Junction box and three-split junction box photovoltaic module

Abstract

The utility model provides a junction box structure and a three-split junction box photovoltaic assembly, relates to the technical field of photovoltaics, and solves the technical problems that a heat dissipation sealant and the inner wall of a junction box are not firmly adhered, and a gap is easy to exist or the heat dissipation sealant and the inner wall of the junction box are separated from each other. The junction box structure comprises a box body, the box body is provided with a side wall and a bottom wall, the side wall and the bottom wall form an inner cavity for accommodating a bypass module, the bottom wall is provided with a supporting structure for bearing the bypass module, the bottom wall is provided with more than two glue overflowing grooves, and the glue overflowing grooves are at least located between the side wall of the box body and the supporting structure and penetrate through the bottom wall. The glue can enter the glue overflowing groove when being poured into the inner cavity, so that the contact area between the glue and the box body is increased, the glue is firmly fixed to the box body, the gap between the glue and the box body is reduced, and water vapor is prevented from entering the box body.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a junction box and a three-part junction box photovoltaic assembly. Background Art

[0002] The photovoltaic junction box is a key electrical protection component in solar photovoltaic power generation systems, performing multiple functions, including connection, protection, and bypass protection. Its basic functions include circuit connection and protection. It uses cables and connectors to channel the current generated by the solar panels to the electrical equipment, ensuring that the electrical resistance and contact resistance of the conductive materials are as low as possible to minimize losses. The junction box also has a built-in bypass circuit that activates when the solar cells experience hot spots or partial shading, minimizing power loss.

[0003] The photovoltaic junction box needs to be filled with heat dissipation sealant to prevent moisture from entering the box and causing a short circuit in the bypass circuit.

[0004] The applicant has discovered that the existing technology has at least the following technical problems: on the one hand, after the heat dissipation sealant is poured into the junction box, the heat dissipation sealant is not firmly adhered to the inner wall of the junction box, and gaps are easily formed. After long-term operation, water vapor can easily enter the box body, causing the bypass circuit to short-circuit and fail to work; on the other hand, the junction box and some fixed parts such as the photovoltaic module backplane are not firmly bonded, which seriously affects the heat dissipation and use of the bypass circuit. Utility Model Content

[0005] The purpose of the present invention is to provide a junction box and a three-part junction box photovoltaic module to solve the technical problems in the prior art of poor adhesion between the heat dissipation sealant and the inner wall of the junction box, easy existence of gaps or separation from each other; the many technical effects that can be produced by the preferred technical solution among the many technical solutions provided by the present invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The junction box structure provided by the present invention includes a box body having side walls and a bottom wall. The side walls and the bottom wall form an inner cavity for accommodating a bypass module. A support structure for carrying the bypass module is provided on the bottom wall, wherein:

[0008] The bottom wall is provided with two or more glue overflow grooves, and the glue overflow grooves are at least located between the side wall of the box body and the supporting structure and pass through the bottom wall.

[0009] Preferably, the glue overflow groove includes a first groove section and a second groove section, the first groove section is located on the bottom wall; the second groove section is located in the connecting area between the side wall and the bottom wall, and is communicated with the first groove section.

[0010] Preferably, the second groove section has an opening on the side wall facing the inner cavity, and a groove side wall and a groove bottom located inside the side wall.

[0011] Preferably, along a direction perpendicular to the bottom wall of the box body, a groove side wall of the second groove section away from the bottom wall is higher than the upper surface of the bottom wall.

[0012] Preferably, the glue overflow grooves are arranged on one side or two opposite sides of the support structure, and the glue overflow grooves on the same side are arranged at intervals.

[0013] Preferably, a glue guiding structure is provided on the support structure, and the glue guiding structure includes a glue guiding groove, which is connected to the inner cavity, and the glue guiding groove includes two connected conical grooves, which extend toward the inner cavity and gradually shrink along the extension direction.

[0014] Preferably, the glue guiding structure further includes a first glue guiding hole and a second glue guiding hole, wherein the first glue guiding hole and the second glue guiding hole are both connected to the inner cavity and are respectively located on opposite sides of the glue guiding groove;

[0015] In the glue guiding groove, a connecting section exists between the two sections of the tapered grooves, and a third glue guiding hole communicating with the inner cavity is provided on the connecting section.

[0016] Preferably, the box body is provided with a wire clamping groove and a positive and negative pole identification portion on opposite sides thereof;

[0017] Alternatively, a hand-held portion is provided on one side of the box body, and a cylindrical component is provided on the hand-held portion to increase the contact area when holding the box.

