Photovoltaic module

Abstract

The utility model discloses a photovoltaic assembly, which comprises a frame, a plurality of battery strings, a first bus bar and a plurality of diodes, the plurality of battery strings are arranged in the frame, the plurality of battery strings extend along a first direction and are arranged at intervals along a second direction, and the first direction is perpendicular to the second direction. The first bus bar extends in the second direction and penetrates through the frame, the first bus bar is electrically connected with the battery strings located between the two ends of the multiple battery strings, the multiple diodes comprise a main diode and a secondary diode, the main diode is connected to the middle of the first bus bar, and the secondary diode is connected to the end of the first bus bar and located on the outer side of the frame; and the conduction directions of the secondary diode and the main diode are opposite to the current direction of the first bus bar. By means of the arrangement, bubbles can be prevented from being generated in the center of the photovoltaic module, an adhesive film in the photovoltaic module can be prevented from overflowing from the open hole of the double-sided glass, adhesive tape does not need to be placed at the open hole, and therefore the assembling steps of the photovoltaic module and materials can be saved.

Description

Technical Field

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

[0002] Currently, when photovoltaic modules use double-sided glass, three round or U-shaped holes need to be opened on one side of the glass. The busbars pass through the three round or U-shaped holes respectively. This will cause air bubbles to form in the center of the photovoltaic module, which will cause the photovoltaic module to crack at the location of the busbars. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a photovoltaic module that avoids glass openings while still ensuring the function of the busbars and diodes, thereby preventing the formation of air bubbles in the photovoltaic module, thus guaranteeing its performance and extending its service life.

[0004] The photovoltaic module according to this utility model includes: a frame, a plurality of battery strings, a first busbar, and a plurality of diodes. The plurality of battery strings are disposed in the frame and extend along a first direction and are spaced apart along a second direction. The first direction and the second direction are perpendicular. The first busbar extends in the second direction and passes through the frame. The first busbar is electrically connected to the battery strings located between the two ends of the plurality of battery strings. The plurality of diodes include: a main diode and a secondary diode. The main diode is connected to the middle of the first busbar, and the secondary diode is connected to the end of the first busbar and located outside the frame. The conduction directions of the secondary diode and the main diode are opposite to the current direction of the first busbar.

[0005] According to the photovoltaic module of this utility model, by passing a first busbar through the frame in a second direction and electrically connecting the first busbar to the battery strings located between the two ends of multiple battery strings, the first busbar can be avoided from passing through the double-sided glass, thereby preventing air bubbles from forming in the center of the photovoltaic module and preventing the encapsulant film in the photovoltaic module from overflowing from the openings in the double-sided glass. This also eliminates the need to place adhesive tape at the openings, thus saving assembly steps and materials. The main diode is connected to the middle of the first busbar, and the secondary diode is connected to the end of the first busbar. The conduction directions of both the secondary and main diodes are opposite to the current direction of the first busbar. This allows the secondary diode to be located outside the frame, and the main and secondary diodes to be connected. This ensures that when some battery strings fail, multiple diodes can conduct to the remaining battery strings, thereby guaranteeing the performance of the photovoltaic module and extending its service life.

[0006] In some examples of this invention, in the second direction, the portion of the first busbar located between two adjacent diodes is connected to at least two of the battery strings.

[0007] In some examples of this utility model, the main diode is constructed as a surface mount diode, which is attached to the first busbar.

[0008] In some examples of this invention, the surface-mount diode is integrally connected to the first busbar.

[0009] In some examples of this utility model, the photovoltaic module further includes: a second busbar extending in the second direction and used for connection to an external line, the second busbar being electrically connected to the battery strings located at the ends of the plurality of battery strings, and the first busbar and the second busbar being stacked.

[0010] In some examples of this utility model, the photovoltaic module further includes: a junction box, the junction box being disposed on the outside of the frame, the frame being provided with a through hole, the second busbar passing through the through hole and electrically connected to the junction box, so as to be connected to the external line through the junction box.

