Photovoltaic module

Abstract

The embodiment of the invention relates to the photovoltaic field, and provides a photovoltaic module, which comprises a battery string with a first surface and a second surface opposite to each other; the bus bar is positioned on one side, far away from the second surface, of the first surface and is electrically connected with a plurality of welding strips in the battery string; a cover plate covering the surfaces of the battery string and the bus bar has an opening; comprising an access section, an extension section and a lead-out section, the extension section obliquely penetrates through the opening relative to the first direction, the two ends of the extension section are connected with the access section and the lead-out section respectively, the access section is connected with the bus bar, and the lead-out section is connected into the junction box; the two lead-out parts electrically connected with the same junction box form a lead-out group, the two bus bars electrically connected with the single lead-out group are a first bus bar and a second bus bar, one of the two extension sections of the single lead-out group obliquely extends towards the second direction, the other extension section obliquely extends towards the third direction, and the two extension sections of the single lead-out group extend towards the third direction along the direction perpendicular to the second direction. And the two bus bars electrically connected with the single lead-out group are arranged at intervals, so that the structural stability of the photovoltaic module can be improved at least.

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] At present, with the gradual depletion of fossil energy, photovoltaic cells are increasingly used as a new energy alternative. Photovoltaic cells are devices that convert solar light energy into electrical energy. Photovoltaic junction boxes are connecting devices between the photovoltaic cell array composed of photovoltaic modules and the solar charging control device. Their main functions are to connect and protect photovoltaic modules, connect the power generated by photovoltaic cells to external lines, and conduct the current generated by photovoltaic modules.

[0003] However, when the busbar is electrically connected to the junction box, the mainstream method in the market is to design a lead-out wire on the busbar, and the lead-out wire passes through the cover plate to contact and connect with the junction box. During this connection process, an opening is designed in the junction box, and the lead-out wire passing through the opening needs to be bent and pressed by external force to weld the lead-out wire to the conductive parts in the junction box under high temperature conditions. This can easily lead to a large degree of bending of the lead-out wire, affecting the connection strength between the lead-out wire and the conductive parts in the junction box, and increasing the pressure applied to the cover plate, which will have an adverse effect on 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 the one hand, the embodiments of the present disclosure provide a photovoltaic module, 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 obliquely 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 formed 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 in the second direction, and the other extends obliquely in 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 in a direction perpendicular to the second direction.

[0006] In some embodiments, the junction box includes a diode mounting area and two lead-out ports spaced apart; 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 the two lead-out ports are spaced apart in a direction perpendicular to the second direction.

[0007] In some embodiments, the two battery strings electrically connected to the single lead-out group both 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 the 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 lead-out ports 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 respectively pass through two different openings on the cover plate.

[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 extension direction of the bus bar is the second direction, or the extension 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, among the two bus bars electrically connected to a single lead-out group, a distance between adjacent bus bars is greater than 5 mm.

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

[0016] It is designed that one of the two extension sections in a single lead-out group extends obliquely in the second direction, and the other extends obliquely in the 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 alternately and are arranged at intervals. In this way, the lead-out portion will not extend to the area closest to it in the junction box, but will extend to the area farther away from it in the junction box, which is conducive to lengthening the extension space of the extension section in the lead-out portion, avoiding the lead-out portion from experiencing a bending less than or equal to 90°, effectively avoiding the lead-out portion from folding back, and effectively reducing the degree of bending of the lead-out portion itself, so as to avoid the height difference caused by the lead-out portion folding back, and reduce the pressure exerted by the lead-out portion on the cover plate, which is conducive to reducing the risk of cracks at the edge of the battery cell in the battery string, thereby improving the structural stability of the photovoltaic module. In addition, the lead-out portion does not need to be folded back, which is also conducive to improving the connection strength between the lead-out portion and the conductive parts in the junction box, and reducing 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 pictures in the corresponding drawings, and these exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, 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 are 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 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 an 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 an embodiment of the present disclosure;

[0026] Fig. 9 A schematic diagram of another 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. DETAILED DESCRIPTION

[0027] As can be seen from the background technology, 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 bus bar 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 bus bar 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. It needs to experience a second bend to enter the junction box 20 from the lead-out port 40 and reach the diode terminal. The folding of the lead-out wire 30 causes a large height difference. When the photovoltaic module is subjected to excessive force or is used for a long time, it is easy to cause cracks at the edge of the battery cell, that is, the folding point of the lead-out wire 30.

