Photovoltaic module

Abstract

The embodiment of the present disclosure relates to the photovoltaic field, and provides a photovoltaic module, comprising: a cell string having 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 has an opening; an outgoing portion 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, the access section is connected to the busbar, and the exit section is connected to the junction box; two outgoing portions electrically connected to the same junction box form an outgoing group, two busbars electrically connected to a single outgoing group are a first busbar and a second busbar, one of the two extension sections of the single outgoing group extends in the second direction, and the other extends in the third direction, and the two busbars electrically connected to the single outgoing group are arranged at intervals in the direction perpendicular to the second direction, thereby at least improving the structural stability of the photovoltaic module.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the photovoltaic field, and in particular to a photovoltaic module. Background Art

[0002] With the gradual depletion of fossil fuels, photovoltaic cells are becoming increasingly popular as a new energy alternative. Photovoltaic cells convert sunlight into electricity. A photovoltaic junction box is a device that connects the photovoltaic cell array of photovoltaic modules and the solar charging control device. Its primary function is to connect and protect the photovoltaic modules, connect the electricity generated by the photovoltaic cells to external circuits, and conduct the current generated by the photovoltaic modules.

[0003] However, the current mainstream method for electrically connecting busbars to junction boxes is to design lead wires on the busbars, which then pass through a cover plate to connect to the junction box. During this connection process, the lead wires passing through an opening in the junction box must be bent and pressed externally to weld them to the conductive components inside the junction box under high-temperature conditions. This can lead to significant bending of the lead wires, affecting the connection strength between the lead wires and the conductive components inside the junction box, and increases the pressure on the cover plate, adversely affecting the structural stability of the back-contact photovoltaic module. Summary of the Invention

[0004] The embodiments of the present disclosure provide a photovoltaic module, which is at least beneficial to improving the structural stability of the photovoltaic module.

[0005] According to some embodiments of the present disclosure, on one hand, the embodiments of the present disclosure provide a photovoltaic assembly, comprising: a battery string formed by connecting a plurality of photovoltaic cells, the 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 bus bar, the bus bar electrically connecting a plurality of welding strips in the battery string, and the bus bar being located on a side of the first surface away from the second surface; a cover plate for covering the surface of the battery string and the bus bar, the cover plate having an opening; a lead-out portion and a junction box, the lead-out portion comprising an access section, an extension section and a connection section, the extension section passing through the opening at an angle relative to the first direction, and the two ends of the extension section being respectively connected to the access section. The lead-out section and the lead-out section, the lead-in section is connected to the bus bar, and the lead-out section is connected to the junction box; wherein, the two lead-out parts electrically connected to the same junction box are regarded as a lead-out group, and the two bus bars electrically connected to the single lead-out group are respectively the first bus bar and the second bus bar, and one of the two extension sections in the single lead-out group extends obliquely toward the second direction, and the other extends obliquely toward the third direction, the second direction is the direction from the first bus bar to the second bus bar, and the third direction is the direction from the second bus bar to the first bus bar, and the two bus bars electrically connected to the single lead-out group are arranged at intervals along a direction perpendicular to the second direction.

[0006] In some embodiments, the junction box includes a diode mounting area and two spaced-apart lead-out ports; the diode mounting area is used to mount a diode, and the two lead-out ports are located on opposite sides of the diode mounting area, and are spaced apart in a direction perpendicular to the second direction.

[0007] In some embodiments, the two battery strings electrically connected to a single lead-out group each have a lead-out edge area, the two lead-out edge areas are adjacent along the arrangement direction of the battery strings, and the lead-out port is located on an area of ​​the battery string excluding the lead-out edge area.

[0008] In some embodiments, along the arrangement direction of the battery strings, the width of the lead-out edge region is greater than or equal to 15 mm.

[0009] In some embodiments, along a direction perpendicular to the second direction, a distance between two outlets in the junction box is 0.8 mm to 2 mm.

[0010] In some embodiments, in a single lead-out group, the two lead-out portions pass through the same opening on the cover plate, or the two lead-out portions pass through two different openings on the cover plate respectively.

[0011] In some embodiments, the junction box covers at least one opening on the cover plate; the photovoltaic assembly further comprises: a sealant located between the edges around the junction box and the cover plate.