[0018] The present invention also provides a three-part junction box photovoltaic assembly, comprising a negative junction box, an intermediate junction box and a positive junction box. The negative junction box and / or the intermediate junction box and / or the positive junction box adopt the above-mentioned junction box structure, and a bypass module is fixed in the negative junction box, the intermediate junction box and the positive junction box.

[0019] Preferably, the bypass module includes a plastic-sealed body, a positive conductive member, a negative conductive member and a rivet cup, wherein: the positive conductive member and the negative conductive member both have a busbar through-hole and a fixing hole corresponding to the fixing structure; one end of the positive conductive member is plastic-sealed in the plastic-sealed body, and the other end is connected to the corresponding rivet cup; one end of the negative conductive member is plastic-sealed in the plastic-sealed body, and the other end is connected to the corresponding rivet cup; the rivet cup is used to connect to a cable; the busbar through-holes of the positive conductive member and the negative conductive member are respectively located on opposite sides of the plastic-sealed body.

[0020] The junction box structure and three-part junction box photovoltaic module provided by the present invention have the following beneficial effects compared with the prior art: since the glue overflow groove is located between the side wall and the supporting structure of the box body and penetrates the bottom wall, the glue overflow groove does not interfere with the glue guide structure. When the glue is poured into the inner cavity, it can enter the glue overflow groove, thereby increasing the contact area between the glue and the box body, firmly fixing the glue to the box body, preventing the glue from separating from the box body, reducing the gap between the glue and the box body, and thus preventing water vapor from entering the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the photovoltaic junction box assembly;

[0023] Figure 2 This is a schematic diagram of the internal structure of the intermediate junction box;

[0024] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle;

[0025] Figure 4 It is a structural diagram of the negative terminal box;

[0026] Figure 5 Schematic diagram of the bypass module from top view;

[0027] Figure 6 1 is a schematic diagram of the side structure of the bypass module;

[0028] Figure 7 This is a schematic diagram of the internal structure of the negative terminal box and the bypass module;

[0029] Figure 8 This is a schematic diagram of the internal structure of the intermediate junction box and the bypass module;

[0030] Figure 9 This is a schematic diagram of the internal structure of the positive terminal box and the bypass module;

[0031] Figure 10 1 is a schematic structural diagram of the support structure of the negative terminal box;

[0032] Figure 11 It is a structural diagram of the supporting structure of the intermediate junction box;

[0033] Figure 12 It is a structural diagram of the support structure of the positive terminal box.

[0034] In the figure, 1 is the box body; 2 is the cover; 3 is the bypass module; 30 is the plastic package; 31 is the positive conductive part; 32 is the negative conductive part; 33 is the busbar perforation; 34 is the fixing hole; 35 is the rivet cup; 36 is the welding pad; 4 is the supporting structure; 40 is the glue overflow groove; 401 is the first groove section; 402 is the second groove section; 41 is the glue guide groove; 411 is the tapered groove; 42 is the first glue guide hole; 43 is the second glue guide hole; 431 is the first hole position; 432 is the second hole position; 44 is the third glue guide hole; 5 is the negative terminal box; 6 is the middle terminal box; 7 is the positive terminal box; 90 is the wire clamping groove; 91 is the foot pad; 92 is the positive identification part; 93 is the negative identification part; 94 is the hand-held part; 95 is the cylindrical part. DETAILED DESCRIPTION

[0035] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center," "length," "width," "height," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and "side" and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0037] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0038] The embodiments of the utility model provide a junction box and a three-part junction box photovoltaic assembly, which prevent the colloid from separating from the box body and reduce the gap between the colloid and the box body, thereby preventing water vapor from entering the box body.

[0039] The following combination Figures 1-12 The technical solution provided by the utility model is described in more detail.

[0040] Embodiment 1:

[0041] See also Figure 2 、 Figure 3 、 Figure 10-12 As shown, the junction box provided by the present invention includes a box body 1, the box body 1 has side walls and a bottom wall, the side walls and the bottom wall form an inner cavity for accommodating the bypass module 3, and a support structure 4 for carrying the bypass module 3 is provided on the bottom wall: more than two overflow glue grooves 40 are provided on the support structure 4, and the overflow glue groove 40 is located between the side walls of the box body 1 and the support structure 4, and passes through the bottom wall.

[0042] The glue overflow groove 40 passes through the bottom wall and is connected to the inner cavity of the box body 1 . The heat dissipation sealant is filled in the glue overflow groove 40 . The heat dissipation sealant filled in the glue overflow groove 40 can improve the bonding stability with the box body 1 .