[0029] in, Figure 1 It is a partial cross-sectional schematic diagram of a photovoltaic module provided with a junction box. Figure 22 is a partial top view of a junction box. To clearly illustrate the connection of the lead wire 30 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 show 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. 1 , 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 connected as shown in FIG. Figure 1 As shown, the lead wire 30 is bent again in the direction of itself, i.e., it is folded back. In this way, the lead wire 30 itself is bent to a great extent, and two layers of lead wires 30 are stacked on the cover plate 50 in the same vertical direction, which makes it easy for the lead wire 30 itself to crack and causes 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 is designed to extend obliquely in the second direction, and the other is designed to extend obliquely in the 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 are staggered and arranged at intervals. In this way, the lead-out portion will not extend to the area closest to it in the junction box, but will extend to the area farther away from it in the junction box, which is conducive to lengthening the extension space of the extension section in the lead-out portion, avoiding the lead-out portion from experiencing a bending less than or equal to 90°, effectively avoiding the lead-out portion from folding back, effectively reducing the degree of bending of the lead-out portion itself, avoiding 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 helping to reduce the risk of cracks at the edge of the battery cell in the battery string, thereby improving the structural stability of the photovoltaic module. In addition, the lead-out portion does not need to be folded back, which is also conducive to improving the connection strength between the lead-out 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, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present disclosure, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0033] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood 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 only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after 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 orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description. They do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present disclosure.

[0037] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0038] In the accompanying drawings corresponding to the embodiments of the present disclosure, the thickness and area of ​​the layers are magnified for better understanding and ease of description. When describing a component (such as a layer, a film, a region or a substrate) on another component or on the surface of another component, the component may be "directly" located on the surface of the other component, or a third component may be present between the two components. On the contrary, 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 "includes" 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, a film, a region, or a plate is referred to as being "on / located on" another component, it may 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 exist in between. In addition, when a component such as a layer, a film, a region, a plate, etc. is "directly located on" another component, or when a component such as a layer, a film, a region, a plate, etc. is located on the surface of another component, it means that no other components are located in between.

[0040] The terms used in the description of the various embodiments described herein are only used to describe specific embodiments and are not intended to be limiting. As used in the description of the various embodiments described and in the appended claims, "the components" are also intended to include plural forms unless the context clearly indicates otherwise. Among them, components include components such as layers, films, regions, or plates.

[0041] The following will describe the various embodiments of the present disclosure in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present disclosure, many technical details are provided in order to enable the reader to better understand the embodiments of the present disclosure. However, even without these technical details and various changes 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 assembly, 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 a plurality of photovoltaic cells, the battery string 100 having a first surface 110 and a second surface 120 opposite to each other along a first direction X, the first direction X being the thickness direction of the battery string 100; a bus bar 101, the bus bar 101 electrically connecting a plurality of welding strips 130 in the battery string 100, and the bus bar 101 is located on a side of the first surface 110 away from the second surface 120; a cover plate 102, used to cover the surface of the battery string 100 and the bus bar 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 connection section 133, the extension section 123 obliquely passes through the opening 112 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 connection box 104. 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 used 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 in a 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, Figure 4 A schematic diagram of a three-dimensional structure of a lead-out group in a photovoltaic module provided in an embodiment of the present disclosure. It should be noted that: Figure 3 In the figure, two lead-out portions 103 in a lead-out group 13 are indicated by thicker black solid lines. Figure 4 The dotted lines in the figure divide the access section 113, the extension section 123 and the connection 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 the 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 the single lead-out group 13 extend alternately in a direction inclined 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-out portion 103 will not extend to the area closest to it in the junction box, but to the area farther away from it in the junction box, which is conducive to lengthening the extension space of the extension section 123 in the lead-out portion 103, avoiding the lead-out portion 103 from experiencing a bending less than or equal to 90°, effectively avoiding the folding back of the lead-out portion 103, and effectively reducing the bending degree of the lead-out portion 103 itself, so as to avoid the height difference caused by the folding back of the lead-out portion 103, and reduce the pressure exerted by the lead-out portion 103 on the cover plate 102, which is conducive to reducing the risk of cracks on the edge of the battery cell 150 in the battery string 100, thereby improving the structural stability of the photovoltaic module. In addition, the lead-out portion 103 does not need to be folded back, which is also conducive to improving the connection strength between the lead-out portion 103 and the conductive parts in the junction box 104, and reducing the risk of poor contact between the bus bar 101 and the junction box 104.