[0012] In some embodiments, the extending direction of the bus bar is the second direction, or the extending direction of the bus bar is perpendicular to the second direction.

[0013] 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°.

[0014] In some embodiments, a distance between two adjacent bus bars electrically connected to a single lead-out group is greater than 5 mm.

[0015] The technical solution provided by the embodiments of the present disclosure has at least the following advantages:

[0016] One of the two extension sections in a single lead-out group is designed to extend obliquely in the second direction, while the other extends obliquely in the third direction. Furthermore, the two busbars electrically connected to the single lead-out group are spaced apart in a direction perpendicular to the second direction, so that the two extension sections in a single lead-out group extend in an interlaced and spaced arrangement. This ensures that the lead portion does not extend to the area closest to it in the junction box, but rather to an area farther away from it. This helps increase the extension space of the extension section in the lead portion, prevents the lead portion from undergoing a bend of less than or equal to 90°, effectively prevents the lead portion from folding back, effectively reduces the degree of bending of the lead portion itself, avoids the height difference caused by the lead portion folding back, and reduces the pressure exerted by the lead portion on the cover plate, thereby reducing the risk of cracks on the edges of the cell strings and improving the structural stability of the photovoltaic module. Furthermore, since the lead portion does not need to fold back, it also helps improve the connection strength between the lead portion and the conductive components in the junction box and reduces the risk of poor contact between the busbar and the junction box. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the traditional technology, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1A partial cross-sectional schematic diagram of a photovoltaic module provided with a junction box;

[0019] Figure 2 It is a partial top view schematic diagram of a junction box;

[0020] Figure 3 A partial cross-sectional schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure;

[0021] Figure 4 A schematic diagram of a three-dimensional structure of a lead-out group in a photovoltaic module provided by an embodiment of the present disclosure;

[0022] Figure 5 A schematic diagram of a partial three-dimensional structure of a junction box in a photovoltaic module provided by an embodiment of the present disclosure;

[0023] Figure 6 A schematic diagram of a combined three-dimensional structure of a junction box and a lead-out portion in a photovoltaic module provided in one embodiment of the present disclosure;

[0024] Figure 7 Another partial cross-sectional schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure;

[0025] Figure 8 A schematic diagram of a combined three-dimensional structure of a bus bar and a lead-out portion in a photovoltaic module provided in one embodiment of the present disclosure;

[0026] Figure 9 This is a schematic diagram of another combined three-dimensional structure of a bus bar and a lead-out portion in a photovoltaic module provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] As can be seen from the background art, the structural stability of photovoltaic modules needs to be improved.

[0028] The analysis found that the 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 lead-out port 40 for accessing the lead-out wire 30 on the busbar 10 is located on opposite sides of the diode. When the lead-out wire 30 passes through the opening 60 in the cover plate 50, it will experience a first bend. When it enters the junction box 20 from the lead-out port 40 and reaches the connection terminal of the diode, it needs to undergo a second bend. The folding of the lead-out wire 30 causes a large height difference. If the photovoltaic module is subsequently subjected to excessive force or is used for a long time, it is easy to cause cracks at the edge of the cell, that is, the folding point of the lead-out wire 30.

[0029] in, Figure 1 This is a partial cross-sectional schematic diagram of a photovoltaic module provided with a junction box. Figure 2This is a partial top view of a junction box. To clearly illustrate the situation where the lead wire 30 is connected to the junction box 20, Figure 1 Only the outer contour of the junction box 20 is shown, and the components inside the junction box 20 are not shown; in order to clearly illustrate the positional relationship between the lead-out port 40 in the junction box 20 and the diode body 70, Figure 2 Only the lead-out port 40 and the diode body 70 in the junction box 20 are shown, and other components in the junction box 20 are not shown.

[0030] and, Figure 2 In the junction box 20 shown in FIG, based on the positional relationship between the lead-out port 40 of the junction box 20 and the diode body 70, that is, the two lead-out ports 40 are located on opposite sides of the diode body 70, the lead-out wire 30 can only be as follows Figure 1 As shown, the lead wire 30 is bent again in the direction of itself, i.e., folded back. This causes the lead wire 30 to bend significantly, and two layers of lead wires 30 are stacked on the cover plate 50 in the same vertical direction, which makes the lead wire 30 prone to cracking and puts greater pressure on the photovoltaic module.

