Photovoltaic junction box, junction box assembly and photovoltaic assembly

Abstract

The photovoltaic junction box, the junction box assembly and the photovoltaic assembly are applied to the photovoltaic assembly, the photovoltaic assembly comprises a plurality of battery strings distributed in the first direction, each battery string comprises a plurality of battery pieces distributed in the second direction, and a piece gap for containing a bus bar is formed between every two adjacent battery pieces in the same battery string. The photovoltaic junction box comprises a box body, the box body comprises a first surface and a second surface which are oppositely arranged, the first surface comprises a first area facing a piece gap and a second area facing a battery piece, and the first area is provided with a supporting part. According to the utility model, the supporting part is arranged in the first area of the first surface of the photovoltaic junction box, so that when the photovoltaic junction box is connected to the back plate, the probability that the battery piece is cracked due to extrusion of the supporting part can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to photovoltaic module technical field, concretely relates to a kind of photovoltaic junction box, junction box assembly and photovoltaic module. BACKGROUND

[0002] In the field of photovoltaic power generation, the main role of photovoltaic junction box is to connect and protect photovoltaic module, and transmit the current generated by photovoltaic module. Photovoltaic junction box is generally bonded on the backboard of photovoltaic module by pouring glue process. In order to facilitate pouring glue between photovoltaic junction box and backboard, a support part is arranged on photovoltaic junction box to separate photovoltaic junction box and backboard by a certain distance.

[0003] The backboard of single-glass module is generally a flexible plate made of high molecular material. The backboard is easy to deform during use. The support part of photovoltaic junction box will extrude the encapsulation film and the cell piece through the backboard, and the cell piece is easy to be cracked by extrusion.

[0004] The information disclosed in this section of background art is only intended to increase the understanding of the overall background of the present utility model, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. CONTENT OF UTILITY MODEL

[0005] The utility model aims to provide a kind of photovoltaic junction box, it is used to solve the problem that the cell piece of single-glass module is easy to be cracked by photovoltaic junction box.

[0006] In order to achieve the above-mentioned purpose, one embodiment of the utility model provides a kind of photovoltaic junction box, which is applied to photovoltaic module. The photovoltaic module includes a plurality of cell strings distributed along a first direction. Each cell string includes a plurality of cell pieces distributed along a second direction. A piece gap for accommodating a busbar is formed between any two adjacent cell pieces in the same cell string. The photovoltaic junction box includes a box body. The box body includes a first surface and a second surface arranged oppositely. The first surface includes a first region facing the piece gap and a second region facing the cell piece. At least one support part is arranged on the first region.

[0007] In one or more embodiments of the utility model, the support part includes a first support part and a second support part distributed along the first direction.

[0008] In one or more embodiments of the utility model, the distance between the first support part and the reference line is L1. The projection area of the first support part on the first surface of the box body is S1. The distance between the second support part and the reference line is L2. The projection area of the second support part on the first surface of the box body is S2. The reference line is the central axis extending along the second direction on the first surface. L1, L2, S1 and S2 satisfy: when L1 < L2, S1 > S2; when L1 = L2, S1 = S2.

[0009] In one or more embodiments of the present application, the distance L1 between the first support part and the reference line is less than the distance L2 between the second support part and the reference line, the first support part comprises at least one support block in the second direction, and the second support part comprises a plurality of support points spaced in the second direction.

[0010] In one or more embodiments of the present application, the width of the support block in the first direction is 1.4mm-1.6mm.

[0011] In one or more embodiments of the present application, the length of the support block in the second direction is 1.4mm-6mm.

[0012] In one or more embodiments of the present application, the height of the support block is 0.5mm-0.6mm.

[0013] In one or more embodiments of the present application, the length of the support point in the first direction is 1.4mm-1.6mm.

[0014] In one or more embodiments of the present application, the length of the support point in the second direction is 1.4mm-1.6mm.

[0015] In one or more embodiments of the present application, the height of the support point is 0.5mm-0.6mm.

[0016] In one or more embodiments of the present application, at least one anti-toppling part is arranged on the second region.