[0011] In some examples of this invention, the secondary diode is disposed inside the junction box.

[0012] In some examples of this utility model, the photovoltaic module further includes an insulating element disposed between the first busbar and the second busbar.

[0013] In some examples of this utility model, there are two secondary diodes, each connected to the end of the first busbar, and two second busbars, each electrically connected to the battery string located at the end of the plurality of battery strings.

[0014] In some examples of this utility model, in the first direction, the first busbar and the second busbar are located in the middle of the battery string; the photovoltaic module further includes: a plurality of third busbars, the plurality of third busbars being located at the ends of the battery string in the first direction, and each third busbar connecting two adjacent battery strings.

[0015] Compared with the prior art, this utility model adopts a method of passing the first busbar through the frame in the second direction and electrically connecting the first busbar to the battery strings located between the two ends of multiple battery strings. This avoids the first busbar passing through the double-sided glass, thereby preventing air bubbles from forming in the center of the photovoltaic module and preventing the encapsulant film in the photovoltaic module from overflowing from the openings in the double-sided glass. It also eliminates the need to place tape at the openings, thus saving assembly steps and materials. The main diode is connected to the middle of the first busbar, and the secondary diode is connected to the end of the first busbar. Moreover, the conduction directions of the secondary diode and the main diode are opposite to the current direction of the first busbar. This allows the secondary diode to be located on the outside of the frame, and the main diode to be connected to the secondary diode. This ensures that when some battery strings fail, multiple diodes can conduct to the remaining battery strings, thereby ensuring the performance of the photovoltaic module and extending its service life.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a partial structural schematic diagram of the photovoltaic module according to this utility model;

[0019] Figure 2 This is a partial structural schematic diagram of the photovoltaic module according to this utility model;

[0020] Figure 3 This is a circuit diagram of the photovoltaic module according to this utility model.

[0021] Figure label:

[0022] 10. Battery string; 20. First busbar; 30. Diode; 31. Main diode; 32. Secondary diode; 40. Second busbar; 50. Insulator; 60. Third busbar. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0024] The following is for reference. Figures 1-3 A photovoltaic module according to an embodiment of the present invention is described.

[0025] like Figure 1 and Figure 3As shown, the photovoltaic module according to this utility model includes: a frame, multiple battery strings 10, a first busbar 20, and multiple diodes 30. The multiple battery strings 10 are disposed in the frame, extending along a first direction and spaced apart along a second direction, the first direction and the second direction being perpendicular. The first busbar 20 extends in the second direction and passes through the frame, and is electrically connected to the battery strings 10 located between the two ends of the multiple battery strings 10. The multiple diodes 30 include: a main diode 31 and a secondary diode 32. The main diode 31 is connected to the middle of the first busbar 20, and the secondary diode 32 is connected to the end of the first busbar 20 and located outside the frame. The conduction directions of the secondary diode 32 and the main diode 31 are opposite to the current direction of the first busbar 20.

[0026] It is understandable that the frame, multiple battery strings 10, first busbar 20 and multiple diodes 30 constitute the main structure of the photovoltaic module. The multiple battery strings 10 are set in the frame, and two pieces of glass are set on the two sides of the frame respectively. This arrangement can protect the multiple battery strings 10 with the frame and glass, thereby extending the service life of the battery strings 10 and ensuring the performance of the battery strings 10. The battery strings 10 can also collect light source through the transmission and / or reflection of the glass.

[0027] Multiple battery strings 10 extend in a first direction and are spaced apart in a second direction. The first and second directions are perpendicular. For example, the multiple battery strings 10 are evenly spaced apart, and the battery strings 10 spaced apart in the second direction have opposite polarities. This ensures the efficiency of current transfer between the battery strings 10, making it easier to combine the battery strings 10 into a photovoltaic module. It also improves the ability of the battery strings 10 to absorb sunlight, thereby improving the power generation efficiency of the photovoltaic module.