[0031] The present disclosure provides a photovoltaic module, wherein one of the two extension sections in a single lead-out group extends obliquely in a second direction, and the other extends obliquely in a third direction, and the two busbars electrically connected to the single lead-out group are arranged at intervals in a direction perpendicular to the second direction, so that the two extension sections in the single lead-out group extend in an interlaced manner and are arranged at intervals. In this way, the lead portion does not extend to the area closest to it in the junction box, but instead extends to an area farther away from it in the junction box, thereby facilitating the extension space of the extension section in the lead portion, preventing the lead portion from undergoing a bend of less than or equal to 90°, effectively avoiding the lead portion from folding back, and effectively reducing the degree of bending of the lead portion itself, thereby avoiding the height difference caused by the lead portion folding back, and reducing the pressure exerted by the lead portion on the cover plate, thereby facilitating the reduction of the risk of cracks at the edges of the battery cells in the battery string, thereby improving the structural stability of the photovoltaic module. In addition, the lead portion does not need to fold back, which is also beneficial for improving the connection strength between the lead portion and the conductive components in the junction box and reducing the risk of poor contact between the busbar and the junction box.

[0032] In the description of the embodiments of the present disclosure, technical terms such as "first" and "second" are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0033] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] In the description of the embodiments of the present disclosure, the term "and / or" is merely a description of an association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent the following three situations: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0035] In the description of the embodiments of the present disclosure, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0036] In the description of the embodiments of the present disclosure, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present disclosure.

[0037] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0038] In the accompanying drawings corresponding to the embodiments of the present disclosure, the thickness and area of ​​the layers are exaggerated for better understanding and ease of description. When describing a component (such as a layer, film, region or substrate) on another component or on the surface of another component, the component can be "directly" located on the surface of the other component, or a third component can be present between the two components. Conversely, when describing a component on the surface of another component or when another component is formed or provided on the surface of a component, it means that there is no third component between the two components. In addition, when describing a component as being "substantially" 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 partial edge of the entire surface.

[0039] In the description of the embodiments of the present disclosure, when a component is referred to as "including" another component, unless otherwise specified, other components are not excluded, and other components may be further included. In addition, 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 can be present between them. In addition, when a component such as a layer, film, region, or plate is "directly on" another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it means that no other components are located between them.

[0040] The terms used herein in the description of the various embodiments are intended only to describe the specific embodiments and are not intended to be limiting. As used in the description of the various embodiments and the appended claims, "the component" is intended to include the plural form unless the context clearly indicates otherwise. A component includes a layer, film, region, or plate.

[0041] The following describes various embodiments of the present disclosure in detail with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in the various embodiments of the present disclosure to help readers better understand the embodiments of the present disclosure. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the embodiments of the present disclosure can be implemented.

[0042] An embodiment of the present disclosure provides a photovoltaic module, which will be described in detail below with reference to the accompanying drawings.

[0043] Combined with reference Figure 3 and Figure 4The photovoltaic module includes: a battery string 100 formed by connecting multiple photovoltaic cells, the battery string 100 has a first surface 110 and a second surface 120 opposite to each other along a first direction X, and the first direction X is the thickness direction of the battery string 100; a bus bar 101, the bus bar 101 electrically connects multiple welding strips 130 in the battery string 100, and the bus bar 101 is located on the side of the first surface 110 away from the second surface 120; a cover 102 for covering the surface of the battery string 100 and the bus bar 101, and the cover 102 has an opening 112; a lead-out portion 103 and a junction box 104, the lead-out portion 103 includes an access section 113, an extension section 123 and a connection section 133, the extension section 123 passes through the opening 112 obliquely relative to the first direction X, and the two ends of the extension section 123 are respectively connected to the access section 113 and the junction box. The lead section 133 and the access section 113 are connected to the bus bar 101, and the lead section 133 is connected to the junction box 104; wherein, the two lead portions 103 electrically connected to the same junction box 104 are regarded as a group of lead groups 13, and the two bus bars 101 electrically connected to the single lead group 13 are respectively the first bus bar 101a and the second bus bar 101b, and one of the two extension sections 123 in the single lead group 13 extends obliquely toward the second direction Y1, and the other extends obliquely toward 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, and the two bus bars 101 electrically connected to the single lead group 13 are arranged at intervals along the direction perpendicular to the second direction Y1.