[0043] As an alternative embodiment, see Figure 2 and Figure 3 As shown, the overflow groove 40 includes a first groove section 401 and a second groove section 402. The first groove section 401 is located on the bottom wall; the second groove section 402 is located in the area where the side wall and the bottom wall connect and is connected to the first groove section 401. The second groove section 402 has an opening on the side wall facing the inner cavity, and groove sidewalls and a groove bottom located within the side wall.

[0044] See also Figure 3 As shown, along the direction perpendicular to the bottom wall of the box body 1, a groove side wall of the second groove section 402 away from the bottom wall is higher than the upper surface of the bottom wall, so that the glue can form a hook-shaped structure after filling, preventing the glue from separating from the box body.

[0045] When the heat dissipation sealant is cured, the cured colloid forms a hook-shaped structure in the overflow groove 40. The hook portion is provided on the side wall of the box body 1. The cured colloid is snap-fitted and fixed in the box body 1. The colloid is difficult to separate from the inner wall of the box body 1, thereby preventing a gap between the box body 1 and the colloid.

[0046] See also Figure 2 The glue overflow grooves 40 are arranged on one side or two opposite sides of the support structure 4, and the glue overflow grooves 40 on the same side are arranged at intervals.

[0047] In this embodiment, specifically, the potting glue may be a heat dissipation sealant, which can completely fill the inner cavity of the box body 1 , thereby facilitating heat dissipation and sealing within the box body 1 .

[0048] In the junction box structure provided by the present invention, since the first groove section 401 and the second groove section 402 of the glue overflow groove 40 are opened on the adjacent two side walls of the box body 1, the glue can enter the glue overflow groove 40 when poured into the inner cavity, and form a hook-shaped structure in the glue overflow groove 40. After the glue solidifies, the hook-shaped structure hooks the side wall of the box body 1, and the solidified glue is snap-fitted and fixed to the side wall of the box body 1, firmly fixed to the box body 1, preventing the glue from separating from the side wall of the box body 1, reducing the gap between the glue and the box body 1, and thus preventing water vapor from entering the box body 1.

[0049] The junction box structure of this embodiment can be applied to photovoltaic junction box components. Figure 4 As shown, the existing photovoltaic junction box assembly includes a positive junction box 7, an intermediate junction box 6 and a negative junction box 5. The positive junction box 7, the intermediate junction box 6 and the negative junction box 5 can all adopt the above-mentioned junction box structure to prevent water vapor from entering the box body 1.

[0050] When the junction box structure is used in a photovoltaic junction box assembly, the support structure 4 is bonded to the backsheet of the photovoltaic assembly. In other words, the "part to be fixed" in this case is the backsheet of the photovoltaic assembly. Of course, the "part to be fixed" can also be other panels or devices, and this is not limited here.

[0051] As an alternative embodiment, see Figure 2 、 Figure 10-12 As shown, a plurality of glue overflow grooves 40 are arranged on one side or two opposite sides of the support structure 4 , and there is a distance between adjacent glue overflow grooves 40 on the same side.

[0052] The glue overflow grooves 40 are spaced apart on one side or two opposite sides of the support structure 4 , which can further improve the connection stability between the heat dissipation sealant and the box body 1 , and improve the bonding stability between the box body 1 and the part to be fixed.

[0053] All the overflow glue grooves 40 on the same side are on the same straight line for easy processing. Alternatively, all the overflow glue grooves 40 on the same side are on different straight lines or curves; or, the overflow glue grooves 40 are distributed in a matrix.

[0054] The size of the overflow glue groove 40 is not limited. Preferably, the length, width and height of the overflow glue groove 40 are 2.2*1.5*3 mm, or the length, width and height of the overflow glue groove 40 are 2.2*1.5*6 mm.

[0055] As an alternative embodiment, see Figure 11As shown, a foot 91 is provided on the support structure 4, and the foot 91 is located on the outer periphery of the support structure 4. The foot 91 protrudes from the surface of the support structure 4 and surrounds a groove structure. The overflow groove 40 is connected to the groove structure, and the groove structure is used to fill the adhesive glue, thereby adhering the support structure 4 to the part to be fixed.

[0056] The foot 91 and the support structure 4 can be an integrally formed structure, without the need for redundant connecting structures, thereby ensuring the stability of the structure.

[0057] When the box body 1 is adhered to the part to be fixed, adhesive is coated in the groove structure, and the heat dissipation sealant filled in the overflow groove 40 contacts the adhesive to improve the adhesion stability, thereby adhering the box body 1 to the part to be fixed.