[0028] The first busbar 20 extends in the second direction, and both ends of the first busbar 20 protrude through the frame. This arrangement allows the two ends of the first busbar 20 to be located outside the frame, while most of the main body of the first busbar 20 is inside the frame. The first busbar 20 passes through the middle of the battery string 10 in the first direction, which allows the first busbar 20 to be electrically connected to the battery string 10 located between the two ends of the multiple battery strings 10. This ensures the current transmission efficiency between the battery strings 10 and avoids the need to open through holes in the glass to pass through the end of the first busbar 20, thereby preventing air bubbles from forming in the center of the photovoltaic module.

[0029] In addition, the main diode 31 and the secondary diode 32 constitute the main body of the multiple diodes 30. The main diode 31 is located in the middle of the first busbar 20, and the secondary diode 32 is connected to the end of the first busbar 20. Moreover, the secondary diode 32 is located on the outside of the frame. This arrangement can avoid opening through holes in the glass to pass through the first busbar 20 and connect the secondary diode 32, thereby preventing air bubbles from forming in the center of the photovoltaic module and preventing the encapsulant film in the photovoltaic module from overflowing from the openings in the double-sided glass.

[0030] Specifically, the conduction directions of the secondary diode 32 and the primary diode 31 are opposite to the current direction of the first busbar 20. This arrangement allows the primary diode 31 to bypass the short circuit of the two adjacent battery strings 10 in the second direction after being blocked, and the secondary diode 32 to generate electricity. Alternatively, the secondary diode 32 can bypass the short circuit of the battery strings 10 after being blocked, and the primary diode 31 to generate electricity, thus ensuring the normal operation of the photovoltaic module.

[0031] Therefore, by having the first busbar 20 pass through the frame in the second direction and electrically connect it to the battery strings 10 located between the two ends of the plurality of battery strings 10, the first busbar 20 can be prevented from passing through the double-sided glass, thus preventing air bubbles from forming in the center of the photovoltaic module and preventing the encapsulant film in the photovoltaic module from overflowing from the openings in the double-sided glass. This also eliminates the need to place adhesive tape at the openings, thereby saving assembly steps and materials. The main diode 31 is connected to the middle of the first busbar 20, and the secondary diode 32 is connected to the end of the first busbar 20. The conduction directions of both the secondary diode 32 and the main diode 31 are opposite to the current direction of the first busbar 20. This allows the secondary diode 32 to be located outside the frame, and the main diode 31 to be connected to the secondary diode 32. This ensures that when some battery strings 10 fail, the multiple diodes 30 conduct to the remaining battery strings 10, thereby guaranteeing the performance of the photovoltaic module and extending its service life.

[0032] In addition, such as Figure 1 As shown, in the second direction, the portion of the first busbar 20 located between two adjacent diodes 30 is connected to at least two battery strings 10. It can be understood that the first busbar 20 connects the main diode 31 and the secondary diode 32, allowing the first busbar 20 to connect the main diode 31 and the secondary diode 32. Furthermore, this portion of the first busbar 20 connects at least two battery strings 10, which are arranged alternately with opposite polarities. This allows the first busbar 20 to connect the battery strings 10, the main diode 30, and the secondary diode 32, thereby ensuring the performance of the photovoltaic module.

[0033] Optionally, such as Figure 1As shown, the main diode 31 is constructed as a surface mount diode 30, which is mounted on the first busbar 20. This configuration not only reduces the size of the main diode 31, but also facilitates the welding of the main diode 31 and the first busbar 20 together between the cell strings 10, thereby optimizing the internal structure of the photovoltaic module. It also facilitates the mounting of the main diode 31 on the first busbar 20. Moreover, the surface mount diode 30 has the characteristics of high integration, light load negative coupling and low inductance, which makes it easier for the main diode 31 to occupy less space within the frame. It can also improve the current stability in the cell string 10, thereby improving the performance of the photovoltaic module.