[0044] in, Figure 3 A partial cross-sectional schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure is shown. Figure 4 This is a schematic diagram of a three-dimensional structure of a lead-out group in a photovoltaic module provided by an embodiment of the present disclosure. It should be noted that: Figure 3 The thicker black solid line indicates two lead portions 103 in a lead group 13. Figure 4 The dotted lines in FIG. 1 divide the access section 113, the extension section 123 and the outlet section 133 in the lead-out portion 103. In addition, the direction perpendicular to the second direction Y1 can be regarded as Figure 4 The fourth direction Z shown in .

[0045] It is worth noting that one of the two extension sections 123 in a single lead-out group 13 is designed to extend obliquely toward the second direction Y1, and the other is designed to extend obliquely toward the third direction Y2. The second direction Y1 is the direction from the first bus bar 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. That is, the two extension sections 123 in a single lead-out group 13 extend alternately along a direction oblique relative to the vertical direction.

[0046] In other words, the two extension sections 123 in a single lead-out group 13 are divided into a first extension section 123a and a second extension section 123b. The bus bar 101 connected to the first extension section 123a is the first bus bar 101a, and the bus bar 101 connected to the second extension section 123b is the second bus bar 101b. The first extension section 123a extends obliquely in the direction from the first bus bar 101a to the second bus bar 101b, and the second extension section 123b extends obliquely in the direction from the second bus bar 101b to the first bus bar 101a.

[0047] Moreover, along the direction perpendicular to the second direction Y1, the two bus bars 101 electrically connected to the single lead-out group 13 are arranged at intervals, and the two lead-out parts 103 in the single lead-out group 13 respectively connected to the two bus bars 101 are also arranged at intervals, so the two extension sections 123 in the single lead-out group 13 will not interfere with each other when extending, and the two extension sections 123 in the single lead-out group 13 extend alternately in a direction inclined relative to the vertical direction. In this way, the lead portion 103 does not extend to the area closest to it in the junction box, but instead extends to an area farther away from it. This helps to extend the extension space of the extension section 123 in the lead portion 103, prevents the lead portion 103 from undergoing a bend less than or equal to 90°, effectively prevents the lead portion 103 from folding back, and effectively reduces the degree of bending of the lead portion 103 itself, thereby avoiding the height difference caused by the folding of the lead portion 103 and reducing the pressure exerted by the lead portion 103 on the cover plate 102, thereby helping to reduce the risk of cracks on the edges of the battery cells 150 in the battery string 100, thereby improving the structural stability of the photovoltaic module. In addition, the lead portion 103 does not need to fold back, which helps to improve the connection strength between the lead 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.

[0048] 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 designed to be hidden to increase the number of battery strings that can be arranged per unit area in the photovoltaic module.

[0049] The embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0050] In some embodiments, reference Figure 3 The bus bar 101 electrically connects the multiple welding ribbons 130 in the battery string 100, including at least the following two situations: in some situations, a single bus bar 101 connects the multiple welding ribbons 130 in the battery string 100 in series; in other situations, a single bus bar 101 connects the multiple welding ribbons 130 in the battery string 100 in parallel.

[0051] In some embodiments, reference Figure 3The battery string 100 includes a plurality of battery cells 150 connected in series, and the battery cells 150 include but are not limited to PERC batteries (Passivated Emitter Rear Cell), BC (Back Contact), TOPCon batteries (Tunnel Oxide Passivated Contact), HIT / HJT batteries (Heterojunction Technology), solar thin-film batteries, and stacked batteries, or any combination thereof.

[0052] BC cells include but are not limited to IBC cells (Interdigitated Back Contact), HBC cells (Heterojunction Back Contact), TBC cells (TOPCon Back Contact), and HPBC cells (Hybrid Passivated Back Contact). Thin-film solar cells include but are not limited to perovskite thin-film solar cells, copper indium selenide thin-film solar cells, gallium arsenide thin-film solar cells, and cadmium sulfide thin-film solar cells. Tandem cells include but are not limited to perovskite cells stacked on crystalline silicon cells, perovskite cells stacked on perovskite cells, and perovskite cells stacked on thin-film cells.

