiment of the present application can reduce the stress concentration at the opening position, improve the strength of the back glass 10, and further improve the reliability of the photovoltaic module.

[0053] In some embodiments, see Figure 5 and Figure 6 , Figure 5 A partial cross-sectional view of the back glass in some embodiments of the present application is shown. Figure 6 A partial cross-sectional view of the back glass in some other embodiments of the present application is shown, where the inner circumference of the lead hole 11 and the surface of the back glass 10 are connected by a chamfered transition or a rounded transition.

[0054] like Figure 5 and Figure 6 As shown in , the Z direction is the thickness direction of the rear glass 10 .

[0055] By chamfering or rounding the junction between the lead hole 11 and the two side surfaces of the back glass 10, the chipping and breakage phenomenon that is prone to occur at the right-angle edge is improved, which is beneficial to further reduce the stress concentration at the position of the lead hole 11, improve the strength of the back glass 10, and reduce the risk of breakage and failure of the back glass 10, which is beneficial to improve the reliability of the photovoltaic module.

[0056] In some embodiments, see Figure 5 and Figure 6 The thickness dimension H of the back glass 10 is greater than or equal to 1.6 mm and less than or equal to 3.2 mm.

[0057] For example, the thickness dimension H of the back glass 10 can be 1.6 mm, 1.8 mm, 2 mm or 3.2 mm. The thickness dimension H of the back glass 10 can be set according to actual needs, which is convenient and flexible to use, meets actual needs, and has a wide range of applications; and due to the structural design of the lead hole 11, the flatness of the opening position of the back glass 10 can be increased, the stress concentration at the opening position of the back glass 10 can be reduced, and the strength of the back glass 10 can be effectively improved, which is conducive to reducing the thickness of the back glass 10 on the basis of ensuring the strength of the back glass 10, thereby improving the light transmittance of the back glass 10.

[0058] In some embodiments, see Figure 1 , there are multiple lead holes 11; the multiple lead holes 11 are arranged on the back glass 10 at intervals along the second direction.

[0059] For example, the number of lead holes 11 can be two, three, four, or more; the plurality of lead holes 11 are arranged on the back glass 10 at intervals along the second direction, that is, the back glass 10 is provided with a plurality of lead holes 11 at intervals along the width direction. By providing a plurality of lead holes 11, during the production of photovoltaic modules, a plurality of lead wires can be passed through the plurality of lead holes 11, and the electrical energy generated by the photovoltaic modules can be outputted by the plurality of lead wires, which is beneficial to improving the output power of the photovoltaic modules.

[0060] Based on the same inventive concept, see Figure 7 , Figure 7 A schematic diagram of the structure of a photovoltaic module in some embodiments of the present application is shown. The embodiments of the present application also provide a photovoltaic module 100, which includes a battery string 20, a front packaging film 30, a back packaging film 40, a front glass 50 and a back glass 10 provided by any of the above embodiments, wherein the front packaging film 30 covers the front side of the battery string 20; the back packaging film 40 covers the back side of the battery string 20; the front glass 50 covers the surface of the front packaging film 30 facing away from the battery string 20; and the back glass 10 covers the surface of the back packaging film 40 facing away from the battery string 20.

[0061] like Figure 7 As shown in , the Z direction is the thickness direction of the photovoltaic component 100 .

[0062] The front glass 50, the front encapsulation film 30, the battery string 20, the back encapsulation film 40 and the back glass 10 are stacked in sequence along the thickness direction of the photovoltaic module 100; the front side of the photovoltaic module 100 is the side of the photovoltaic module 100 facing the sunlight, and the back side of the photovoltaic module 100 is the side of the photovoltaic module 100 facing away from the sunlight. The front glass 50 can be a photovoltaic glass with a high light transmittance (light transmittance of more than 92%), such as double-coated glass; the front glass 50 and the back glass 10 protect the internal packaging materials and solar cells from mechanical damage and external environmental erosion, and are waterproof and insulated. The front encapsulation film 30 and the back encapsulation film 40 can be ethylene-vinyl acetate copolymer (EVA) film, polyolefin elastomer (POE) film or polyvinyl butyral film (PVB) film, etc. The front encapsulation film 30 and the back encapsulation film 40 are used to encapsulate and protect the solar cell to prevent the external environment from affecting the performance of the solar cell, and at the same time bond the glass and the solar cell together, and have a certain bonding strength. The battery string 20 may be one or more; if there are more than one battery string 20, the multiple battery strings 20 may be connected in series, in parallel or in mixed connection, wherein the mixed connection means that the multiple battery strings 20 are both connected in series and in parallel, and can provide higher voltage and capacity; each battery string 20 includes multiple solar cells connected in series through connectors such as welding strips, one end of the bus bar is connected to the solar cell, and the other end is connected to the lead wire, which is led out from the lead wire hole 11 opened on the back glass 10 and connected to the junction box, and the electric energy generated by the photovoltaic module 100 is led out and connected to the external load through the junction box; the solar cell may be a P-type or N-type solar cell, for example, a PERC (Passivated Emitter and Rear Cell) cell, a TOPCon (Thin Oxide Passivated Contact cell), an HJT (Heterojunction Technology) cell, an IBC (Interdigitated back contact) cell or a perovskite cell, etc.