[0058] When the junction box is actually installed, the support structure 4 of the box body 1 can be connected to the photovoltaic module using the foot 91, so that an insulating medium such as adhesive can be filled between the support structure 4 of the box body 1 and the photovoltaic module.

[0059] As an alternative embodiment, see Figure 4 As shown, the box body 1 of this embodiment includes a box body 11 and a cover 2. The cover 2 is closed on the side of the box body 11 away from the support structure 4. The box body 11 and the cover 2 are an integrated structure or a split structure. The junction box in this embodiment is a split junction box, see Figure 4 As shown, the photovoltaic junction box assembly includes a negative junction box 5 , a positive junction box 7 and an intermediate junction box 6 , and the cover 2 is installed in the box body 11 in an embedded manner.

[0060] As an alternative embodiment, see Figure 10-12 As shown, the glue guiding structure of this embodiment includes a glue guiding groove 41, which is connected to the inner cavity. The glue guiding groove 41 includes two connected tapered grooves 411, which extend toward the inner cavity and gradually shrink along the extending direction.

[0061] Specifically, the above structure of the tapered groove 411 facilitates the guiding of the busbar. One of the first glue guide hole 42 and the second glue guide hole 43 includes a first hole position 431 and a second hole position 432. In this embodiment, see Figure 11 The second glue guide hole 43 includes a first hole position 431 and a second hole position 432. The first hole position 431 and the second hole position 432 are separated by a connecting portion and are both connected to the inner cavity; when the heat dissipation sealant overflows the connecting portion between the first hole position 431 and the second hole position 432, the adhesion between the junction box and the photovoltaic module backplane can be enhanced.

[0062] In the glue guiding groove 41 , a connecting section exists between the two sections of the tapered groove 411 , and a third glue guiding hole 44 communicating with the inner cavity is provided on the connecting section.

[0063] As an alternative embodiment, see Figure 10-12 As shown, the glue guiding structure further includes a first glue guiding hole 42 and a second glue guiding hole 43 . The first glue guiding hole 42 and the second glue guiding hole 43 are both connected to the inner cavity and are respectively located on opposite sides of the glue guiding groove 41 .

[0064] See also Figure 10-12 The shapes of the first and second adhesive holes 42, 43 on the negative terminal box 5, the intermediate terminal box 6, and the positive terminal box 7 shown can be identical or different, without limitation herein, and can be configured as needed. The provision of the first and second adhesive holes 42, 43 not only facilitates the flow of adhesive but also reduces the weight of the box body 1, thereby reducing the load on the photovoltaic modules and lowering the cost of the box body 1.

[0065] As an alternative embodiment, see Figure 10 and Figure 12 As shown, on the negative terminal box 5 and the positive terminal box 7, the box body 1 is provided with a wire clamping groove 90 and a positive and negative identification portion 93 on opposite sides thereof; Figure 10 , the opposite ends of the negative terminal box 5 are provided with a wire clamping groove 90 and a negative identification portion 93, as shown in FIG. Figure 12 Wire clamping grooves 90 and positive electrode identification portions 92 are provided at opposite ends of the positive electrode junction box 7 .

[0066] The wire clamping groove 90 facilitates the clamping of cables, and the negative pole identification portion 93 and the positive pole identification portion 92 facilitate the user to quickly identify and distinguish between the positive and negative junction boxes.

[0067] See also Figure 11 As shown, on the intermediate junction box 6, a hand-holding portion 94 is provided on one side of the box body 1, and a cylindrical component 95 is provided on the hand-holding portion 94 to increase the contact area when holding. Optionally, the cylindrical component 95 is a hollow structure.

[0068] Example 2

[0069] This embodiment provides a three-part junction box photovoltaic module, see Figure 4 As shown, it includes a negative terminal box 5, an intermediate terminal box 6, and a positive terminal box 7. The negative terminal box 5 and / or the intermediate terminal box 6 and / or the positive terminal box 7 adopt the terminal box structure of the above-mentioned embodiment 1. The bypass module 3 is fixed in the negative terminal box 5, the intermediate terminal box 6, and the positive terminal box 7. One end of the negative terminal box 5 is electrically connected to the negative cable of the photovoltaic module, and one end of the positive terminal box 7 is electrically connected to the positive cable of the photovoltaic module, shortening the distance between the circuit connections of the solar panels during engineering installation.