[0053] The cell 150 may be a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, or a multi-compound solar cell. The multi-compound solar cell may specifically be a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenide solar cell, or a perovskite solar cell. Furthermore, the cell 150 may be a whole cell or a sliced ​​cell. A sliced ​​cell refers to a cell formed by cutting a complete whole cell.

[0054] In some embodiments, reference Figure 5 , Figure 5 This is a schematic diagram of a partial three-dimensional structure of a junction box in a photovoltaic module according to an embodiment of the present disclosure. Junction box 104 includes a diode mounting area 114 and two spaced-apart lead-out ports 124. Diode mounting area 114 is used to mount diodes. Lead-out ports 124 are located on opposite sides of diode mounting area 114 and are spaced apart in a direction perpendicular to second direction Y1. Junction box 104 also includes an outer junction box profile 134.

[0055] It is worth noting that, combined with reference 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 provided by an embodiment of the present disclosure. The two extension sections 123 in a single lead-out group 13 not only extend in an interlaced manner, but are also spaced apart along a fourth direction Z, i.e., a direction perpendicular to the second direction Y1. Based on this, the two lead-out ports 124 in the junction box 104 are designed to be spaced apart along the fourth direction Z, matching the two extension sections 123 in the single lead-out group 13 one-to-one. This helps avoid the need for the extension sections 123 to bend again to match the position of the lead-out ports 124 of the junction box 104, thereby improving the compatibility between the lead-out group 13 and the junction box 104. Furthermore, the two extension sections 123 in a single lead-out group 13 extend in an interlaced manner in a direction that is inclined relative to the vertical direction. In this way, the lead portion 103 does not extend to the lead outlet 124 closest to it in the junction box, but extends to the lead outlet 124 farther away from it in the junction box, thereby facilitating lengthening the extension space of the extension section 123 in the lead portion 103 .

[0056] It should be noted that, in order to clearly illustrate the positional relationship between the junction box 104 and the lead-out portion 103, Figure 6 The portion of the lead-out portion 103 that is blocked by the junction box 104 is drawn with a thicker dotted line, and the portion of the lead-out portion 103 that is not blocked by the junction box 104 is drawn with a thicker solid line.

[0057] In some embodiments, reference Figure 7 , Figure 7 Another partial cross-sectional schematic diagram of a photovoltaic module provided by an embodiment of the present disclosure, and a single lead group 13 (reference Figure 4 ) The two battery strings 100 electrically connected each have a lead-out edge area 140, the two lead-out edge areas 140 are adjacent to each other along the arrangement direction of the battery strings 100, and the lead-out port 124 is located on the battery string 100 except the lead-out edge area 140.

[0058] It is worth noting that, combined with reference Figure 4 and Figure 7 The extension section 123 of the lead-out portion 103 extends to and through the lead-out port 124, facilitating contact and connection between the lead-out section 133 and the conductive component disposed near the lead-out port 124. The conductive component can be considered a conductive terminal of the junction box. Based on this, the lead-out port 124 is designed to be located in an area of ​​the battery string 100 outside the lead-out edge region 140. This ensures that the corresponding positions of the lead-out section 133 and the lead-out port 124 are offset from the lead-out edge region 140. This prevents the lead-out section 133 from exerting significant pressure on the edge of the battery string when connecting with the conductive component disposed near the lead-out port 124, thereby effectively preventing hidden cracks in the battery string at the cell 150.

[0059] It should be noted that Figure 7 In the embodiment shown, one of the two lead portions 103 in a single lead group is as follows: Figure 4 The connecting segment 133 is a line segment of the horizontal eye, and the other one is as shown in FIG. 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 outlet 124 of the junction box 104. Figure 3 and Figure 7 In the figures, the junction box 104 is shown by its outer outline, and components inside the junction box 104, such as diodes and conductive components, are not shown.

[0060] In some embodiments, reference Figure 7 Along the arrangement direction of the battery string 100, i.e., the second direction Y1, the width of the lead-out edge region 140 can be greater than or equal to 15 mm. This helps ensure that the corresponding position of the lead-out portion 103 and the lead-out port 124 of the junction box 104 misses the edge of the battery cells 150 in the battery string 100.