[0017] In one or more embodiments of the present application, the support block is a hollow structure.

[0018] In one or more embodiments of the present application, the projection area of the at least one support part on the first surface of the box body is greater than the projection area of the at least one anti-toppling part on the first surface of the box body.

[0019] In one or more embodiments of the present application, the projection area of the at least one support part on the first surface of the box body is greater than the projection area of any anti-toppling part on the first surface of the box body.

[0020] In one or more embodiments of the present application, the height of the support part is greater than or equal to the height of the anti-toppling part.

[0021] In one or more embodiments of the present application, the height difference between the support part and the anti-toppling part is less than or equal to 0.1mm.

[0022] The utility model discloses still another aspect provides a junction box assembly, this junction box assembly includes positive pole junction box, intermediate junction box and negative pole junction box, positive pole junction box, intermediate junction box and negative pole junction box all adopt above-mentioned photovoltaic junction box.

[0023] The utility model discloses still another aspect provides a photovoltaic assembly, this photovoltaic assembly includes the cover plate that sets up in turn, first encapsulation adhesive film, a plurality of cell series, second encapsulation adhesive film and backboard, and the photovoltaic assembly still includes above-mentioned junction box assembly, and the junction box assembly is connected on backboard.

[0024] In one or more embodiments of the utility model, the photovoltaic assembly further includes a busbar encapsulated in the inter-sheet gap of the cell string, and a vertical projection of the support portion on the backboard is located within a vertical projection of the busbar on the backboard.

[0025] In one or more embodiments of the utility model, the busbar includes a first busbar, a second busbar, a third busbar and a fourth busbar spaced apart along a first direction.

[0026] In one or more embodiments of the utility model, a vertical projection of one of the first support portion and the second support portion of the positive pole junction box is located within a vertical projection of the first busbar on the backboard, and a vertical projection of the other is located within a vertical projection of the second busbar on the backboard.

[0027] In one or more embodiments of the utility model, a vertical projection of one of the first support portion and the second support portion of the intermediate junction box is located within a vertical projection of the second busbar on the backboard, and a vertical projection of the other is located within a vertical projection of the third busbar on the backboard.

[0028] In one or more embodiments of the utility model, a vertical projection of one of the first support portion and the second support portion of the negative pole junction box is located within a vertical projection of the third busbar on the backboard, and a vertical projection of the other is located within a vertical projection of the fourth busbar on the backboard.

[0029] Compared with the prior art, the support portion of the utility model is arranged on the first region of the first surface of the photovoltaic junction box, which can reduce the probability of cell sheet cracking caused by the extrusion of the support portion when the photovoltaic junction box is connected to the backboard. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0031] Figure 1 It is a side view structure diagram of the photovoltaic junction box in the embodiment one of the present application.

[0032] Figure 2 It is a plane structure diagram of the first surface in the embodiment one of the present application.

[0033] Figure 3 It is a plane structure diagram of the first surface in the embodiment two of the present application.

[0034] Figure 4 It is a plane structure diagram of the first surface in the embodiment three of the present application.

[0035] Figure 5 It is a plane structure diagram of the junction box assembly in the embodiment four of the present application and the photovoltaic assembly in the embodiment five.

[0036] Figure 6 It is Figure 5 A partial enlarged view of part A in the embodiment.

[0037] Figure 7 It is Figure 5 A partial enlarged view of part B in the embodiment.

[0038] Figure 8 It is Figure 5 A partial enlarged view of part C in the embodiment.

[0039] Main figure mark explanation: 100, photovoltaic junction box, 110, box body, 111, first surface, 1111, first area, 1112, second area, 112, second surface, 113, first opening, 114, second opening, 115, reference line, 120, support part, 121, first support part, 122, second support part, 130, anti-toppling part, 200, positive junction box, 300, intermediate junction box, 400, negative junction box, 500, battery string, 510, battery piece, 520, piece gap, 600, first busbar, 700, second busbar, 800, third busbar, 900, fourth busbar. DETAILED DESCRIPTION

[0040] In order to make the technical scheme in the present application better understood, the technical scheme in the present application will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0041] In the description of the present application, it should be understood that the terms "top", "bottom", "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0042] The term "first direction" is the distribution direction of the plurality of cell strings of the photovoltaic module, the term "second direction" is the distribution direction of the plurality of cell pieces of each cell string, the "first direction" is perpendicular to the "second direction", and the term "reference line" is the central axis extending along the second direction on the first surface of the box body.