[0034] In particular, such as Figure 1 As shown, the surface-mount diode 30 is integrally connected to the first busbar 20. This arrangement allows the surface-mount diode 30 to be directly connected to the first busbar 20. While ensuring the performance of both the surface-mount diode 30 and the first busbar 20, it facilitates the mounting of the glass on the frame, thereby preventing air bubbles from forming in the center of the photovoltaic module and preventing the encapsulant film in the photovoltaic module from overflowing from the openings in the double-sided glass. It also eliminates the need to place adhesive tape at the openings, thus saving assembly steps and materials. For example, the surface-mount diode 30 and the first busbar 20 can be soldered or bonded together, resulting in a more secure connection.

[0035] In addition, such as Figure 1 As shown, the photovoltaic module also includes: a second busbar 40, which extends in a second direction and is used to connect to an external line. The second busbar 40 is electrically connected to the battery strings 10 located at the ends of the plurality of battery strings 10. The first busbar 20 and the second busbar 40 are stacked together.

[0036] It is understood that the second busbar 40 extends in the second direction, so that the second busbar 40 can be stacked with the first busbar 20, thereby facilitating the connection between the first busbar 20 and the second busbar 40 to the battery string 10 and the diode 30. Moreover, one end of the second busbar 40 is connected to an external line, and the other end is connected to the battery string 10 located at the ends of the multiple battery strings 10, thereby enabling the second busbar 40 to connect the battery string 10 and the external line, thus enriching the current path of the photovoltaic module.

[0037] In addition, the photovoltaic module also includes a junction box, which is located on the outside of the frame. The frame has through holes, and the second busbar 40 passes through the through holes and is electrically connected to the junction box to connect to external lines through the junction box. That is, the junction box is located on the outside of the frame, which avoids installing it on the glass surface, thus preventing it from blocking sunlight reflection. Furthermore, the junction box's location on the outside saves space within the frame and prevents it from aging due to ultraviolet radiation. This increases the arrangement area of ​​the battery string 10, simplifies the installation process of double-sided glass, improves the photovoltaic module's current collection capacity, and reduces the cost of the photovoltaic module. The through holes on the frame allow both the first busbar 20 and the second busbar 40 to pass through, optimizing the structural arrangement of the photovoltaic module. One end of the second busbar 40 connects to external lines through the junction box, allowing the second busbar 40 to connect the battery string 10 and external lines, thereby enriching the current path of the photovoltaic module.

[0038] The secondary diode 32 is located inside the junction box, which protects the secondary diode 32, thereby extending its service life and ensuring the performance of the photovoltaic module.

[0039] In addition, such as Figure 2 As shown, the photovoltaic module also includes an insulating component 50, which is disposed between the first busbar 20 and the second busbar 40. This arrangement allows the first busbar 20 and the second busbar 40 to operate independently and without interference. This ensures that when two adjacent battery strings 10 in the second direction are blocked, the main diode 31 bypasses the short circuit between them, the second busbar 40 connects the battery strings 10, and the secondary diode 32 generates electricity. Alternatively, when a battery string 10 adjacent to the secondary diode 32 is blocked, the secondary diode 32 bypasses the short circuit, the first busbar 20 connects the battery strings 10, and the main diode 31 generates electricity, thus ensuring the normal operation of the photovoltaic module. For example, the width of the insulating component 50 is greater than the width of the first busbar 20 and the second busbar 40, ensuring complete insulation between the insulating component and the first busbar 20 and the second busbar 40, thereby guaranteeing their normal operation.

[0040] In particular, such as Figure 1 As shown, there are two secondary diodes 32, which are respectively connected to the ends of the first busbar 20, and two second busbars 40, which are respectively electrically connected to the battery strings 10 located at the ends of the plurality of battery strings 10.

[0041] It is understandable that the two secondary diodes 32 are located on both sides of the frame length direction and in the middle of the frame. The two secondary diodes 32 are arranged opposite each other. The two ends of the first busbar 20 are connected to the two secondary diodes 32 respectively. This allows the first busbar 20 to be arranged in a straight line, thereby optimizing the arrangement structure of the battery string 10, saving space in the frame, and increasing the arrangement area of ​​the battery string 10.