[0061] In some examples, along the arrangement direction of the battery string 100 , the width of the lead-out edge region 140 may be 15.2 mm, 15.5 mm, 15.7 mm, 15.8 mm, 16 mm, 16.3 mm, 16.5 mm, 16.7 mm, or 17 mm, etc. The width of the lead-out edge region 140 may be adjusted according to the actual size of the junction box 104 .

[0062] In some embodiments, reference Figure 5 and Figure 6 The distance between the two outlets 124 in the junction box 104 along the direction perpendicular to the second direction Y1, i.e., the fourth direction Z, may be 0.8 mm to 2 mm. For example, the distance between the two outlets 124 in the junction box 104 may be 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, or 1.9 mm.

[0063] In some embodiments, in conjunction with reference Figure 3 and Figure 4 In a single lead-out group 13, the two lead portions 103 pass through the same opening 112 in the cover plate 102. In other words, the two extension segments 123 of the two lead portions 103 in a single lead-out group 13 can be designed to be closely spaced 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 perpendicular to the fourth direction Z intersect. In this way, the extension lengths of the connection segments 133 of the two lead portions 103 in a single lead-out group 13 can be relatively short, allowing them to contact and connect with the conductive components in the junction box 104.

[0064] In other embodiments, in combination with reference Figure 7 and Figure 4 In a single lead-out group 13, the two lead-out portions 103 respectively pass through two different openings 112 in the cover plate 102. In other words, in a single lead-out group 13, the two extensions 123 of the two lead-out portions 103 can be designed to be spaced relatively far apart along the second direction Y1. For example, the orthographic projections of the two extensions 123 in the single lead-out group 13 on a reference plane have no intersection. The reference plane is a plane perpendicular to the fourth direction Z. An opening 112 is defined in a region of the cover plate 102 that directly faces one of the two adjacent battery strings 100. This opening 112 allows the extension 123 of the lead-out portion 103 electrically connected to the battery string 100 located therebelow to pass through the cover plate 102. Another opening 112 is defined in a region of the cover plate 102 that directly faces the other of the two adjacent battery strings 100. This opening 112 allows the extension 123 of the lead-out portion 103 electrically connected to the battery string 100 located therebelow to pass through the cover plate 102. In this way, in a single lead-out group 13, the extension length of the connection section 133 of one of the two lead-out parts 103 is longer and needs to extend to the cover plate 102 directly opposite the other battery string 100, while the extension length of the connection 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 components in the junction box 104. The junction box 104 is then located on the opening 112 corresponding to the connection section 133 with the shorter extension length.

[0065] It should be noted that an embodiment of the present disclosure does not limit the number of openings 112 provided on the cover plate 102 in the photovoltaic module, and the number can be adjusted according to the specific design of the two lead-out portions 103 in the lead-out group 13 .

[0066] 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 further include a sealant located between the edges of the junction box 104 and the cover plate 102. This facilitates shielding the opening 112 on the cover plate 102 with the junction box 104, and allows the junction box 104 to seal the opening 112 with the sealant, thereby improving the waterproof and dustproof performance of the photovoltaic module and reducing the risk of damage to the photovoltaic module's cell strings near the opening 112.

[0067] In some embodiments, reference Figure 3 、 Figure 7 or Figure 8 , Figure 8A schematic diagram of a combined three-dimensional structure of a bus bar and a lead-out portion in a photovoltaic module provided in an embodiment of the present disclosure is provided. The extension direction of the bus bar 101 is the second direction Y1. In other words, along the extension direction of the bus bar 101, two adjacent bus bars 101 are arranged at intervals, and two battery strings 100 electrically connected to the two adjacent bus bars 101 are arranged at intervals along the second direction Y1. The welding strips 130 in the battery strings 100 extend in a direction perpendicular to the second direction Y1, and multiple welding strips 130 are arranged at intervals along the second direction Y1.

[0068] It should be noted that, in order to clearly illustrate the relative positional relationship between the bus bar 101 and the lead portion 103, Figure 8 Other components in the photovoltaic module are not shown, and the lead-out portion 103 is shown with a thicker solid line.

[0069] In some cases, two adjacent busbars 101 each have a lead-out portion 103 at two adjacent ends along the second direction Y1 , and the junction box 104 substantially covers the space between the two adjacent busbars 101 .