[0043] The terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0044] Embodiment one

[0045] Referring to Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8 , the present embodiment provides a photovoltaic junction box 100 applied to a photovoltaic module, the photovoltaic module comprising a plurality of cell strings 500 distributed along a first direction, the cell string 500 comprising a plurality of cell pieces 510 distributed along a second direction, and a piece gap 520 for accommodating a bus bar is formed between two adjacent cell pieces 510 in the same cell string 500.

[0046] The photovoltaic junction box 100 of the embodiment comprises a box body 110 and a plurality of support portions 120. The box body 110 comprises a first surface 111 and a second surface 112 arranged oppositely. The first surface 111 is used to be adhered to the back plate of the photovoltaic module by the adhesive. The first surface 111 comprises a first region 1111 and a second region 1112. When the photovoltaic junction box 100 is connected to the back plate, the first region 1111 faces the inter-cell gap 520, and the second region 1112 faces the cell 510. The plurality of support portions 120 are arranged on the first region 1111 of the first surface 111.

[0047] Referring to Figure 2 and Figure 8 When the photovoltaic junction box 100 of the embodiment is adhered to the back plate, the support portions 120 are used to contact the back plate, to separate the first surface 111 from the back plate, and to facilitate the adhesive to be filled between the first surface 111 and the back plate. In addition, the projection of the support portions 120 on the surface of the back plate avoids the area where the cell 510 is located, so that the support portions 120 do not transmit the extrusion force of the box body 110 to the cell 510, and the probability of the cell 510 being cracked is reduced.

[0048] Referring to Figure 1 and Figure 2 The photovoltaic junction box 100 of the embodiment comprises a plurality of support portions 120 distributed along the first direction. The contact area of the support portions 120 with the back plate is appropriately increased, and the support strength of the support portions 120 to the box body 110 is enhanced. After the support portions 120 contact the back plate, the probability of the box body 110 being inclined is reduced, and the installation accuracy of the photovoltaic junction box 100 is improved.

[0049] Further, the photovoltaic junction box 100 of the embodiment comprises a first support portion 121 and a second support portion 122. The first support portion 121 and the second support portion 122 are arranged along the first direction and are respectively located on two sides of the reference line 115.

[0050] Further, the box wall where the first surface 111 is located is provided with a first opening 113 and a second opening 114. The first opening 113 is used for the bus bar to pass into the box body 110 and to be connected to the diode module installed in the box body 110. The second opening 114 is provided with a clamp. The clamp is used to fix the cable which passes into the box body 110 and is connected to the diode module. The first opening 113 and the second opening 114 are generally not symmetrically distributed along the reference line 115, and also occupy part of the space of the first region 1111, so that the first support portion 121 and the second support portion 122 cannot be symmetrically distributed along the reference line 115.

[0051] Specifically, the distance between the first support portion 121 and the baseline 115 is L1, and the distance between the second support portion 122 and the baseline 115 is L2. The first support portion 121 and the second support portion 122 are configured to satisfy L1 < L2.

[0052] Since the second support portion 122 is closer to the edge of the housing 110 than the first support portion 121, the contact area between the second support portion 122 and the backplate cannot be too large in order to facilitate the overflow of excess adhesive between the first surface 111 and the backplate when the photovoltaic junction box 100 is connected to the backplate. Meanwhile, since the first support portion 121 is closer to the reference line 115 of the first surface 111, i.e., closer to the geometric center of the housing 110, even if the contact area between the first support portion 121 and the backplate is large, it will not significantly affect the overflow of adhesive from the edge of the housing 110. On the contrary, the larger contact area between the first support portion 121 and the backplate can further disperse the compressive force exerted by the housing 110 on the backplate by the support portion 120, thereby reducing the probability of cell cracking in the solar cell 510.

