Photovoltaic module

Abstract

The embodiment of the present disclosure relates to the photovoltaic field, and provides a photovoltaic module, which comprises: a cell string with opposite first and second surfaces; a busbar located on the side of the first surface away from the second surface, electrically connected to a plurality of solder strips in the cell string; a cover plate covering the surface of the cell string and the busbar, provided with an opening; a lead-out part comprising an access section, an extension section and an exit section, the extension section is inclined relative to the first direction and passes through the opening, the extension section is connected to the access section and the exit section at both ends respectively, the access section is connected to the busbar, and the exit section is connected to a junction box; two lead-out parts electrically connected to the same junction box form a lead-out group, one of the two extension sections of a single lead-out group extends in the second direction, and the other extends in the third direction; and the junction box comprises a diode mounting area and two lead-out ports, the two lead-out ports are located on the opposite sides of the diode mounting area and are arranged in a direction perpendicular to the second direction, and at least the structural stability of the photovoltaic module is improved.

Description

[0001] Cross-references to related applications

[0002] This application is a divisional application of Chinese invention patent application filed on January 7, 2025, with application number 202510025500.9 and invention title "Photovoltaic Module". Technical Field

[0003] This disclosure relates to the photovoltaic field, and in particular to a photovoltaic module. Background Technology

[0004] Currently, with the gradual depletion of fossil fuels, photovoltaic (PV) cells are becoming increasingly widely used as a new energy alternative. A PV cell is a device that converts solar energy into electrical energy. A PV junction box is a connecting device between the PV array (composed of PV modules) and the solar charging control device. Its main functions are to connect and protect the PV modules, connect the electricity generated by the PV cells to external power lines, and conduct the current generated by the PV modules.

[0005] However, the current mainstream method for connecting busbars to junction boxes involves designing lead wires on the busbars, which then pass through a cover plate and make contact with the junction box. This connection process requires bending the lead wires protruding from the opening and pressing them down with external force to weld them to the conductive components inside the junction box under high temperatures. This can easily lead to significant bending of the lead wires, affecting the connection strength between the lead wires and the conductive components in the junction box, and increasing the pressure on the cover plate. All of these factors can negatively impact the structural stability of the back-contact photovoltaic modules. Summary of the Invention

[0006] This disclosure provides a photovoltaic module that at least helps to improve the structural stability of the photovoltaic module.

[0007] According to some embodiments of this disclosure, one aspect of this disclosure provides a photovoltaic module, including: a battery string having a first surface and a second surface opposite to each other along a first direction, the first direction being the thickness direction of the battery string; a busbar located on the side of the first surface away from the second surface, electrically connected to a plurality of solder strips in the battery string; a cover plate having an opening located on the surface of the battery string and the busbar; a lead-out portion and a junction box, the lead-out portion including an access section, an extension section and an exit section, the extension section passing through the opening at an angle relative to the first direction, the two ends of the extension section being respectively connected to the access section and the exit section, the access section being connected to the busbar, and the exit section being connected to the junction box; Two leads electrically connected to the same junction box constitute a lead group. Two busbars electrically connected to a single lead group are a first busbar and a second busbar, respectively. One of the two extension segments in a single lead group extends obliquely in a second direction, and the other extends obliquely in a third direction. The second direction is the direction from the first busbar to the second busbar, and the third direction is opposite to the second direction. The junction box includes a diode mounting area for mounting diodes and two spaced-apart outlets. The two outlets are located on opposite sides of the diode mounting area and are spaced apart along a direction perpendicular to the second direction.

[0008] In some embodiments, two battery strings electrically connected to a single lead-out group each have lead-out edge regions, the two lead-out edge regions being adjacent along the arrangement direction of the battery strings, and the outlet being located on a region of the battery string other than the lead-out edge regions.

[0009] In some embodiments, the width of the lead-out edge region along the arrangement direction of the battery string is greater than or equal to 15 mm.

[0010] In some embodiments, the distance between the two outlets inside the junction box is 0.8 mm to 2 mm along a direction perpendicular to the second direction.

[0011] In some embodiments, in a single lead-out group, two leads pass through the same opening in the cover plate, or two leads pass through two different openings in the cover plate.

[0012] In some embodiments, in a single lead-out group, two leads pass through the same opening on the cover plate, and the width of the opening is greater than or equal to the sum of the widths of the two busbars and the spacing between the two busbars in a direction perpendicular to the second direction.