[0070] In other embodiments, reference Figure 9 , Figure 9 This is a schematic diagram of another combined three-dimensional structure of the busbar and the lead-out portion 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, and two adjacent busbars 101 are arranged at intervals along the second direction Y1. The two battery strings 100 electrically connected to the two adjacent busbars 101 are arranged at intervals along the second direction Y1. The welding strips in the battery strings 100 also extend perpendicular to the second direction Y1, and multiple welding strips are arranged at intervals along the fourth direction Z.

[0071] It should be noted that, in order to clearly illustrate the relative positional relationship between the bus bar 101 and the lead portion 103, Figure 9 Other components in the photovoltaic module are not shown, and the lead-out portion 103 is shown with a thicker solid line.

[0072] In some cases, adjacent regions of two adjacent busbars 101 along the second direction Y1 also extend along the fourth direction Z, and the lead-out portion 103 can be led out from any region of the busbar 101 , including but not limited to from the end of the busbar 101 .

[0073] In some embodiments, reference Figure 4 In a single lead-out group 13, the angle β1 between the extending direction of an extension section 123 and the second direction Y1 can be less than 1°, and / or the angle β2 between the extending direction of another extension section 123 and the third direction Y2 can be less than 1°.

[0074] It is worth noting that the thickness of the cover plate 102 in the first direction X is very small, so the extension section 123 does not need to bend upward too much and can pass through the opening 112 on the cover plate 102 at a shorter extension length. This is conducive to ensuring that the extension section 123 is less bent relative to the access section 113, further reducing the bending degree of the lead-out portion 103 itself, thereby reducing the pressure exerted by the lead-out portion 103 on the cover plate 102, thereby reducing the risk of cracks appearing at the edges of the battery cells 150 in the battery string 100, and improving the structural stability of the photovoltaic module.

[0075] 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 may 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.

[0076] In some cases, the second direction Y1 and the third direction Y2 are both parallel to the horizontal direction, but are opposite to each other, with an angle of 180° between them. Based on this, the two extension segments 123 in a single lead-out group 13 may have different inclinations, and each may have an acute angle with the horizontal direction of less than 1°.

[0077] It should be noted that in actual applications, the acute angle between the extension direction of only one extension segment 123 in a single lead-out group and the horizontal direction may be less than 1°, or the acute angle between the extension direction of two extension segments 123 in a single lead-out group and the horizontal direction may be less than 1°.

[0078] In some embodiments, reference Figure 3 or Figure 7 Among the two busbars 101 electrically connected to a single lead-out group 13, the spacing between adjacent busbars 101 can be greater than 5 mm. This is beneficial to ensure that the two lead-out portions respectively led out from adjacent busbars 101 will not touch and connect, thereby improving the electrical stability of the photovoltaic module.

[0079] In some examples, the spacing between two adjacent busbars 101 electrically connected to a single lead group 13 may 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.

[0080] In some embodiments, the width of the junction box 104 in a direction perpendicular to the second direction Y1 may be greater than 5 mm, so as to reserve sufficient space for the two outlets 124 of the junction box 104 spaced apart in a direction perpendicular to the second direction Y1, i.e., in the fourth direction Z.

[0081] It should be noted that, along the direction perpendicular to the second direction Y1 , ie, the fourth direction Z, the width of the junction box 104 refers to the width of the outer shell of the junction box 104 .

[0082] In some examples, along a direction perpendicular to the second direction Y1 , the width of the junction box 104 may 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.

[0083] In some embodiments, the width of the busbar 101 may be 10 mm to 12 mm in a direction perpendicular to the extending direction of the busbar 101. For example, the width of the busbar 101 may be 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8, 10.9, 11.0, 11.1, 11.2, 11.3, 11.4, 11.5, 11.6, 11.7, 11.8, or 11.9 mm.

[0084] In some cases, reference Figure 3 In a single lead-out group 13, the two lead-out portions 103 pass through the same opening 112 on the cover plate 102. In other words, the single opening 112 accommodates two lead-out portions 103 that extend alternately and are arranged at intervals. Then, along the fourth direction Z, the width of the opening 112 is at least the sum of the width of the two bus bars 101 and the distance between the two bus bars 101.