[0053] For the reasons mentioned above, the projected area of ​​the first support portion 121 on the first surface 111 is S1, and the projected area of ​​the second support portion 122 on the first surface 111 is S2. The first support portion 121 and the second support portion 122 are configured to satisfy S1 > S2.

[0054] Reference Figure 1 and Figure 2 As shown, the first support portion 121 in this embodiment includes a support block that extends along a first direction and is constructed as a long strip-shaped block structure.

[0055] Furthermore, the width of the support block in the first direction is L3, 1.4mm≤L3≤1.6mm, and L3 can be specifically set to 1.4mm, 1.5mm or 1.6mm.

[0056] The length of the support block in the second direction is L4, 1.4mm≤L4≤6mm, and L4 can be specifically set to 4mm, 5mm or 6mm.

[0057] The height of the support block is 0.5mm-0.6mm, and can be set to 0.5mm or 0.6mm.

[0058] In other alternative embodiments, the shape of the support block can also be adapted, and its shape is not limited to a long strip. Those skilled in the art can construct the support block into any shape that can support the box 110 according to the actual situation. Furthermore, the first support portion 121 can also be composed of two or more support blocks distributed along the second direction.

[0059] ReferenceFigure 1 and Figure 2 As shown in FIG. 12, the second support part 122 in the embodiment includes two support points distributed along the second direction, each of which is configured as a point-like protruding structure. The gap between the two support points can be used for the gel to pass through, facilitating the overflow of the excess gel between the first surface 111 and the back plate from the edge of the box body 110 when the photovoltaic junction box 100 is connected to the back plate.

[0060] Further, the support points are configured as cylindrical protruding structures, the diameter of the cross section of the support points is between 1.4 mm and 1.6 mm, the length L5 of the support points in the first direction and the length L6 of the support points in the second direction are equal to the diameter of the cross section, and the diameter of the cross section can be specifically set to 1.4 mm, 1.5 mm or 1.6 mm.

[0061] The height of the support points is between 0.5 mm and 0.6 mm, and can be specifically set to 0.5 mm or 0.6 mm.

[0062] In other alternative embodiments, the shape of the support points can also be adjusted adaptively, and the shape of the support points is not limited to a circular point-like structure. Those skilled in the art can configure the support points into any shape that can support the box body 110 according to the actual situation, as long as the length L5 of the support points in the first direction and the length L6 of the support points in the second direction are both between 1.4 mm and 1.6 mm. In addition, the second support part 122 can also be composed of more than three support points distributed along the second direction. Alternatively, the second support part 122 can also be composed of only one support point.

[0063] Referring to FIG. 13, Figure 1 As shown in FIG. 13, the first surface 111 in the embodiment is a plane, and the height of the support block and the support points is equal.

[0064] In other alternative embodiments, when the first surface 111 is uneven, the height of the support block and the support points can be adjusted adaptively to ensure that the support block and the support points can be in contact with and abut against the back plate when the photovoltaic junction box 100 is connected to the back plate.

[0065] Referring to FIG. 14, Figure 1 and Figure 2 As shown in FIG. 14, two second regions 1112 are formed on the first surface 111 in the embodiment, and the two second regions 1112 are distributed on both sides of the first region 1111 along the second direction. The photovoltaic junction box 100 further includes a plurality of anti-toppling parts 130 arranged in the two second regions 1112, and each second region 1112 is provided with two anti-toppling parts 130 arranged along the first direction. The four anti-toppling parts 130 in the two second regions 1112 are substantially distributed at the four corners of the rectangle.

[0066] Further, the height L7 of the supporting portion 120 is greater than the height L8 of the anti-toppling portion 130. When the supporting portion 120 is in contact with the back plate, there is a gap between the anti-toppling portion 130 and the back plate. When the supporting force provided by the supporting portion 120 is insufficient to ensure that the first surface 111 is parallel to the back plate, the box body 110 will tilt in a certain direction. After the box body 110 tilts by a small angle, the anti-toppling portion 130 can be in contact with the back plate, providing additional supporting force to the box body 110 to prevent the box body 110 from further tilting and limit the tilting angle of the box body 110 to a small range.