[0048] It is worth emphasizing that the bus bar 101 is located on the side of the first surface 110 away from the second surface 120 , that is, the bus bar 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 one or any combination of PERC cells (Passivated Emitter Rear Cell), BC (Back Contact), TOPCon cells (Tunnel Oxide Passivated Contact), HIT / HJT cells (Heterojunction Technology), solar thin-film cells, and stacked cells.

[0052] 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, referring to cross-passivated back contact cells) or HPBC cells (Hybrid Passivated Back Contact, composite passivated back contact cells), etc.; solar thin-film cells include but are not limited to perovskite solar thin-film cells, copper indium selenide solar thin-film cells, gallium arsenide solar thin-film cells, and cadmium sulfide solar thin-film cells. Stacked cells include but are not limited to perovskite cells superimposed on crystalline silicon cells, perovskite cells superimposed on perovskite cells, and perovskite cells superimposed 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, and 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. In addition, the cell 150 may be a whole cell or a sliced ​​cell, and a sliced ​​cell refers to a cell formed by a complete whole cell through a cutting process.

[0054] In some embodiments, reference Figure 5 , Figure 5 A schematic diagram of a partial three-dimensional structure of a junction box in a photovoltaic module provided in an embodiment of the present disclosure, wherein the junction box 104 includes a diode mounting area 114 and two lead-out ports 124 disposed at intervals; the diode mounting area 114 is used to mount a diode, and the two lead-out ports 124 are located on opposite sides of the diode mounting area 114, and the two lead-out ports 124 are arranged at intervals in a direction perpendicular to the second direction Y1. The junction box 104 also includes a junction box outer profile 134.

[0055] It is worth noting that, combined with reference Figure 5 and Figure 6, 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 an embodiment of the present disclosure, wherein the two extension sections 123 in a single lead-out group 13 not only extend alternately, but also are arranged at intervals 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 arranged at intervals along the fourth direction Z, and to match the two extension sections 123 in the single lead-out group 13 one by one, which is beneficial to avoid the need for the extension section 123 to be bent again to match the position of the lead-out port 124 of the junction box 104, thereby facilitating the improvement of the adaptability of the lead-out group 13 and the junction box 104. Moreover, the two extension sections 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 does not extend to the lead-out port 124 closest to it in the junction box, but extends to the lead-out port 124 farther away from it in the junction box, thereby facilitating lengthening of the extension space of the extension section 123 in the lead-out 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 blocked by the junction box 104 is drawn with a thicker dotted line, and the portion of the lead-out portion 103 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 to each other each have a lead-out edge region 140 , the two lead-out edge regions 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 region 140 .

[0058] It is worth noting that, combined with reference Figure 4 and Figure 7 , the extension section 123 in the lead-out portion 103 extends to the lead-out port 124 and passes through the lead-out port 124, so that the lead-out section 133 is in contact with and connected to the conductive component disposed near the lead-out port 124, and the conductive component can be regarded as a conductive terminal of the junction box. Based on this, the lead-out port 124 is designed to be located on the battery string 100 except for the lead-out edge area 140, so that the position corresponding to the lead-out section 133 and the lead-out port 124 is staggered from the lead-out edge area 140, so as to avoid the lead-out section 133 from causing a large pressure on the edge of the battery string when connecting with the conductive component disposed near the lead-out port 124, thereby facilitating the effective prevention of hidden cracks in the battery string at the battery cell 150.