[0013] In some embodiments, in a single lead-out group, two lead-out portions pass through two different openings on the cover plate, and the width of the openings is greater than or equal to the width of a single busbar in a direction perpendicular to the second direction.

[0014] In some embodiments, the width of the busbar is 10mm to 12mm in a direction perpendicular to the extension direction of the busbar.

[0015] In some embodiments, the junction box covers at least one opening on the cover plate; the photovoltaic module further includes: a sealant located between the edges of the junction box and the cover plate.

[0016] In some embodiments, the extension direction of the busbar is the second direction, or the extension direction of the busbar is perpendicular to the second direction.

[0017] In some embodiments, in a single lead-out group, the angle between the extension direction of one extension segment and the second direction is less than 1°, and / or the angle between the extension direction of another extension segment and the third direction is less than 1°.

[0018] In some embodiments, the thickness of the cover plate along the first direction is greater than or equal to 1 mm.

[0019] In some embodiments, in two busbars electrically connected to a single lead-out group, the spacing between adjacent busbars is greater than 5 mm.

[0020] The technical solutions provided in this disclosure have at least the following advantages: In the design of a single lead-out group, one of the two extension segments extends inclinedly in a second direction, while the other extends inclinedly in a third direction. Two busbars electrically connected to the single lead-out group are arranged alternately along a direction perpendicular to the second direction, resulting in staggered and spaced extensions. This prevents the lead-out section from extending to the closest area in the junction box, instead extending to a more distant area. This allows for a longer extension space in the lead-out section, avoiding bends of less than or equal to 90° and effectively preventing folding back. This reduces the degree of bending and the resulting height difference, reducing the pressure exerted on the cover plate and thus lowering the risk of cell edge cracking in the battery string, thereby improving the structural stability of the photovoltaic module. Furthermore, the elimination of folding back also enhances the connection strength between the lead-out section and conductive components within the junction box, reducing the risk of poor contact between the busbars and the junction box. Furthermore, the design of the two outlets in the junction box being spaced apart and matched one-to-one with the two extensions in a single outlet group helps to avoid the need for the extensions to be bent again to match the position of the outlets in the junction box. This improves the compatibility between the outlet group and the junction box, and also ensures that the outlets do not extend to the outlets in the junction box that are closest to them, but rather to the outlets in the junction box that are farther away from them, thus allowing for a longer extension space for the extensions. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a partial cross-sectional schematic diagram of a photovoltaic module equipped with a junction box; Figure 2 This is a partial top view of a junction box; Figure 3 This is a partial cross-sectional schematic diagram of a photovoltaic module provided in an embodiment of the present disclosure; Figure 4 A three-dimensional structural diagram of a set of lead-out groups in a photovoltaic module provided in an embodiment of the present disclosure; Figure 5 This is a partial three-dimensional structural diagram of a junction box in a photovoltaic module provided in an embodiment of the present disclosure; Figure 6 This is a three-dimensional structural diagram of a combination of a junction box and a lead-out portion in a photovoltaic module according to an embodiment of the present disclosure. Figure 7 This is another partial cross-sectional schematic diagram of a photovoltaic module provided in an embodiment of the present disclosure; Figure 8 A schematic diagram of a combined three-dimensional structure of a busbar and lead-out portion in a photovoltaic module provided in an embodiment of the present disclosure; Figure 9 This is a schematic diagram of another combination of busbars and lead-out portions in a photovoltaic module provided in an embodiment of the present disclosure. Detailed Implementation

[0023] As can be seen from the background technology, the structural stability of photovoltaic modules needs to be improved.

[0024] Analysis revealed that, reference Figure 1 and Figure 2 Currently, when the busbar 10 is electrically connected to the junction box 20, based on the internal design of the junction box 20, the outlet 40 for connecting the lead wire 30 on the busbar 10 is located on both sides opposite the diode. When the lead wire 30 passes through the opening 60 in the cover plate 50, it will undergo a first bend. It will also undergo a second bend when it enters the junction box 20 from the outlet 40 and reaches the terminal of the diode. The back bend of the lead wire 30 results in a large height difference. If the photovoltaic module is subjected to excessive force or used for a long time, it is easy for the edge of the cell, i.e. the back bend of the lead wire 30, to crack.

[0025] in, Figure 1 This is a partial cross-sectional schematic diagram of a photovoltaic module equipped with a junction box. Figure 2 This is a partial top view of a junction box. To clearly illustrate the connection of the lead wire 30 into the junction box 20, Figure 1 Only the external outline of the junction box 20 is shown; the components inside the junction box 20 are not shown. To clearly illustrate the positional relationship between the lead-outlet 40 and the diode body 70 inside the junction box 20, Figure 2 The diagram only shows the outlet 40 and diode body 70 inside the junction box 20, and does not show other components inside the junction box 20.

