A miniaturized high-strength, low-glue, high-heat-resistant junction box

Abstract

The present invention discloses a miniaturized high-strength, low-glue-filled, high-heat-resistant junction box, wherein the cover plate is connected to the base through a mechanical buckle structure, the buckle hook is arranged on the lower surface of the cover plate, the buckle seat is arranged in a square through hole connected to the inner side of the outer wall of the base, the side of the cover plate corresponding to the buckle hook is provided with a prying insertion groove, the outer surface of the cover plate is provided with a plurality of parallelly arranged reinforcing ribs, the outer wall and the bottom of the base have interconnected holes, the terminal board is composed of a plurality of boards, a diode is installed on the terminal board, two cables are inserted from the base and connected to both sides of the terminal board, the arrangement direction of the diode on the terminal board is parallel to the direction of the cables, and the two outermost diodes are close to the surfaces of the cables on the left and right sides respectively. The present invention realizes the miniaturization of the photovoltaic junction box, high heat resistance, low glue filling, and high structural strength.

Description

Technical Field

[0001] The invention relates to the field of photovoltaic junction box structure design, and in particular to a junction box structure with small volume, high mechanical strength, small glue filling amount and high heat resistance. Background Art

[0002] The photovoltaic junction box is an important component used to connect the photovoltaic module panels and inverters in the solar power generation system. At present, the specifications of the photovoltaic junction box are developing in the direction of miniaturization, and the requirements for internal heat dissipation are getting higher and higher. The diodes on the terminal board are important heating components. The diodes are located very close to each other in the narrow space inside the photovoltaic junction box, and the heat is relatively concentrated and cannot be dissipated, which makes the heat dissipation pressure inside the junction box increasingly greater. Under the premise of not increasing the size of the junction box, optimizing the heat dissipation performance of the photovoltaic junction box is the main goal of the current photovoltaic junction box design. On this basis, reducing the amount of glue in the photovoltaic junction box to reduce costs and improve the mechanical structure strength of the box body are also goals that need to be achieved in the current photovoltaic junction box design. Summary of the invention

[0003] In view of the above problems, the applicant has conducted research and improvements and now provides a miniaturized, high-strength, low-glue, and high-heat-resistant junction box, which aims to achieve miniaturization, high heat resistance, low glue injection, and high structural strength of the photovoltaic junction box.

[0004] The technical solution of the present invention is as follows:

[0005] A miniaturized high-strength, low-glue, and high-heat-resistant junction box comprises a matching cover plate, a base, and a terminal board installed in the internal space of the two, wherein a plurality of diodes are installed on the terminal board, and two cables are respectively connected to the left and right sides of the terminal board after passing through the base from the outside, and are respectively fixed to the base by wire buckles, and is characterized in that the arrangement direction of the plurality of diodes on the terminal board is parallel to the direction of the cables, and the two outermost diodes are respectively close to the surfaces of the cables on the left and right sides.

[0006] Furthermore, the terminal board is composed of multiple boards.

[0007] Furthermore, if the number of the diodes is two, the terminal board includes two small short plates and one "T"-shaped plate; the upper pin of the left diode and the end of the left cable, and the upper pin of the right diode and the end of the right cable are connected respectively through small short plates, and the lower pin of the left diode and the lower pin of the right diode are connected through a "T"-shaped plate; the small short plate is perpendicular to the cable.

[0008] Furthermore, the number of the diodes is more than 3, and the diodes are numbered from 1 to n in order from left to right, where n is greater than or equal to 3, and the terminal board includes 2 small short boards, n-2 "Z"-shaped boards and 1 "T"-shaped board; the upper pin of diode No. 1 and the end of the left cable, and the upper pin of diode No. n and the end of the right cable are connected via small short boards, respectively, the lower pin of diode No. 1 and the upper pin of diode No. 2, ... the lower pin of diode No. n-2 and the upper pin of diode No. n-1 are connected via "Z"-shaped boards, and the lower pin of diode No. n-1 and the lower pin of diode No. n are connected via "T"-shaped boards; the small short boards are perpendicular to the cables.

[0009] Furthermore, the cover plate is provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs are arranged in parallel on the outer surface of the cover plate.

[0010] Furthermore, the outer wall and the bottom of the base are provided with holes, and the holes on the outer wall of the base are connected with the holes on the bottom of the base.

[0011] Furthermore, the middle of the bottom surface of the base is a mounting surface, the terminal board and the diode are mounted on the mounting surface of the base, and the horizontal position of the mounting surface of the base is higher than the horizontal position of the bottom surface of the base.