[0085] In some cases, reference Figure 7 In a single lead-out group 13, the two lead-out portions 103 respectively pass through two different openings 112 on the cover plate 102. In other words, the two openings 112 respectively accommodate two lead-out portions 103 that extend alternately and are arranged at intervals. Then, along the fourth direction Z, the width of the opening 112 is at least greater than the width of one bus bar 101.

[0086] In summary, one of the two extension segments 123 in a single lead group 13 is designed to extend obliquely in the second direction Y1, while the other extends obliquely in the third direction Y2. Furthermore, the two busbars 101 electrically connected to the single lead group 13 are arranged in a direction perpendicular to the second direction Y1, so that the two extension segments 123 in a single lead group 13 extend in an interlaced and spaced arrangement. This ensures that the lead portion 103 does not extend to the area closest to it in the junction box, but rather to an area farther from it. This effectively increases the extension space for the extension segments 123 in the lead portion 103, prevents the lead portion 103 from bending less than or equal to 90 degrees, effectively prevents the lead portion 103 from folding back, effectively reduces the degree of bending of the lead portion 103 itself, avoids the height difference caused by the folding of the lead portion 103, and reduces the pressure exerted by the lead portion 103 on the cover plate 102. This reduces the risk of cracks forming at the edges of the cell 150 in the cell string 100, thereby improving the structural stability of the photovoltaic module. In addition, the lead portion 103 does not need to be folded back, which is beneficial for improving the connection strength between the lead portion 103 and the conductive components in the junction box 104 and reducing the risk of poor contact between the busbar 101 and the junction box 104.

[0087] Those skilled in the art will appreciate that the above-described embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made to them in form and detail without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the embodiments of the present disclosure. Therefore, the scope of protection of the embodiments of the present disclosure shall be based on the scope defined in the claims.

Claims

1. A photovoltaic module, characterized in that: include: A cell string formed by connecting a plurality of photovoltaic cells, wherein the cell string has a first side and a second side opposite to each other along a first direction, The first direction is the thickness direction of the battery string; a bus bar electrically connecting a plurality of welding ribbons in the battery string, and the bus bar is located on a side of the first surface away from the second surface; a cover plate, used to cover the surface of the battery string and the bus bar, the cover plate having an opening; A lead-out portion and a junction box, the lead-out portion comprising an access section, an extension section, and an outlet section, the extension section passing through the opening at an angle relative to the first direction, two ends of the extension section respectively connected to the access section and the outlet section, the access section connected to the bus bar, and the outlet section connected to the junction box; In which, the two lead-out parts electrically connected to the same junction box are regarded as a lead-out group, and the two bus bars electrically connected to the single lead-out group are respectively the first bus bar and the second bus bar, and one of the two extension sections in the single lead-out group extends obliquely toward the second direction, and the other extends obliquely toward the third direction, the second direction is the direction from the first bus bar to the second bus bar, and the third direction is the direction from the second bus bar to the first bus bar, and the two bus bars electrically connected to the single lead-out group are arranged at intervals along a direction perpendicular to the second direction.

2. The photovoltaic module according to claim 1, characterized in that The junction box includes a diode installation area and two outlets arranged at intervals; The diode mounting area is used to mount a diode. The two lead-out ports are located on opposite sides of the diode mounting area and are spaced apart in a direction perpendicular to the second direction.

3. The photovoltaic module according to claim 2, characterized in that The two battery strings electrically connected to a single lead-out group each have a lead-out edge region, the two lead-out edge regions are adjacent to each other along the arrangement direction of the battery strings, and the lead-out port is located on an area of ​​the battery string excluding the lead-out edge region.

4. The photovoltaic module according to claim 3, characterized in that Along the arrangement direction of the battery strings, the width of the lead-out edge area is greater than or equal to 15 mm.

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

6. The photovoltaic module according to claim 1, characterized in that In a single lead-out group, the two lead-out portions pass through the same opening on the cover plate, or the two lead-out portions pass through two different openings on the cover plate respectively.

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

8. The photovoltaic module according to claim 1, characterized in that The extending direction of the bus bar is the second direction, or the extending direction of the bus bar is perpendicular to the second direction.

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

10. The photovoltaic module according to claim 1, characterized in that: Among the two bus bars electrically connected to a single lead-out group, a distance between adjacent bus bars is greater than 5 mm.

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