[0026] and, Figure 2 In the junction box 20 shown, based on the positional relationship between the lead-out outlet 40 and the diode body 70, i.e., the two lead-out outlets 40 are located on opposite sides of the diode body 70, the lead wires 30 can only be... Figure 1The lead wire 30 bends back in the direction it faces, resulting in a significant degree of bending. Furthermore, two layers of lead wire 30 are stacked on the cover plate 50 in the same vertical direction, which makes the lead wire 30 prone to microcracks and puts considerable pressure on the photovoltaic module.

[0027] This disclosure provides a photovoltaic module designed with two extension segments in a single lead-out group, one extending at an angle towards a second direction and the other at an angle towards a third direction. Two busbars electrically connected to the single lead-out group are arranged at intervals along a direction perpendicular to the second direction, causing the two extension segments in the single lead-out group to extend alternately and at intervals. In this way, the lead-out portion does not extend to the area closest to it in the junction box, but rather to an area farther away from it. This facilitates increasing the extension space of the extension segment in the lead-out portion, avoiding bending of the lead-out portion less than or equal to 90°, effectively preventing the lead-out portion from folding back, thus effectively reducing the degree of bending of the lead-out portion itself. This avoids the height difference caused by the lead-out portion folding back, reducing the pressure exerted by the lead-out portion on the cover plate, thereby reducing the risk of cell edge cracking in the cell string and improving the structural stability of the photovoltaic module. Furthermore, the elimination of folding back in the lead-out portion also helps to improve the connection strength between the lead-out portion and the conductive components in the junction box, reducing the risk of poor contact between the busbars and the junction box.

[0028] In the description of the embodiments of this disclosure, 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 or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0029] 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 disclosure. 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.

[0030] In the description of the embodiments of this disclosure, 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. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In the description of embodiments of this disclosure, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0032] In the description of the embodiments of this disclosure, 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" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure 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. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0033] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0034] In the accompanying drawings corresponding to the embodiments of this disclosure, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "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.

[0035] In the description of embodiments of this disclosure, when a component "includes" another component, other components are not excluded unless otherwise stated, and may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly" on the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Additionally, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0036] 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.

[0037] 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 embodiments. However, the technical solutions claimed in the embodiments of this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0038] This disclosure provides a photovoltaic module according to one embodiment. The photovoltaic module provided by this disclosure will be described in detail below with reference to the accompanying drawings.

[0039] Reference Figure 3 and Figure 4The photovoltaic module includes: a battery string 100 composed of multiple photovoltaic cells connected together, the battery string 100 having a first surface 110 and a second surface 120 opposite each other along a first direction X, the first direction X being the thickness direction of the battery string 100; a busbar 101 electrically connected to multiple solder strips 130 in the battery string 100, and the busbar 101 being located on the side of the first surface 110 away from the second surface 120; a cover plate 102 for covering the surfaces of the battery string 100 and the busbar 101, the cover plate 102 having an opening 112; a lead-out portion 103 and a junction box 104, the lead-out portion 103 including an access section 113, an extension section 123 and a termination section 133, the extension section 123 passing through the opening 112 at an angle relative to the first direction X, and the two ends of the extension section 123 being connected to the access section 113 and the junction box 104 respectively. The output section 133 and the input section 113 are connected to the bus bar 101, and the output section 133 is connected to the junction box 104. Among them, the two leads 103 electrically connected to the same junction box 104 form a lead group 13. The two bus bars 101 electrically connected to a single lead group 13 are the first bus bar 101a and the second bus bar 101b, respectively. One of the two extension sections 123 in a single lead group 13 extends obliquely in the second direction Y1, and the other extends obliquely in the third direction Y2. The second direction Y1 is the direction from the first bus bar 101a to the second bus bar 101b, and the third direction Y2 is the direction from the second bus bar 101b to the first bus bar 101a. The two bus bars 101 electrically connected to a single lead group 13 are arranged at intervals along the direction perpendicular to the second direction Y1.

[0040] in, Figure 3 This is a partial cross-sectional schematic diagram of a photovoltaic module provided in an embodiment of the present disclosure. Figure 4 This is a three-dimensional structural diagram of a set of lead-out groups in a photovoltaic module according to an embodiment of this disclosure. It should be noted that... Figure 3 The two leads 103 in a lead-out group 13 are indicated by thicker black solid lines. Figure 4 The lead-out section 103 is divided into the access section 113, the extension section 123, and the output section 133 by dashed lines. Furthermore, the direction perpendicular to the second direction Y1 can be considered as... Figure 4 The fourth direction Z is shown in the diagram.