[0063] The photovoltaic module 100 connects single crystalline silicon solar cells in series and parallel, packages them, and connects external wires to become a solar cell module that can be used independently as a photovoltaic power source; the solar cell module absorbs sunlight and uses the photovoltaic effect to directly convert solar radiation energy into the electrical energy output required by the user.

[0064] Since the photovoltaic module 100 has the same beneficial effects as the back glass 10 , they will not be described in detail here.

[0065] In some embodiments, see Figure 8 , Figure 8 A schematic diagram of the structure in which the lead wires in some embodiments of the present application are passed through the lead holes is shown, and the second dimension L2 of the lead hole 11 of the back glass 10 is larger than the width dimension L3 of the lead wires 21 of the battery string 20 .

[0066] The cross-sectional shape of the lead wire 21 can be rectangular, triangular, circular or elliptical, without limitation here; the cross-sectional shape of the lead wire 21 refers to the cross-sectional shape perpendicular to the extension direction of the lead wire 21. The lead hole 11 on the back glass 10 can be used for one or more lead wires 21 to pass through, for example, two, three, etc., without limitation here. By setting the second dimension L2 of the lead hole 11 to be larger than the width dimension L3 of the lead wire 21, it is convenient to pass the lead wire 21 through the lead hole 11; in addition, when multiple lead wires 21 pass through the lead hole 11, the width direction of the lead wire 21 can be made parallel to the second direction, which is beneficial to increase the spacing distance between the multiple lead wires 21 and avoid contact between lead wires 21 with opposite polarities to cause a short circuit.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A back glass, characterized in that: The back glass is provided with a lead hole, and the lead hole is used to pass the lead wire; Wherein, the lead hole has a first size along the first direction and a second size along the second direction, and the first size is set to be 1.5 times to 3 times the second size; The first direction is a length direction of the rear glass, and the second direction is a width direction of the rear glass.

2. The back glass according to claim 1, characterized in that: The second dimension of the lead hole is greater than 4 mm and less than or equal to 12 mm.

3. The back glass according to claim 1, characterized in that: The connection between the inner circumference of the lead hole and the surface of the back glass is chamfered or rounded.

4. The back glass according to claim 1, characterized in that: The lead hole is in an ellipse shape, the first dimension is the major axis dimension of the ellipse, and the second dimension is the minor axis dimension of the ellipse.

5. The back glass according to claim 1, characterized in that: The shape of the lead hole is a combination of a rectangle and two semicircles connected to opposite sides of the rectangle along the first direction, the first size is the sum of the size of the rectangle along the first direction and the diameter of the semicircle, and the second size is the diameter of the semicircle.

6. The back glass according to claim 1, characterized in that: The shape of the lead hole is a combination of a rectangle and two semi-ellipses connected to opposite sides of the rectangle along the first direction, the first size is the sum of the size of the rectangle along the first direction and the major axis size of the semi-ellipses, and the second size is the minor axis size of the semi-ellipses.

7. The back glass according to any one of claims 1 to 6, characterized in that: There are a plurality of lead holes; the plurality of lead holes are arranged on the back glass at intervals along the second direction.

8. The back glass according to any one of claims 1 to 6, characterized in that: The thickness of the back glass is greater than or equal to 1.6 mm and less than or equal to 3.2 mm.

9. A photovoltaic module, characterized in that: The photovoltaic module comprises: Battery string; A front packaging film covering the front side of the battery string; A back packaging film, covering the back of the battery string; A front glass covering a surface of the front packaging film facing away from the battery string; and The back glass according to any one of claims 1 to 8, covering the surface of the back packaging film facing away from the battery string.

10. The photovoltaic module according to claim 9, characterized in that: The second dimension of the lead wire hole of the rear glass is greater than the width dimension of the lead wire of the battery string.

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