[0012] Furthermore, a mounting plate is provided above the bottom surface of the base, the terminal board and the diode are mounted on the mounting plate, and the horizontal position of the mounting plate is higher than the horizontal position of the bottom surface of the base.

[0013] Furthermore, the cover plate and the base are connected via a mechanical buckle structure, which includes a buckle hook and a buckle seat. The buckle hook is arranged on the lower surface of the cover plate, and the buckle seat is arranged in a square through hole connected to the inner side of the outer wall of the base.

[0014] Furthermore, a prying insertion groove is provided on the side of the cover plate at a position corresponding to the buckle hook.

[0015] The beneficial technical effects of the present invention are:

[0016] 1. The diodes in the present invention are arranged in a vertical row. The diodes in the vertical row are more compact with each other, occupying less space, and can reduce the volume of the junction box. At the same time, the vertical arrangement lengthens the distance between the welding points of the diodes, distributes the heat source points, and is beneficial to the heat dissipation of the junction box.

[0017] 2. The cable of the present invention also has a good heat conduction effect. Since the diode is very close to the cable, not only the distance from the diode pin to the cable is shorter, but also the cable surface is very close to the diode. The heat on the diode surface can be easily transferred to the cable through the potting glue and dissipated to the outside.

[0018] 3. The external reinforcement ribs of the cover plate of the present invention are helpful to prevent deformation of the junction box. On the one hand, the external reinforcement ribs can prevent deformation of the cover plate when subjected to external impact. On the other hand, it prevents traditional internal reinforcement ribs from internal thermal deformation, thereby improving the strength of the junction box.

[0019] 4. The outer wall and bottom of the junction box of the present invention are suspended, which is beneficial to heat dissipation. This is because the heat resistance of the back plate of the solar panel is poor. The suspended design prevents the hottest part of the junction box from contacting the back plate of the solar panel. The two are isolated by convection air, thereby improving the life of the back plate of the solar panel.

[0020] 5. The buckle structure on the base of the present invention not only serves as a mechanical buckle, but also increases the heat dissipation surface and reduces the amount of glue filling, thereby reducing the user's usage cost. When the cover needs to be opened, the screwdriver or other tools are inserted from the side instead of the traditional insertion from the top, thereby changing the force direction, effectively preventing the box body and the glue filling from being separated by force, and improving the strength of the junction box.

[0021] Advantages of the present invention will be given in the description of the following specific embodiments, and part will be obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an exploded view of an embodiment of the present invention.

[0023] Figure 2 It is a three-dimensional diagram of the cover.

[0024] Figure 3 This is the front view of the cover.

[0025] Figure 4 is the rear view of the cover.

[0026] Figure 5 yes Figure 3 AA section view of the cover.

[0027] Figure 6 It is a three-dimensional image of the base.

[0028] Figure 7 This is the front view of the base.

[0029] Figure 8 This is the rear view of the base.

[0030] Fig. 9 It is an assembly drawing of the present invention.

[0031] Fig.10 It is one of the assembly drawings of the present invention except the cover plate.

[0032] Fig.11 It is an exploded view of another embodiment of the present invention.

[0033] Fig.12 It is the second assembly drawing of the present invention except the cover plate.

[0034] Fig.13 This is the main view of terminal board scheme 1.

[0035] Fig.14 This is the rear view of terminal board solution 1.

[0036] Fig.15 This is a top view of terminal board solution one.

[0037] Fig.16 This is a bottom view of terminal board plan 1.

[0038] Fig.17 yes Fig.13 AA section view of the terminal board.

[0039] Fig.18 This is the main view of terminal board solution 2. DETAILED DESCRIPTION

[0040] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0041] Figure 1 The figure shows the exploded structure of an embodiment of the present invention, which includes a base 1, a mounting plate 2, a diode 3, a terminal board 4, a cable 5, a wire buckle 6 and a cover plate 7. The base 1 cooperates with the cover plate 7, the mounting plate 2 is placed in the internal space of the two, the terminal board 4 is installed above the mounting plate 2, three diodes 3 are installed on the terminal board 4, and two cables 5 are inserted from the outside of the base 1 into the inside of the base 1 and are electrically connected (including welding or riveting) on ​​the left and right sides of the terminal board 4, and are fixed to the base 1 by wire buckles 6 respectively.

[0042] Figure 2 to Figure 5 The structure of the cover is shown. Three reinforcing ribs 8 are arranged on the cover 7 in parallel on the outer surface of the cover 7, and the distance between adjacent reinforcing ribs 8 should not be too long. This structure changes the traditional structure of setting the reinforcing ribs inside the cover 7. The traditional reinforcing ribs set inside the cover 7 are easily deformed by internal heat, while the external reinforcing ribs 8 of the present invention can prevent internal thermal deformation. At the same time, the external reinforcing ribs 8 can prevent the deformation of the cover 7 when it is impacted by the outside, thereby improving the strength of the junction box.