[0041] It is worth noting that in the design of a single lead-out group 13, one of the two extension segments 123 extends obliquely in the second direction Y1, and the other extends obliquely in the third direction Y2. The second direction Y1 is the direction from the first busbar 101a to the second busbar 101b, and the third direction Y2 is the direction from the second busbar 101b to the first busbar 101a. That is, the two extension segments 123 in the single lead-out group 13 extend alternately in the direction of inclination relative to the vertical direction.

[0042] In other words, the two extension segments 123 in a single lead-out group 13 are divided into a first extension segment 123a and a second extension segment 123b. The busbar 101 connected to the first extension segment 123a is the first busbar 101a, and the busbar 101 connected to the second extension segment 123b is the second busbar 101b. The first extension segment 123a extends obliquely in the direction from the first busbar 101a to the second busbar 101b, and the second extension segment 123b extends obliquely in the direction from the second busbar 101b to the first busbar 101a.

[0043] Furthermore, the two busbars 101 electrically connected to the single lead-out group 13 are arranged at intervals along the direction perpendicular to the second direction Y1. The two lead-out portions 103 in the single lead-out group 13, which are respectively connected to the two busbars 101, are also arranged at intervals. Thus, the two extension segments 123 in the single lead-out group 13 will not interfere with each other when they extend. Moreover, the two extension segments 123 in the single lead-out group 13 extend alternately in a direction inclined relative to the vertical direction. In this way, the lead-out portion 103 does not extend to the area closest to it in the junction box, but extends to the area farther away in the junction box. This helps to increase the extension space of the extension section 123 in the lead-out portion 103, avoids the lead-out portion 103 undergoing a bend of less than or equal to 90°, effectively avoids the lead-out portion 103 folding back, and effectively reduces the degree of bending of the lead-out portion 103 itself. This avoids the height difference caused by the folding back of the lead-out portion 103, reduces the pressure exerted by the lead-out portion 103 on the cover plate 102, and thus helps to reduce the risk of cracking at the edge of the cell 150 in the cell string 100, thereby improving the structural stability of the photovoltaic module. In addition, the fact that the lead-out portion 103 does not need to fold back also helps to improve the connection strength between the lead-out portion 103 and the conductive components in the junction box 104, and reduces the risk of poor contact between the busbar 101 and the junction box 104.

[0044] It is worth emphasizing that the busbar 101 is located on the side of the first surface 110 away from the second surface 120, that is, the busbar 101 is hidden to increase the number of cell strings that can be arranged per unit area in the photovoltaic module.

[0045] The embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0046] In some embodiments, reference Figure 3 The busbar 101 electrically connects multiple solder strips 130 in the battery string 100 in at least two ways: in some cases, a single busbar 101 connects multiple solder strips 130 in the battery string 100 in series; in other cases, a single busbar 101 connects multiple solder strips 130 in the battery string 100 in parallel.

[0047] In some embodiments, reference Figure 3The battery string 100 includes multiple battery cells 150 connected in series. The battery cells 150 include, but are not limited to, PERC cells (Passivated Emitter Rear Cell), BC (Back Contact Cell), TOPCon cells (Tunnel Oxide Passivated Contact Cell), HIT / HJT cells (Heterojunction Technology Cell), thin-film solar cells, and tandem cells, or any combination thereof.

[0048] Among them, BC cells include, but are not limited to, IBC cells (Interdigitated Back Contact), HBC cells (Heterojunction Back Contact), TBC cells (TOPCon Back Contact), or HPBC cells (Hybrid Passivated Back Contact); thin-film solar cells include, but are not limited to, perovskite thin-film solar cells, copper indium selenide (CIGS) thin-film solar cells, gallium arsenide (GaAs) thin-film solar cells, and cadmium sulfide (CdS) thin-film solar cells. Tandem cells include, but are not limited to, perovskite cells stacked with crystalline silicon cells, perovskite cells stacked with perovskite cells, and perovskite cells stacked with thin-film cells.

[0049] The solar cell 150 can be a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, or a multi-component compound solar cell. Specifically, the multi-component compound solar cell can be a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenide solar cell, or a perovskite solar cell. Furthermore, the solar cell 150 can be a single cell or a sliced ​​cell; a sliced ​​cell refers to a cell formed by cutting a single, complete solar cell.