[0059] It should be noted that Figure 7 In the embodiment shown, one of the two lead-out portions 103 in a single lead-out 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. In addition, Figure 3 and Figure 7 In the figures, the junction box 104 is illustrated by the outer contour of the junction box, and the components inside the junction box 104, such as diodes, conductive components, etc., are not illustrated.

[0060] In some embodiments, reference Figure 7 , along the arrangement direction of the battery string 100, that is, in the second direction Y1, the width of the lead-out edge area 140 can be greater than or equal to 15 mm. In this way, it is helpful to ensure that the position corresponding to the lead-out portion 103 and the lead-out port 124 of the junction box 104 misses the edge of the battery cell 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 area 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 area 140 may be adjusted according to the actual size of the junction box 104 .

[0062] 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 in the junction box 104 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, etc.

[0063] In some embodiments, in conjunction with reference Figure 3 and Figure 4 In a single lead-out group 13, two lead-out portions 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 sections 123 in the two lead-out portions 103 can be designed to be relatively close in the second direction Y1. For example, the orthographic projections of the two extension sections 123 in the single lead-out group 13 on the reference plane have an intersection, and the reference plane is a plane perpendicular to the fourth direction Z. In this way, in a single lead-out group 13, the extension lengths of the connection sections 133 in the two lead-out portions 103 can be relatively short, so that they can be respectively contacted and connected 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, two lead-out portions 103 respectively pass through two different openings 112 on the cover plate 102. In other words, in a single lead-out group 13, two extension segments 123 in two lead-out portions 103 may be designed to be spaced far apart along the second direction Y1. For example, the orthographic projections of the two extension segments 123 in the single lead-out group 13 on the reference plane have no intersection, and the reference plane is a plane perpendicular to the fourth direction Z. An opening 112 is provided in the cover plate 102 on a region directly facing one of the two adjacent battery strings 100, and the opening 112 is used to allow the extension segment 123 in 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 provided in the cover plate 102 on a region directly facing the other of the two adjacent battery strings 100, and the opening 112 is used to allow the extension segment 123 in 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 lead-out section 133 of one of the two lead-out parts 103 is longer and needs to extend to the cover plate 102 directly opposite to the other battery string 100, and the extension length of the lead-out section 133 of the other one is shorter, so that the two lead-out parts 103 can be respectively contacted and connected with the conductive components in the junction box 104, and the junction box 104 is located on the opening 112 corresponding to the lead-out 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 opened on the cover plate 102 in the photovoltaic module, and 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 also include: a sealant located between the edges around the junction box 104 and the cover plate 102. In this way, it is beneficial to use the junction box 104 to cover the opening 112 on the cover plate 102, and the junction box 104 can be sealed to the opening 112 with the help of the sealant, thereby improving the waterproof and dustproof effect of the photovoltaic module and reducing the risk of damage to the cell string of the photovoltaic module 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, wherein 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 a plurality of 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 bus bars 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 bus bars 101 .

[0070] In other embodiments, reference Fig. 9 , Fig. 9 A schematic diagram of another 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, wherein the extension direction of the bus bar 101 is perpendicular to the second direction Y1. In other words, the bus bar 101 extends along the fourth direction Z, and two adjacent bus bars 101 are arranged at intervals along the second direction Y1. Two battery strings 100 electrically connected to the two adjacent bus bars 101 are arranged at intervals along the second direction Y1, and the welding strips in the battery strings 100 also extend perpendicular to the second direction Y1, and a plurality of 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, Fig. 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 bus bars 101 along the second direction Y1 also extend along the fourth direction Z, and the lead-out portion 103 may be led out from any region of the bus bar 101 , including but not limited to being led out from the end of the bus bar 101 .

