CN211908737U

CN211908737U - Install in terminal box that has increase creepage distance structure at backplate edge

Info

Publication number: CN211908737U
Application number: CN202020881333.0U
Authority: CN
Inventors: 彭祁军; 郑朋朋; 李艳群; 朱于静
Original assignee: Zhejiang Xinhui Photovoltaic Technology Co ltd
Current assignee: Zhejiang Zhengtai Xinhui Photovoltaic Co ltd
Priority date: 2020-05-24
Filing date: 2020-05-24
Publication date: 2020-11-10
Anticipated expiration: 2030-05-24

Abstract

The utility model discloses an install in terminal box that has increase creepage distance structure at backplate edge belongs to the structural design field of photovoltaic terminal box. The technical scheme of the utility model be at the edge of box at the bottom of the terminal box set up the box body face of bending, the box body face of bending at the bottom of the perpendicular to box bottom face is buckled downwards, the bottom surface of end box is attached in the surface of photovoltaic backplate, the box body face of bending is then attached in the edge of photovoltaic backplate. According to the technical scheme, the creepage distance from the position of the bus belt to the position capable of being touched is increased through the bent surface of the box body by utilizing the edge space of the back plate; the box body surface of bending has played limiting displacement moreover, and the position skew causes when avoiding the terminal box at the bottom of the terminal box adhesive plate and shelters from harmful effects such as battery. Through the design, the electrical safety performance of the photovoltaic module is greatly improved.

Description

Install in terminal box that has increase creepage distance structure at backplate edge

Technical Field

The utility model belongs to the structural design field of photovoltaic terminal box, concretely relates to install in terminal box at photovoltaic backplate edge, this terminal box has the structure that increases creepage distance.

Background

At present, a photovoltaic module formed by combining solar cells is widely applied to various photovoltaic power generation systems of buildings as a basic photovoltaic power generation unit. In order to improve the power generation efficiency per unit area, various photovoltaic modules of novel and efficient structures are continuously developed and applied. In practical use, the electric energy generated by the photovoltaic module needs to be led out through the junction box to be connected with an external load. Therefore, the junction box is a key component of the photovoltaic module for constructing various power generation systems.

The junction box is generally directly attached to the surface of the photovoltaic module backplane. In the process of attaching the junction box, the attaching work is always completed by manual operation. Due to the fact that quality differences such as visual errors and box body consistency exist in manual operation, the position of the junction box on the photovoltaic backboard is prone to shifting, and adverse effects such as battery shading are caused.

For the electrical safety of photovoltaic modules, there are strict limitations on the creepage distance of junction boxes in product standards. In the current photovoltaic module, the bus bar penetrates into the junction box from the back of the module and is welded with a welding area of a copper terminal in the junction box, and the shortest distance from the edge of the welding area (namely the edge of the bus bar) to the side edge of the junction box is the creepage distance of the junction box. Generally, the higher the voltage, the greater the creepage distance requirement. In order to solve the problem of creepage distance in high and large electric environments, a certain bending structure is generally arranged in the junction box, but the volume or the area of the junction box is increased by the bending structure.

Therefore, on one hand, the mounting position precision of the junction box on the photovoltaic back plate is improved, and the position deviation is avoided; on the other hand, the creepage distance of the junction box is increased as much as possible, and the safety requirement of the electrical performance of the assembly is met. The above two aspects are the targets to be achieved in the design of the current junction box.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an install in terminal box that has the increase creepage distance structure at backplate edge to the problem of offset when solving creepage distance and the end box sticky plate of the present terminal box that proposes in the above-mentioned background art.

The technical scheme of the utility model as follows:

the junction box with the structure for increasing the creepage distance, which is arranged on the edge of a back plate, comprises a junction box bottom box, wherein the edge of the junction box bottom box is connected with a bending surface.

Preferably, the bottom surface of the junction box bottom box is quadrilateral, and only one side of the junction box bottom box is connected with a bending surface.

Preferably, the two ends of the junction box bottom box are respectively provided with a wire inlet end and a wire outlet end of the photovoltaic cable, and the bending surface is connected to one side of the junction box bottom box, which is different from the wire inlet end and the wire outlet end of the photovoltaic cable.

Preferably, the bottom surface of the junction box bottom box is a plane, and the bending surface is perpendicular to the bottom surface of the junction box bottom box and bends downwards.

Preferably, the bottom surface of the junction box bottom box is attached to the surface of the photovoltaic back plate, and the bending surface is attached to the edge of the photovoltaic back plate.

Preferably, a convergence belt is installed in the junction box bottom box.

Preferably, the bonding positions of the diodes on the terminals are distributed in a staggered manner.

Preferably, a bus bar aperture is provided in each terminal, said bus bar apertures separating the diode bonding locations on the terminals.

Due to the adoption of the technical scheme, the utility model discloses a beneficial technological effect is:

the utility model provides an install in terminal box that has increase creepage distance structure at backplate edge. On one hand, the creepage distance from the position of the bus belt to the position capable of being touched is increased through the bending surface of the box body by utilizing the edge space of the back plate; on the other hand, the bending surface of the box body plays a role in limiting, and adverse effects of battery shielding and the like caused by position deviation when the bottom box of the junction box is stuck with a plate are avoided; the third aspect is that the arrangement mode of the diodes on the terminals makes the terminal group more compact, occupies small space, can reduce the volume of the junction box, and simultaneously makes the distance between the pins of the diodes farther, makes the heat source points distributed, and is beneficial to the heat dissipation of the junction box. Through the design, the electrical safety performance of the photovoltaic module is greatly improved.

Advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is an overall appearance diagram of the present invention.

Fig. 2 is an overall exploded view of the present invention.

Fig. 3 is a perspective view of the junction box bottom case.

Fig. 4 is a front view of the junction box bottom box.

Fig. 5 is a left side view of the terminal block bottom box.

Fig. 6 is an installation view of the junction box bottom box and the photovoltaic back plate.

The various labels in the figure define: 1 lid, 2 terminals, 3 diodes, 4 end boxes, 5 buckles, 6 box body faces of bending, 7 converge and take, 8 photovoltaic backplate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Fig. 1 shows the overall appearance of the junction box, and fig. 2 shows the structure of the junction box in an exploded view. Referring to fig. 1 and 2, the junction box of the present invention comprises a box body formed by buckling a box cover 1 and a bottom box 4. A plurality of terminals 2 and a plurality of diodes 3 are arranged in the box body. The diodes 3 are soldered between the terminals 2, and electrically connect the terminals 2. The terminals 2 are then fixed to the positioning posts in the bottom case 4 through the mounting holes. The left end and the right end of the box body are respectively provided with a pressing buckle 5, the pressing buckle 5 is used for welding the photovoltaic cable with the terminal 2 in the box body after the photovoltaic cable passes through the pressing buckle 5, and the pressing buckle 5 is ultrasonically welded with the bottom box 4.

Referring to fig. 2, each terminal 2 is provided with an elongated bus bar via which separates the soldering positions of the diodes 3 on the terminals 2. Further, the diodes 3 are not soldered to the same side of the terminal 2, but are soldered to the terminal 2 at different positions. If all diodes 3 are divided into two groups one by one, the diodes 3 of the odd group and the diodes 3 of the even group are respectively positioned at two sides of the terminal 2. The purpose of doing so is on the one hand to realize compact arrangement, make the combination of diode 3 and terminal 2 more compact, the space that occupies is little, can reduce the volume of terminal box, and on the other hand is for the heat dissipation, and the distance between the pin of diode 3 is farther, and the heat dispersion makes the heat source point distribute, is favorable to the heat dissipation of terminal box.

Fig. 3, 4 and 5 show the structure of the bottom box of the present junction box by various angle views. Referring to fig. 3, 4 and 5, the bottom surface of the bottom box 4 is quadrilateral, the left side and the right side of the bottom box 4 are respectively provided with a wire inlet end and a wire outlet end of the photovoltaic cable, and one side of the bottom box 4, which is different from the wire inlet end and the wire outlet end of the photovoltaic cable, is connected with a box body bending surface 6. And only one side of the bottom box 4 is connected with the box body bending surface 6, and the other side opposite to the bottom box 4 is not required to be provided with the box body bending surface 6. The box body bending surface 6 is connected with the edge of the bottom box 4. The bottom surface of the bottom box 4 is a plane, and the box body bending surface 6 is perpendicular to the bottom surface of the bottom box 4 and is bent downwards.

Fig. 6 shows an installation diagram of the bottom box and the photovoltaic back plate of the junction box. Referring to fig. 6, the bottom surface of the bottom case 4 is attached to the surface of the photovoltaic back panel 8, and the bending surface 6 of the case body is attached to the edge of the photovoltaic back panel 8. The bottom box 4 is internally provided with a bus bar 7, the bus bar 7 penetrates into the junction box from the back and is welded with the terminal 2 in the junction box, and the shortest distance from the edge of the bus bar 7 to the side edge of the junction box is the creepage distance of the junction box. This terminal box has utilized backplate marginal space, has increased the creepage distance of converging 7 positions of taking to can touch the position through box body face 6 of bending. The box body bending surface 6 also plays a limiting role, and adverse effects such as shading batteries and the like caused by position deviation when the bottom box 4 is adhered to the photovoltaic backboard 8 are avoided.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a install in terminal box that has increase creepage distance structure of backplate edge, includes the terminal box bottom box, its characterized in that: the edge of the junction box bottom box is connected with a bending surface.

2. The junction box with the structure for increasing the creepage distance mounted on the edge of the back plate of claim 1, wherein: the bottom surface of the junction box bottom box is quadrilateral, and only one side of the junction box bottom box is connected with a bending surface.

3. The junction box with the structure for increasing the creepage distance mounted on the edge of the back plate of claim 2, wherein: the two ends of the junction box bottom box are respectively provided with a wire inlet end and a wire outlet end of the photovoltaic cable, and the bending surface is connected to one side of the junction box bottom box, which is different from the wire inlet end and the wire outlet end of the photovoltaic cable.

4. The junction box with the structure for increasing the creepage distance mounted on the edge of the back plate of claim 1, wherein: the bottom surface of the junction box bottom box is a plane, and the bending surface is perpendicular to the bottom surface of the junction box bottom box and bends downwards.

5. The junction box with the structure for increasing the creepage distance mounted on the edge of the back plate of claim 4, wherein: the bottom surface of the junction box bottom box is attached to the surface of the photovoltaic backboard, and the bending surface is attached to the edge of the photovoltaic backboard.

6. The junction box with the structure for increasing the creepage distance mounted on the edge of the back plate of claim 1, wherein: and a convergence belt is arranged in the junction box bottom box.

7. The junction box with the structure for increasing the creepage distance mounted on the edge of the back plate of claim 1, wherein: the welding positions of the diodes on the terminals are distributed in a staggered mode.

8. The junction box with the structure for increasing the creepage distance mounted on the edge of the back plate of claim 1, wherein: each terminal is provided with a bus bar through hole which separates the welding positions of the diodes on the terminals.