[0050] In some embodiments, reference Figure 5 , Figure 5 This is a partial perspective view of a junction box in a photovoltaic module according to an embodiment of the present disclosure. The junction box 104 includes a diode mounting area 114 and two spaced-apart outlets 124. The diode mounting area 114 is used to mount diodes, and the two outlets 124 are located on opposite sides of the diode mounting area 114 and are spaced apart along a direction perpendicular to the second direction Y1. The junction box 104 also includes an outer contour 134.

[0051] It is worth noting that, in conjunction with references Figure 5 and Figure 6, Figure 6 This is a schematic diagram of a combined three-dimensional structure of a junction box and lead-out portion in a photovoltaic module according to an embodiment of the present disclosure. The two extension segments 123 in a single lead-out group 13 not only extend alternately, but are also spaced apart along the fourth direction Z, i.e., perpendicular to the second direction Y1. Based on this, the two outlets 124 in the junction box 104 are designed to be spaced apart along the fourth direction Z, matching one-to-one with the two extension segments 123 in the single lead-out group 13. This helps avoid the need for the extension segments 123 to be bent again to match the position of the outlets 124 in the junction box 104, thereby improving the compatibility between the lead-out group 13 and the junction box 104. Furthermore, the two extension segments 123 in a single lead-out group 13 extend alternately in a direction inclined relative to the vertical direction. In this way, the lead-out portion 103 will not extend to the nearest outlet 124 in the junction box, but will extend to the outlet 124 further away in the junction box, which is beneficial to increase the extension space of the extension section 123 in the lead-out portion 103.

[0052] It should be noted that, in order to clearly illustrate the positional relationship between the junction box 104 and the lead-out part 103, Figure 6 The portion of the lead-out section 103 that is covered by the junction box 104 is drawn with a thicker dashed line, while the portion of the lead-out section 103 that is not covered by the junction box 104 is drawn with a thicker solid line.

[0053] In some embodiments, reference Figure 7 , Figure 7 This is another partial cross-sectional schematic diagram of a photovoltaic module provided in an embodiment of the present disclosure, with a single lead-out group 13 (see reference). Figure 4 The two battery strings 100 that are electrically connected each have a lead-out edge region 140. The two lead-out edge regions 140 are adjacent along the arrangement direction of the battery strings 100, and the outlet 124 is located on the battery strings 100 in the area other than the lead-out edge region 140.

[0054] It is worth noting that, in conjunction with references Figure 4 and Figure 7 The extension section 123 of the lead-out portion 103 extends to and passes through the lead-out outlet 124, facilitating the contact connection between the lead-out section 133 and the conductive component located near the lead-out outlet 124. The conductive component can be considered as the conductive terminal of the junction box. Based on this, the lead-out outlet 124 is designed to be located on the battery string 100 in an area other than the lead-out edge area 140, so that the positions of the lead-out section 133 and the lead-out outlet 124 are offset from the lead-out edge area 140. This avoids excessive pressure on the edge of the battery string when the lead-out section 133 connects to the conductive component located near the lead-out outlet 124, thereby effectively preventing microcracks in the battery cell 150.

[0055] It should be noted that, Figure 7 In the embodiment shown, one of the two leads 103 in a single lead-out group is as follows: Figure 4 The segment 133 shown is a horizontally extending line segment, and the other is as follows: Figure 7 As shown, the cross-sectional shape of the outlet section 133 is similar to an inverted Z-shape, and the portion of the outlet section 133 that is inclined relative to the second direction Y1 passes through the junction box 104 at the outlet 124. Furthermore, Figure 3 and Figure 7 The diagram shows the outer outline of the junction box 104, but does not show the components inside the junction box 104, such as diodes and conductive parts.

[0056] In some embodiments, reference Figure 7 Along the arrangement direction of the battery string 100, i.e., in the second direction Y1, the width of the lead-out edge area 140 can be greater than or equal to 15mm. This helps to ensure that the position of the lead-out part 103 corresponding to the lead-out port 124 of the junction box 104 does not miss the edge of the battery cell 150 in the battery string 100.

[0057] In some examples, the width of the lead-out edge area 140 along the arrangement direction of the battery string 100 can be 15.2mm, 15.5mm, 15.7mm, 15.8mm, 16mm, 16.3mm, 16.5mm, 16.7mm, or 17mm, etc. The width of the lead-out edge area 140 can be adjusted according to the actual size of the junction box 104.