[0073] In some embodiments, reference Figure 4 In a single lead-out group 13, an angle β1 between an extension direction of an extension segment 123 and the second direction Y1 may be less than 1°, and / or an angle β2 between an extension direction of another extension segment 123 and the third direction Y2 may 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 be tilted upward too much and can pass through the opening 112 on the cover plate 102 at a shorter extension length, which is conducive to ensuring that the extension section 123 is less bent relative to the access section 113, and further reducing the bending degree of the lead-out portion 103 itself, so as to reduce the pressure exerted by the lead-out portion 103 on the cover plate 102, thereby reducing the risk of cracks at the edge of the battery cell 150 in the battery string 100 and improving the structural stability of the photovoltaic module.

[0075] In some examples, along the first direction X, the thickness of the cover plate 102 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 parallel to the horizontal direction, but the second direction Y1 and the third direction Y2 are opposite, and the angle between them is 180°. Based on this, the two extension sections 123 in a single lead-out group 13 have different inclination directions, and the acute angle between each and the horizontal direction can be 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 bus bars 101 electrically connected to a single lead-out group 13, the spacing between adjacent bus bars 101 can be greater than 5 mm. This is helpful to ensure that the two lead-out portions respectively led out from the adjacent bus bars 101 will not be in contact with each other, thereby improving the electrical stability of the photovoltaic module.

[0079] In some examples, among two bus bars 101 electrically connected to a single lead group 13 , the spacing between adjacent bus bars 101 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, etc.

[0080] In some embodiments, the width of the junction box 104 may be greater than 5 mm in a direction perpendicular to the second direction Y1, so as to reserve sufficient arrangement space for the two outlets 124 of the junction box 104 arranged at intervals 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 profile 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, etc.

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

[0084] In some cases, reference Figure 3 In a single lead-out group 13, two lead-out portions 103 pass through the same opening 112 on the cover plate 102. In other words, a 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, it is designed that one of the two extension sections 123 in a single lead-out group 13 extends obliquely toward the second direction Y1, and the other extends obliquely toward the third direction Y2, and along the direction perpendicular to the second direction Y1, the two busbars 101 electrically connected to the single lead-out group 13 are arranged at intervals, so that the two extension sections 123 in the single lead-out group 13 extend alternately and are arranged at intervals. In this way, the lead-out portion 103 will not extend to the area closest to it in the junction box, but to the area farther away from it in the junction box, which is conducive to lengthening the extension space of the extension section 123 in the lead-out portion 103, avoiding the lead-out portion 103 from experiencing a bending less than or equal to 90°, effectively avoiding the folding of the lead-out portion 103, effectively reducing the bending degree of the lead-out portion 103 itself, avoiding the height difference caused by the folding of the lead-out portion 103, reducing the pressure exerted by the lead-out portion 103 on the cover plate 102, thereby helping to reduce the risk of cracks at the edge of the battery cell 150 in the battery string 100, thereby improving the structural stability of the photovoltaic module. In addition, the lead-out portion 103 does not need to be folded back, which is also helpful to improve the connection strength between the lead-out portion 103 and the conductive components in the junction box 104 and reduce the risk of poor contact between the bus bar 101 and the junction box 104 .

[0087] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in practical applications, various changes can 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 can make various changes and modifications without departing from the spirit and scope of the embodiments of the present disclosure, so the protection scope 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 battery string formed by connecting a plurality of photovoltaic cells, wherein the battery string has a first surface and a second surface opposite to each other along a first direction, The first direction is 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 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, and having an opening on the cover plate; A lead-out portion and a junction box, wherein the lead-out portion comprises an access section, an extension section and an outlet section, the extension section passes through the opening at an angle relative to the first direction, two ends of the extension section are respectively connected to the access section and the outlet section, the access section is connected to the bus bar, and the outlet section is connected to the junction box; Among them, 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 in 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 lead-out ports arranged at intervals; The diode mounting area is used to mount a diode, and the two lead-out ports are located on two opposite sides of the diode mounting area, and are arranged at intervals along 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 the 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 a region 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 lead-out ports 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 comprises: 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, an angle between an extension direction of one extension segment and the second direction is less than 1°, and / or an angle between an extension direction of another extension 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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