[0042] The two second busbars 40 correspond to two secondary diodes 32 respectively, and the second busbars 40 are electrically connected to the battery strings 10 located at the ends of the multiple battery strings 10, so that the second busbars 40 can connect the battery strings 10 and the external lines, thereby enriching the current path of the photovoltaic module.

[0043] In addition, such as Figure 1 As shown, in the first direction, the first busbar 20 and the second busbar 40 are located in the middle of the battery string 10; the photovoltaic module also includes: a plurality of third busbars 60, which are located at the ends of the battery string 10 in the first direction, and each third busbar 60 is connected between two adjacent battery strings 10.

[0044] Understandably, the first busbar 20 and the second busbar 40 are located in the middle of the battery string 10 extending in the first direction. This arrangement allows the first busbar 20 and the second busbar 40 to occupy the space in the middle of the battery string 10, thereby optimizing the structure of the photovoltaic module. It also facilitates the connection between the first busbar 20 and the second busbar 40 and the battery string 10, thus ensuring the current balance in the photovoltaic module. Multiple third busbars 60 are connected to the ends of the battery string 10 in the first direction, so that the battery string 10, the third busbars 60, the first busbar 20 and the second busbar 40 can form a complete circuit. Moreover, each third busbar 60 is connected between two adjacent battery strings 10, and the polarities of the two adjacent battery strings 10 are opposite, thereby ensuring the current transfer efficiency between the battery strings 10.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0048] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized in that, include: frame; Multiple battery strings (10) are disposed in the frame, and the multiple battery strings (10) extend along a first direction and are spaced apart along a second direction, wherein the first direction and the second direction are perpendicular; A first busbar (20) extends in the second direction and passes through the frame, and the first busbar (20) is electrically connected to the battery string (10) located between the two ends of the plurality of battery strings (10); Multiple diodes (30) are provided, including a main diode (31) and a secondary diode (32). The main diode (31) is connected to the middle of the first busbar (20), and the secondary diode (32) is connected to the end of the first busbar (20) and located outside the frame. The conduction directions of the secondary diode (32) and the main diode (31) are opposite to the current direction of the first busbar (20).

2. The photovoltaic module according to claim 1, characterized in that, In the second direction, the portion of the first busbar (20) located between two adjacent diodes (30) is connected to at least two of the battery strings (10).

3. The photovoltaic module according to claim 1, characterized in that, The main diode (31) is constructed as a surface mount diode (30), which is attached to the first busbar (20).

4. The photovoltaic module according to claim 3, characterized in that, The surface-mount diode (30) is integrally connected to the first busbar (20).

5. The photovoltaic module according to claim 1, characterized in that, Also includes: The second busbar (40) extends in the second direction and is used for connection to an external line. The second busbar (40) is electrically connected to the battery string (10) located at the end of the plurality of battery strings (10). The first busbar (20) and the second busbar (40) are stacked together.

6. The photovoltaic module according to claim 5, characterized in that, Also includes: A junction box is disposed on the outside of the frame, the frame is provided with a through hole, the second busbar (40) passes through the through hole and is electrically connected to the junction box, so as to connect to the external line through the junction box.

7. The photovoltaic module according to claim 6, characterized in that, The secondary diode (32) is disposed inside the junction box.

8. The photovoltaic module according to claim 5, characterized in that, Also includes: An insulating element (50) is disposed between the first busbar (20) and the second busbar (40).

9. The photovoltaic module according to claim 5, characterized in that, The secondary diodes (32) are two in number and are respectively connected to the ends of the first busbar (20). The second busbars (40) are two in number and are respectively electrically connected to the battery strings (10) located at the ends of the plurality of battery strings (10).

10. The photovoltaic module according to claim 5, characterized in that, In the first direction, the first busbar (20) and the second busbar (40) are located in the middle of the battery string (10); The photovoltaic module also includes: Multiple third busbars (60) are located at the ends of the battery strings (10) in the first direction, and each third busbar (60) is connected between two adjacent battery strings (10).

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