[0058] In some embodiments, reference Figure 5 and Figure 6 Along the direction perpendicular to the second direction Y1, i.e., the fourth direction Z, the distance between the two outlets 124 inside the junction box 104 can be 0.8mm to 2mm. For example, the distance between the two outlets 124 inside the junction box 104 can be 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, or 1.9mm, etc.

[0059] In some embodiments, in conjunction with reference Figure 3 and Figure 4 In a single lead-out group 13, two leads 103 pass through the same opening 112 on the cover plate 102. In other words, in a single lead-out group 13, the two extension segments 123 of the two leads 103 can be designed to be close together along the second direction Y1. For example, the orthographic projections of the two extension segments 123 in a single lead-out group 13 on a reference plane have an intersection point, and the reference plane is a plane perpendicular to the fourth direction Z. In this way, the extension lengths of the connecting segments 133 in the two leads 103 in a single lead-out group 13 can be relatively short, so that they can respectively contact and connect with the conductive components in the junction box 104.

[0060] In other embodiments, in conjunction with reference to Figure 7 and Figure 4 In a single lead-out group 13, two leads 103 pass through two different openings 112 on the cover plate 102. In other words, in a single lead-out group 13, the two extensions 123 of the two leads 103 can be designed to be far apart along the second direction Y1. For example, the orthographic projections of the two extensions 123 in a single lead-out group 13 on a reference plane have no intersection point. The reference plane is a plane perpendicular to the fourth direction Z. An opening 112 is provided in the area of ​​the cover plate 102 opposite to one of the two adjacent battery strings 100. This opening 112 is used to allow the extension 123 of the lead-out 103, which is electrically connected to the battery string 100 below it, to pass through the cover plate 102. Another opening 112 is provided in the area of ​​the cover plate 102 opposite to the other of the two adjacent battery strings 100. This opening 112 is used to allow the extension 123 of the lead-out 103, which is electrically connected to the battery string 100 below it, to pass through the cover plate 102. Thus, in a single lead-out group 13, the extension length of the lead-out section 133 of one of the two lead-out parts 103 is longer, and it needs to extend to the cover plate 102 opposite to the other battery string 100. The extension length of the lead-out section 133 of the other lead-out part is shorter, so that the two lead-out parts 103 can respectively contact and connect with the conductive parts in the junction box 104. Then the junction box 104 is located on the opening 112 corresponding to the lead-out section 133 with shorter extension length.

[0061] It should be noted that, in one embodiment of this disclosure, the number of openings 112 on the cover plate 102 of the photovoltaic module is not limited, and can be adjusted according to the specific design of the two leads 103 in the lead-out group 13.

[0062] In some embodiments, reference Figure 3 or Figure 7 The junction box 104 covers at least one opening 112 on the cover plate 102; the photovoltaic module may also include a sealant located between the edges of the junction box 104 and the cover plate 102. This facilitates the use of the junction box 104 to shield the opening 112 on the cover plate 102, and the sealant can achieve a seal between the junction box 104 and the opening 112, improving the waterproof and dustproof performance of the photovoltaic module and reducing the risk of damage to the cell strings near the opening 112.

[0063] In some embodiments, reference Figure 3 , Figure 7 or Figure 8 , Figure 8This is a schematic diagram of a combined three-dimensional structure of a photovoltaic module and a lead-out portion provided in an embodiment of the present disclosure. The extension direction of the busbar 101 is the second direction Y1. In other words, along the extension direction of the busbar 101, two adjacent busbars 101 are arranged at intervals. Two battery strings 100 that are electrically connected to the two adjacent busbars 101 are arranged at intervals along the second direction Y1. The solder strips 130 in the battery strings 100 extend in a direction perpendicular to the second direction Y1. Multiple solder strips 130 are arranged at intervals along the second direction Y1.

[0064] It should be noted that, in order to clearly illustrate the relative positional relationship between the busbar 101 and the outlet 103, Figure 8 Other components in the photovoltaic module are not shown, and the lead-out part 103 is indicated by a thicker solid line.

[0065] In some cases, two adjacent busbars 101 each have a lead-out portion 103 extending from their two adjacent ends along the second direction Y1, and the junction box 104 generally covers the interval between the two adjacent busbars 101.