[0067] Further, to ensure that the anti-toppling portion 130 can effectively prevent tilting when the box body 110 tilts, the height difference between the supporting portion 120 and the anti-toppling portion 130 should be controlled within a reasonable range. The height of the anti-toppling portion 130 should not be too small to ensure that the anti-toppling portion 130 can be in contact with the surface of the back plate when the box body 110 tilts. Specifically, the height difference between the supporting portion 120 and the anti-toppling portion 130 should be less than or equal to 0.1 mm.

[0068] In other alternative embodiments, the heights of the supporting portion 120 and the anti-toppling portion 130 are the same. The supporting portion 120 can still disperse a portion of the pressing force to the sheet gap 520, reducing the pressing force applied to the back plate and the battery sheet 510 and reducing the probability of sheet cracking of the battery sheet 510.

[0069] In the present embodiment, the projected area of the first supporting portion 121 on the first surface 111 of the box body 110 is greater than the projected area of any one anti-toppling portion 130 on the first surface 111 of the box body 110. Even when the heights of the first supporting portion 121 and the anti-toppling portion 130 are the same, the first supporting portion 121 can still disperse most of the pressing force to the sheet gap 520, further reducing the probability of sheet cracking of the battery sheet 510.

[0070] In other alternative embodiments, when the heights of the supporting portion 120 and the anti-toppling portion 130 are the same, the projected area of the second supporting portion 122 on the first surface 111 of the box body 110 can be adaptively increased so that it is greater than the projected area of any one anti-toppling portion 130 on the first surface 111 of the box body 110. This further increases the contact area of all supporting portions 120 with the back plate and further reduces the probability of sheet cracking of the battery sheet 510.

[0071] In other alternative embodiments, when the heights of the support portion 120 and the anti-tipping portion 130 are equal, the projected area of ​​part of the support portion 120 on the first surface 111 of the box body 110 can be adaptively reduced. However, it should be ensured that the projected area of ​​at least one support portion 120 on the first surface 111 of the box body 110 is greater than the projected area of ​​at least one anti-tipping portion 130 on the first surface 111 of the box body 110, so as to avoid the support portion 120 having too small a contact area with the back plate, which would affect its ability to disperse the compressive force at the sheet gap 520.

[0072] Example 2

[0073] Reference Figure 3 As shown, this embodiment provides a photovoltaic junction box. The difference from the first embodiment is that the support block of the first support part 121 in this embodiment has a hollow structure. Several holes for the colloid to pass through are formed on the first support part 121 to avoid the first support part 121 blocking the flow of the colloid around it, and to ensure that the colloid can diffuse to various areas of the first surface 111.

[0074] In other alternative embodiments, the second support portion 122 may also be configured as a hollow structure.

[0075] Example 3

[0076] Reference Figure 4 As shown, this embodiment provides a photovoltaic junction box. The difference from the first embodiment is that the first surface 111 of this embodiment is provided with only a first opening 113 for the busbar to pass into the box body 110. The first opening 113 is relatively centrally located and is basically symmetrically arranged along the baseline 115. The first support part 121 and the second support part 122 are also symmetrically arranged along the baseline 115.

[0077] Specifically, the distance between the first support portion 121 and the baseline 115 is L1, and the distance between the second support portion 122 and the baseline 115 is L2. The first support portion 121 and the second support portion 122 are configured to satisfy L1 = L2.

[0078] Furthermore, the contact area between the first support portion 121 and the back plate is equal to the contact area between the second support portion 122 and the back plate.

[0079] Specifically, the area of ​​the first support portion 121 on the first surface 111 is S1, and the projected area of ​​the second support portion 122 on the first surface 111 is S2. The first support portion 121 and the second support portion 122 are configured to satisfy S1 = S2.