[0043] like Figure 2 , Figure 4 , Figure 5As shown, the lower surface of the cover plate 7 is provided with four hooks 9, which are used to cooperate with the buckle seats provided on the base 1 to form a mechanical buckle structure, and the cover plate 7 and the base 1 are connected together through the mechanical buckle structure. The side of the cover plate 7 is provided with a prying insertion groove 10 at a position corresponding to the hook. The traditional design is to set the prying insertion groove on the upper surface of the cover plate. When the cover plate needs to be opened, a screwdriver or other tool is inserted from above and pried against the base 1. The base 1 and the glue potting are easily separated by force. The present invention changes the force direction and inserts a screwdriver or other tool from the prying insertion groove 10 on the side, which effectively prevents the box body and the glue potting from being separated by force, thereby improving the strength of the junction box.

[0044] Figure 6 to Figure 8 The structure of the base is shown. The inner side of the outer wall of the base 1 has four square through holes 11, and buckle seats 12 are arranged in these square through holes 11. The buckle seats 12 correspond to the buckle hooks 9 on the cover plate 7 mentioned above. The structure of the buckle seats 12 arranged in the square through holes 11, on the one hand, plays the function of mechanical buckle, and on the other hand, the surface area of ​​the square through holes 11 is large, which plays the role of increasing the heat dissipation surface. In addition, the space surrounded by the square through holes 11 does not need to be filled with glue, which can reduce the amount of glue filling and reduce the user's use cost.

[0045] Fig. 9 The structure of the present invention after assembly is shown, which clearly shows the position of the prying insertion slot 10.

[0046] Fig.10 The structure of the present invention after the rest of the components are assembled except for the cover plate is shown. The outer wall and the bottom of the base 1 are provided with holes 13, and the terminal board 4 and the diode 3 are mounted on the mounting plate 2. The horizontal position of the mounting plate 2 is higher than the horizontal position of the bottom surface of the base 1, so that the hole 13 on the outer wall of the base 1 and the hole 13 at the bottom of the base 1 are connected. This suspended design is conducive to heat dissipation, so that the hottest part of the junction box, that is, the bottom of the mounting plate 2, does not directly contact the back plate of the solar panel with poor heat resistance, and the two are isolated by convection air, which improves the life of the back plate of the solar panel.

[0047] In another embodiment, the mounting plate may be omitted. Fig.11 As shown, the middle of the bottom surface of the base 1 is the mounting surface, and the mounting surface is consistent with the shape of the omitted mounting plate. The terminal board 4 and the diode 3 are directly mounted on the mounting surface of the base 1. As long as the horizontal position of the mounting surface of the base 1 is higher than the horizontal position of the bottom surface of the base 1, the same suspension effect can be achieved.

[0048] The diode 3 is mounted on the terminal board 4 as follows Fig.12As shown, the arrangement direction of the diodes 3 on the terminal board 4 is parallel to the direction of the cable 5, and the two outermost diodes 3 are close to the surfaces of the left and right cables 5 respectively. This arrangement makes the diodes 3 more compact with each other, occupies less space, and can reduce the volume of the junction box. At the same time, it lengthens the distance between the welding points of the diodes 3, distributes the heat source points, and is beneficial to the heat dissipation of the junction box. Since the diodes 3 are very close to the cable 5, not only is the distance from the pins of the diodes 3 from the terminal board 4 to the cable 5 shorter, but also the surface of the cable 5 is very close to the diodes 3, and the heat on the surface of the diodes 3 can be easily transferred to the cable 5 through the potting glue, and dissipated to the outside through the cable 5.

[0049] In order to realize the arrangement of the diodes 3 described above, the structure of the corresponding terminal board 4 is designed as follows.

[0050] There are several situations:

[0051] like Figure 13 to Figure 17 As shown, in this embodiment, the number of diodes 3 is 3, and the diodes 3 are numbered from left to right as diodes 1 to 3, then the terminal board 4 includes 2 small short plates 14, 1 "Z"-shaped plate 15 and 1 "T"-shaped plate 16; the upper pin of diode No. 1 3 and the end of the left cable 5, and the upper pin of diode No. 3 3 and the end of the right cable 5 are connected respectively through the small short plates 14, the lower pin of diode No. 1 3 and the upper pin of diode No. 2 3 are connected through the "Z"-shaped plate 15, and the lower pin of diode No. 2 3 and the lower pin of diode No. 3 are connected through the "T"-shaped plate 16; the small short plate 14 is perpendicular to the cable 5.