[0066] In other embodiments, reference is made to... Figure 9 , Figure 9 This is a schematic diagram of another combination of busbars and leads in a photovoltaic module provided in an embodiment of the present disclosure. The extension direction of the busbar 101 is perpendicular to the second direction Y1. In other words, the busbar 101 extends along the fourth direction Z. Two adjacent busbars 101 are arranged at intervals along the second direction Y1. Two battery strings 100 that are electrically connected to the two adjacent busbars 101 are arranged at intervals along the second direction Y1. The solder strips in the battery strings 100 also extend perpendicular to the second direction Y1. Multiple solder strips are arranged at intervals along the fourth direction Z.

[0067] It should be noted that, in order to clearly illustrate the relative positional relationship between the busbar 101 and the outlet 103, Figure 9 Other components in the photovoltaic module are not shown, and the lead-out part 103 is indicated by a thicker solid line.

[0068] In some cases, adjacent regions of two adjacent busbars 101 along the second direction Y1 also extend along the fourth direction Z, and the outlet 103 can be led out from any region of the busbar 101, including but not limited to leading out from the end of the busbar 101.

[0069] In some embodiments, reference Figure 4 In a single lead-out group 13, the angle β1 between the extension direction of one extension segment 123 and the second direction Y1 can be less than 1°, and / or the angle β2 between the extension direction of another extension segment 123 and the third direction Y2 can be less than 1°.

[0070] It is worth noting that the thickness of the cover plate 102 in the first direction X is very small. Therefore, the extension section 123 does not need to bend upwards too much to pass through the opening 112 on the cover plate 102 in a relatively short extension length. This helps to ensure that the bending degree of the extension section 123 relative to the access section 113 is small, further reducing the bending degree of the lead-out section 103 itself, thereby reducing the pressure exerted by the lead-out section 103 on the cover plate 102, thereby reducing the risk of cell cracking at the edge of the cell 150 in the cell string 100, and improving the structural stability of the photovoltaic module.

[0071] In some examples, the thickness of the cover plate 102 along the first direction X is greater than or equal to 1 mm. For example, the thickness of the cover plate 102 can be 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2.0 mm, etc.

[0072] In some cases, both the second direction Y1 and the third direction Y2 are parallel to the horizontal direction, but they are exactly opposite, with an angle of 180° between them. Based on this, the two extension segments 123 in a single lead-out group 13 have different inclination directions, and the acute angle between each segment and the horizontal direction can be less than 1°.

[0073] It should be noted that in practical applications, it is possible that the acute angle between the extension direction of only one extension segment 123 in a single lead-out group and the horizontal direction is less than 1°, or it is possible that the acute angle between the extension direction of both extension segments 123 in a single lead-out group and the horizontal direction is less than 1°.

[0074] In some embodiments, reference Figure 3 or Figure 7 In the two busbars 101 electrically connected to a single lead-out group 13, the spacing between adjacent busbars 101 can be greater than 5mm. This helps to ensure that the two leads drawn from the adjacent busbars 101 do not come into contact, thereby improving the electrical stability of the photovoltaic module.

[0075] In some examples, the spacing between adjacent busbars 101 electrically connected to a single lead-out group 13 can be 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, or 6.0 mm, etc.

[0076] In some embodiments, the width of the junction box 104 can be greater than 5 mm in the direction perpendicular to the second direction Y1. This provides sufficient space for the two outlets 124 of the junction box 104 that are spaced apart in the direction perpendicular to the second direction Y1, i.e., the fourth direction Z.

[0077] It should be noted that the width of the junction box 104 along the direction perpendicular to the second direction Y1, i.e. the fourth direction Z, refers to the width of the outer shell outline of the junction box 104.

[0078] In some examples, the width of the junction box 104 can be 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm or 6.0mm, etc., along the direction perpendicular to the second direction Y1.

[0079] In some embodiments, the width of the busbar 101 can be 10mm to 12mm in the direction perpendicular to the extension direction of the busbar 101. For example, the width of the busbar 101 can be 10.1mm, 10.2mm, 10.3mm, 10.4mm, 10.5mm, 10.6mm, 10.7mm, 10.8mm, 10.9mm, 11.0mm, 11.1mm, 11.2mm, 11.3mm, 11.4mm, 11.5mm, 11.6mm, 11.7mm, 11.8mm, or 11.9mm, etc.

[0080] In some cases, refer to Figure 3 In a single lead-out group 13, two leads 103 pass through the same opening 112 on the cover plate 102. In other words, a single opening 112 accommodates two staggered and spaced-apart leads 103. Then, along the fourth direction Z, the width of the opening 112 is at least the sum of the widths of the two busbars 101 and the spacing between the two busbars 101.