[0080] Reference Figure 4As shown, the first support part 121 and the second support part 122 of the embodiment have the same shape and structure, and each of the first support part 121 and the second support part 122 is composed of two support points spaced apart along the second direction.

[0081] Embodiment Four

[0082] With reference to Figures 5 to 8 As shown, the embodiment provides a junction box assembly, which includes a positive junction box 200, a negative junction box 400 and an intermediate junction box 300, the positive junction box 200 and the negative junction box 400 each adopt the photovoltaic junction box 100 in Embodiment One or Embodiment Two, and the intermediate junction box 300 adopts the photovoltaic junction box 100 in Embodiment Three.

[0083] In other alternative embodiments, if the shape of the box body 110, the position of the first opening 113 and the position of the second opening 114 in Embodiment One and Embodiment Two are adaptively adjusted so that the first support part 121 and the second support part 122 can be symmetrically arranged along the reference line 115, the positive junction box 200 and the negative junction box 400 can also adopt the photovoltaic junction box 100 in Embodiment Three.

[0084] In other alternative embodiments, if the shape of the box body 110 and the position of the first opening 113 in Embodiment One are adaptively adjusted so that the first support part 121 and the second support part 122 cannot be symmetrically arranged along the reference line 115, the intermediate junction box 300 can also adopt the photovoltaic junction box 100 in Embodiment One or Embodiment Two.

[0085] Embodiment Five

[0086] With reference to Figures 5 to 8 As shown, the embodiment provides a photovoltaic assembly, which includes a cover plate, a first encapsulation adhesive film, a plurality of cell strings 500, a second encapsulation adhesive film, a back plate, a busbar and the junction box assembly in Embodiment Three, which are sequentially stacked.

[0087] Specifically, the cover plate, the first encapsulation adhesive film, the plurality of cell strings 500, the second encapsulation adhesive film and the back plate are sequentially stacked, the busbar is encapsulated in the inter-sheet gap 520 of the cell string 500, and the length of the inter-sheet gap 520 in the second direction is not greater than 11 mm. The junction box assembly is connected to the back plate, and the vertical projection of all the support parts 120 in the junction box assembly on the back plate is located within the vertical projection of the busbar on the back plate.

[0088] Further, the busbar of the embodiment includes a first busbar 600, a second busbar 700, a third busbar 800 and a fourth busbar 900, which are spaced apart along the first direction.

[0089] The vertical projection of the first supporting part 121 of the positive terminal box 200 on the back plate is located within the vertical projection of the first bus bar 600 on the back plate, the vertical projection of the second supporting part 122 of the positive terminal box 200 on the back plate is located within the vertical projection of the second bus bar 700 on the back plate, and the first bus bar 600 and the second bus bar 700 are both arranged in the positive terminal box 200 and connected with the diode module inside the positive terminal box 200.

[0090] The vertical projection of the first supporting part 121 of the intermediate terminal box 300 on the back plate is located within the vertical projection of the second bus bar 700 on the back plate, the vertical projection of the second supporting part 122 of the intermediate terminal box 300 on the back plate is located within the vertical projection of the third bus bar 800 on the back plate, and the second bus bar 700 and the third bus bar 800 are both arranged in the intermediate terminal box 300 and connected with the diode module inside the intermediate terminal box 300.

[0091] The vertical projection of the first supporting part 121 of the negative terminal box 400 on the back plate is located within the vertical projection of the fourth bus bar 900 on the back plate, the vertical projection of the second supporting part 122 of the negative terminal box 400 on the back plate is located within the vertical projection of the third bus bar 800 on the back plate, and the third bus bar 800 and the fourth bus bar 900 are both arranged in the negative terminal box 400 and connected with the diode module inside the negative terminal box 400.

[0092] In other alternative embodiments, the positions of the first supporting part 121 and the second supporting part 122 of the positive terminal box 200, the intermediate terminal box 300 and the negative terminal box 400 can be interchanged.