[0070] In this embodiment, the negative terminal box 5, the intermediate terminal box 6, and the positive terminal box 7 adopt the terminal box structure of the above-mentioned embodiment 1. This can prevent the colloid from separating from the side wall of the box body 1, reduce the gap between the colloid and the box body 1, and thus prevent moisture from entering the box body 1.

[0071] As an alternative embodiment, see Figure 5 and Figure 8 、 Figure 9 As shown, the bypass module 3 includes a plastic package 30, a positive conductive member 31, a negative conductive member 32 and a rivet cup 35, wherein: the positive conductive member 31 and the negative conductive member 32 both have a busbar through-hole 33 and a fixing hole 34 corresponding to the fixing structure; one end of the positive conductive member 31 is plastic-sealed in the plastic package 30, and the other end is connected to the corresponding rivet cup 35; one end of the negative conductive member 32 is plastic-sealed in the plastic package 30, and the other end is connected to the corresponding rivet cup 35; the rivet cup 35 is used to connect to the cable; the busbar through-holes 33 of the positive conductive member 31 and the negative conductive member 32 are respectively located on opposite sides of the plastic package 30.

[0072] The plastic package 30 includes a diode chip or a bypass circuit including a MOS device, where MOS is the abbreviation of MOSFET, which stands for Metal-Oxide-Semiconductor Field-Effect Transistor.

[0073] See also Figure 10-12 As shown, the bypass module 3 can be directly installed into the box body 1, which facilitates installation and improves production efficiency. The busbar is positioned within the tapered groove 411 of the glue guide groove 41 and then welded to the bypass module 3. Specifically, the busbar is welded to the welding pad 36 on the positive conductive member 31 or the welding pad 36 on the negative conductive member 32.

[0074] In the description of this specification, specific features, structures, or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0076] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A junction box, characterized in that: The box body comprises a box body having side walls and a bottom wall, wherein the side walls and the bottom wall form an inner cavity for accommodating the bypass module, and the bottom wall is provided with a support structure for carrying the bypass module, wherein: The bottom wall is provided with two or more glue overflow grooves, and the glue overflow grooves are at least located between the side wall of the box body and the supporting structure and pass through the bottom wall.

2. The junction box according to claim 1, wherein: The glue overflow groove includes a first groove section and a second groove section, the first groove section is located on the bottom wall; the second groove section is located in the connecting area between the side wall and the bottom wall, and is communicated with the first groove section.

3. The junction box according to claim 2, characterized in that: The second trough section has an opening on the side wall facing the inner cavity, and a trough side wall and a trough bottom located inside the side wall.

4. The junction box according to claim 3, characterized in that: Along a direction perpendicular to the bottom wall of the box body, a groove side wall of the second groove section away from the bottom wall is higher than the upper surface of the bottom wall.

5. The junction box according to any one of claims 1 to 4, characterized in that: The glue overflow grooves are arranged on one side or two opposite sides of the support structure, and the glue overflow grooves on the same side are arranged at intervals.

6. The junction box according to any one of claims 1 to 4, characterized in that: The support structure is provided with a glue guiding structure, which includes a glue guiding groove, which is connected to the inner cavity and includes two connected tapered grooves, which extend toward the inner cavity and gradually shrink along the extension direction.

7. The junction box according to claim 6, characterized in that: The glue guide structure also includes a first glue guide hole and a second glue guide hole, both of which are connected to the inner cavity and are respectively located on opposite sides of the glue guide groove; one of the first glue guide hole and the second glue guide hole includes a first hole position and a second hole position, the first hole position and the second hole position are separated by a connecting portion, and both are connected to the inner cavity.

8. The junction box according to claim 6, characterized in that: In the glue guiding groove, a connecting section exists between the two sections of the tapered grooves, and a third glue guiding hole communicating with the inner cavity is provided on the connecting section.

9. A three-part junction box photovoltaic module, characterized in that: It includes a negative terminal box, an intermediate terminal box and a positive terminal box. The negative terminal box and / or the intermediate terminal box and / or the positive terminal box adopt the terminal box structure according to any one of claims 1 to 8. A bypass module is fixed in each of the negative terminal box, the intermediate terminal box and the positive terminal box.

10. The three-part junction box photovoltaic module according to claim 9, characterized in that: The bypass module includes a plastic package, a positive conductive member, and a negative conductive member, wherein: the positive conductive member and the negative conductive member both have a busbar through-hole and a fixing hole corresponding to the fixing structure; one end of the positive conductive member and one end of the negative conductive member are plastic-sealed in the plastic package, and the busbar through-holes of the positive conductive member and the negative conductive member are respectively located on opposite sides of the plastic package.

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