[0081] In some cases, refer to Figure 7 In a single lead-out group 13, two lead-out portions 103 pass through two different openings 112 on the cover plate 102. In other words, the two openings 112 respectively accommodate two staggered and spaced lead-out portions 103. Then, along the fourth direction Z, the width of the opening 112 is at least greater than the width of one busbar 101.

[0082] In summary, the design of a single lead-out group 13 involves one of its two extension segments 123 extending obliquely in the second direction Y1 and the other obliquely in the third direction Y2. Two busbars 101 electrically connected to the single lead-out group 13 are arranged at intervals along a direction perpendicular to the second direction Y1, resulting in the two extension segments 123 extending alternately and at intervals. This prevents the lead-out portion 103 from extending to the closest area in the junction box, instead extending to a more distant area. This increases the extension space of the extension segment 123, avoids bending of the lead-out portion 103 by less than or equal to 90°, effectively prevents folding back of the lead-out portion 103, and reduces the degree of bending itself. This avoids the height difference caused by folding back of the lead-out portion 103, reduces the pressure exerted by the lead-out portion 103 on the cover plate 102, and thus reduces the risk of cell cracking at the edges of the cell 150 in the cell string 100, thereby improving the structural stability of the photovoltaic module. In addition, the fact that the lead-out section 103 does not need to be folded back also helps to improve the connection strength between the lead-out section 103 and the conductive components inside the junction box 104, and reduces the risk of poor contact between the busbar 101 and the junction box 104.

[0083] 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 the embodiments of this disclosure. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the embodiments of this disclosure; therefore, the scope of protection of the embodiments of this disclosure should be determined by the scope defined in the claims.

Claims

1. A photovoltaic module, characterized in that, include: A battery string has a first surface and a second surface opposite each other along a first direction, the first direction being the thickness direction of the battery string; The busbar located on the side of the first surface away from the second surface is electrically connected to multiple solder strips in the battery string; A cover plate with an opening is located on the side of the battery string and the busbar away from the second surface; The lead-out section includes an access section, an extension section, and a discharge section. The extension section passes through the opening at an angle relative to the first direction. The two ends of the extension section are respectively connected to the access section and the discharge section. The access section is connected to the bus bar, and the discharge section is connected to the junction box. Wherein, two leads electrically connected to the same junction box form a lead group, and two busbars electrically connected to a single lead group are arranged at intervals and are respectively a first busbar and a second busbar. In a single lead group, one of the two extension segments extends obliquely in a second direction, and the other extends obliquely in a third direction. The second direction is the direction from the first busbar to the second busbar, and the third direction is opposite to the second direction. The junction box includes a diode mounting area for mounting diodes and two spaced-apart outlets. The two outlets are located on opposite sides of the diode mounting area and are spaced apart along a direction perpendicular to the second direction. Two leads in a single lead group pass through two different openings on the cover plate; two battery strings electrically connected to a single lead group each have lead edge regions, the two lead edge regions are adjacent along the arrangement direction of the battery strings, and the outlet is located on the area of ​​the battery string other than the lead edge regions.

2. The photovoltaic module according to claim 1, characterized in that, Along the arrangement direction of the battery string, the width of the lead-out edge region is greater than or equal to 15 mm.

3. The photovoltaic module according to claim 1, characterized in that, Along a direction perpendicular to the second direction, the distance between the two outlets inside the junction box is 0.8mm to 2mm.

4. The photovoltaic module according to claim 1, characterized in that, Along a direction perpendicular to the second direction, the width of the opening is greater than the width of a single busbar.

5. The photovoltaic module according to any one of claims 1 or 4, characterized in that, The width of the busbar is 10mm to 12mm in a direction perpendicular to the extension direction of the busbar.

6. The photovoltaic module according to claim 1, characterized in that, The junction box covers at least one opening on the cover plate; The photovoltaic module also includes a sealant located between the edges of the junction box and the cover plate.

7. The photovoltaic module according to claim 1, characterized in that, The extension direction of the busbar is the second direction, or the extension direction of the busbar is perpendicular to the second direction.

8. The photovoltaic module according to claim 1, characterized in that, In a single lead-out group, the angle between the extension direction of one of the extension segments and the second direction is less than 1°, and / or the angle between the extension direction of the other extension segment and the third direction is less than 1°.

9. The photovoltaic module according to claim 1 or 8, characterized in that, Along the first direction, the thickness of the cover plate is greater than or equal to 1 mm.

10. The photovoltaic module according to claim 1, characterized in that, In the two busbars that are electrically connected to a single lead-out group, the spacing between adjacent busbars is greater than 5 mm.

Images