[0093] It is apparent for those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than that of the above description, and it is intended to embrace all changes and modifications that fall within the meaning and scope of equivalents of the claims. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0094] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A photovoltaic junction box applied to a photovoltaic module, the photovoltaic module comprising a plurality of cell strings distributed along a first direction, each of the cell strings comprising a plurality of cell pieces distributed along a second direction, a piece gap in which a bus bar is accommodated being formed between two adjacent cell pieces in the same cell string, characterized in that, The photovoltaic junction box comprises a box body, the box body comprises oppositely arranged first and second surfaces, the first surface comprises a first region facing the intercell gap and a second region facing the cell sheet, and the first region is provided with at least one support part.

2. The photovoltaic junction box of claim 1, wherein, The support part comprises a first support part and a second support part distributed along a first direction.

3. The photovoltaic junction box of claim 2, wherein, The distance between the first support part and a reference line is L1, the projected area of the first support part on the first surface of the box body is S1, the distance between the second support part and the reference line is L2, and the projected area of the second support part on the first surface of the box body is S2, the reference line is a central axis extending along a second direction on the first surface, and L1, L2, S1 and S2 satisfy: When L1 < L2, S1 > S2; When L1 = L2, S1 = S2.

4. The photovoltaic junction box of claim 2, wherein, The distance L1 between the first support part and the reference line is less than the distance L2 between the second support part and the reference line, the first support part comprises at least one support block along the second direction, and the second support part comprises a plurality of support points distributed along the second direction.

5. The photovoltaic junction box of claim 4, wherein, The width of the support block in the first direction is 1.4-1.6 mm; and / or, The length of the support block in the second direction is 1.4-6 mm; and / or, The height of the support block is 0.5-0.6 mm; and / or, The support block is a hollow structure; and / or, The length of the support point in the first direction is 1.4-1.6 mm; and / or, The length of the support point in the second direction is 1.4-1.6 mm; and / or, The height of the support point is 0.5-0.6 mm.

6. The photovoltaic junction box of claim 1, wherein, At least one anti-toppling part is arranged on the second region.

7. The photovoltaic junction box of claim 6, wherein, The projected area of at least one support part on the first surface of the box body is greater than the projected area of at least one anti-toppling part on the first surface of the box body.

8. The photovoltaic junction box of claim 7, wherein, The projected area of at least one support part on the first surface of the box body is greater than the projected area of any one anti-toppling part on the first surface of the box body.

9. The photovoltaic junction box of claim 6, wherein, The height of the support part is greater than or equal to the height of the anti-toppling part.

10. The photovoltaic junction box of claim 9, wherein, The height difference between the support part and the anti-toppling part is less than or equal to 0.1 mm.

11. A junction box assembly characterized by, The junction box assembly comprises a positive junction box, an intermediate junction box and a negative junction box, and the positive junction box, the intermediate junction box and the negative junction box all adopt the photovoltaic junction box according to any one of claims 1-10.

12. A photovoltaic module, characterized by The photovoltaic assembly comprises a cover plate, a first encapsulation film, a plurality of cell strings, a second encapsulation film and a back plate arranged in sequence; The photovoltaic assembly further comprises the junction box assembly according to claim 11, and the junction box assembly is connected to the back plate.

13. The photovoltaic module of claim 12, wherein, The photovoltaic assembly further comprises a busbar encapsulated in the intercell gap of the cell string, and the vertical projection of the support part on the back plate is located in the vertical projection of the busbar on the back plate.

14. The photovoltaic module of claim 13, wherein, The busbar comprises first, second, third and fourth busbars distributed along the first direction. A vertical projection of one of the first support part and the second support part of the positive electrode terminal block is located within a vertical projection of the first busbar on the back plate, and a vertical projection of the other is located within a vertical projection of the second busbar on the back plate; A vertical projection of one of the first support part and the second support part of the intermediate terminal block is located within a vertical projection of the second busbar on the back plate, and a vertical projection of the other is located within a vertical projection of the third busbar on the back plate; A vertical projection of one of the first support part and the second support part of the negative electrode terminal block is located within a vertical projection of the third busbar on the back plate, and a vertical projection of the other is located within a vertical projection of the fourth busbar on the back plate.

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