[0052] By analogy, when the number of diodes 3 is greater, the diodes 3 are numbered from 1 to n from left to right, and n is greater than or equal to 3. The terminal board 4 includes 2 small short boards, n-2 "Z"-shaped boards and 1 "T"-shaped board; the upper pin of diode No. 1 and the end of the left cable, the upper pin of diode No. n and the end of the right cable are connected through small short boards, the lower pin of diode No. 1 and the upper pin of diode No. 2, ... the lower pin of diode No. n-2 and the upper pin of diode No. n-1 are connected through "Z"-shaped boards, and the lower pin of diode No. n-1 and the lower pin of diode No. n are connected through "T"-shaped boards; the small short board is perpendicular to cable 5.

[0053] like Fig.18As shown, in this embodiment, the number of diodes 3 is only two, and the terminal board 4 includes two small short plates 14 and one "T"-shaped plate 16, without a "Z"-shaped plate. The connection method is changed to: the upper pin of the left diode 3 and the end of the left cable 5, the upper pin of the right diode 3 and the end of the right cable 5 are connected respectively through the small short plates 14, and the lower pin of the left diode 3 and the lower pin of the right diode 3 are connected through the "T"-shaped plate 16; similarly, the small short plate 14 is perpendicular to the cable 5.

[0054] The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A miniaturized high-strength, low-glue, high-heat-resistant junction box, comprising a matching cover plate, a base, and a terminal board installed in the internal space of the two, wherein a plurality of diodes are installed on the terminal board, and two cables are respectively connected to the left and right sides of the terminal board after passing through the base from the outside of the base, and are respectively fixed to the base by wire buckles, Features: The diode is an axial lead package, the arrangement direction of the multiple diodes on the terminal board is parallel to the direction of the cable, and the outermost two diodes are close to the surfaces of the left and right cables respectively; the terminal board is composed of multiple boards; If the number of the diodes is two, the terminal board includes two small short boards and one "T"-shaped board; the upper pin of the left diode and the end of the left cable, the upper pin of the right diode and the end of the right cable are connected by small short boards respectively, and the lower pin of the left diode and the lower pin of the right diode are connected by a "T"-shaped board; the small short board is perpendicular to the cable; Alternatively, the number of the diodes is more than 3, and the diodes are numbered from 1 to n in order from left to right, where n is greater than or equal to 3, and the terminal board includes 2 small short boards, n-2 "Z"-shaped boards and 1 "T"-shaped board; the upper pin of diode No. 1 and the end of the left cable, and the upper pin of diode No. n and the end of the right cable are connected respectively through small short boards, the lower pin of diode No. 1 and the upper pin of diode No. 2, ... the lower pin of diode No. n-2 and the upper pin of diode No. n-1 are connected respectively through "Z"-shaped boards, and the lower pin of diode No. n-1 and the lower pin of diode No. n are connected through "T"-shaped boards; the small short boards are perpendicular to the cables.

2. According to claim 1, the miniaturized high-strength, low-glue, high-heat-resistant junction box, Features: The cover plate is provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs are arranged in parallel on the outer surface of the cover plate.

3. According to claim 1, the miniaturized high-strength, low-glue, high-heat-resistant junction box, Features: The outer wall and the bottom of the base are both provided with holes, and the holes on the outer wall of the base are connected with the holes on the bottom of the base.

4. According to claim 3, the miniaturized high-strength, low-glue, high-heat-resistant junction box, Features: The middle of the bottom surface of the base is a mounting surface, the terminal board and the diode are mounted on the mounting surface of the base, and the horizontal position of the mounting surface of the base is higher than the horizontal position of the bottom surface of the base.

5. According to claim 3, the miniaturized high-strength, low-glue, high-heat-resistant junction box, Features: A mounting plate is provided above the bottom surface of the base, the terminal plate and the diode are mounted on the mounting plate, and the horizontal position of the mounting plate is higher than the horizontal position of the bottom surface of the base.

6. The miniaturized high-strength, low-glue, high-heat-resistant junction box according to claim 1, Features: The cover plate is connected to the base via a mechanical buckle structure, which includes a buckle hook and a buckle seat. The buckle hook is arranged on the lower surface of the cover plate, and the buckle seat is arranged in a square through hole connected to the inner side of the outer wall of the base.

7. The miniaturized high-strength, low-glue, high-heat-resistant junction box according to claim 6, Features: A prying insertion groove is provided on the side of the cover plate at a position corresponding to the buckle hook.

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