Photovoltaic junction box

Abstract

The utility model discloses a photovoltaic junction box, including the casing, be equipped with N piece conducting sheet and N-1 diode in the casing, every diode links to each other adjacent conducting sheet, and N is the integer of 2-5, there is a welding area on every conducting sheet for welding bus bar, the welding area of partial conducting sheet is insulating closed area, the meaning of insulating closed area is in the plane of conducting sheet, and the closed geometry is formed by insulating material, and the welding area is enclosed in it. The utility model seals a part of welding area with insulating material, so when welding bus bar, even if it is temporarily separated from the control of the worker, also can not be shorted to other conducting sheet, thereby avoid the risk of short circuit.

Description

Technical Field

[0001] This utility model belongs to the field of solar cell technology, and in particular relates to a photovoltaic junction box. Background Technology

[0002] A photovoltaic junction box is an important component of solar cells, used to connect multiple solar panels and collect the current they generate. It generally consists of a housing containing several conductive plates, with adjacent conductive plates connected by diodes; the conductive plates are used to weld busbars, thereby collecting the current generated by the solar panels.

[0003] The drawback of the existing technology is that, since the busbar is a metal strip with a certain degree of elasticity, it may come into contact with other busbars or metal sheets during the process of welding it to the metal sheet, thereby causing a short circuit. Summary of the Invention

[0004] The purpose of this utility model is to overcome the defects of the prior art and provide a photovoltaic junction box.

[0005] The technical solution adopted by this utility model is as follows: a photovoltaic junction box includes a housing, inside which are provided N conductive sheets and N-1 diodes, each diode connecting adjacent conductive sheets, where N is an integer from 2 to 5; each conductive sheet has a welding area for welding busbars; the characteristic is that the welding area of ​​some conductive sheets is an insulated closed area, meaning that on the plane where the conductive sheet is located, an insulated geometric shape is formed by insulating material, enclosing the welding area within it; the number of conductive sheets with insulated closed areas is not less than N / 2.

[0006] The welding area includes an opening for the busbar to pass through in a direction perpendicular to the conductive sheet and weld to the conductive sheet.

[0007] Furthermore, the shell is elongated, N=3, and the welding area of ​​the two conductive sheets is an insulated and sealed area, distributed at both ends of the shell.

[0008] This invention encloses a portion of the welding area with insulating material, so that even if the busbar is briefly out of the worker's control during welding, it will not short-circuit to other conductive pieces, thus avoiding the risk of short circuit. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model.

[0010] Figure 2 yes Figure 1 Top view.

[0011] Figure 3 yes Figure 2 Internal schematic diagram.

[0012] The reference numerals are as follows: 01, 02, 03 - conductive sheets; 11, 12, 13 - welding areas; 21, 22 - insulating enclosing blocks; 31, 32, 33 - openings; 41, 42 - diodes. Detailed implementation manners

[0013] Referring to the attached drawings. This embodiment includes a housing (not shown in the figure). There are three conductive sheets inside the housing, which are respectively marked as 01, 02, and 03. Geometrically, the overall shape is long. Conductive sheet 01 and 02 are located at both ends of the long strip, and conductive sheet 03 is in the middle. They are arranged in an irregular zigzag pattern with conductive sheets 01 and 02 respectively, and are connected to conductive sheets 01 and 02 through diodes 41 and 42 respectively. It should be noted that in some cases, parallel diodes can be used. For example, two diodes in the same direction are used to connect conductive sheet 01 and 03. In this case, the two parallel diodes play the same role and can be regarded as one diode.

[0014] Each of the three conductive sheets has an area for welding a bus bar, which are respectively marked as 11, 12, and 13. In the direction perpendicular to the attached drawings, the bus bar passes through the opening 31 between conductive sheets 01 and 03 from bottom to top, and then is welded to the welding area 11 of conductive sheet 01; or the bus bar passes through the opening 32 between conductive sheets 02 and 03 from bottom to top, and then is welded to the welding area 12 of conductive sheet 02; or the bus bar passes through the opening 33 formed by conductive sheet 03 itself from bottom to top, and then is welded to the welding area 13 of conductive sheet 03. There are actually two places for the welding area 13. Either one can be selected, or two bus bars can be used to weld both places simultaneously.

[0015] Insulating material blocks 21 and 22 enclose the welding areas 11 and 12 therein. Figure 3 It can be seen more clearly that two dotted lines form a "hui" character shape, which is the insulating material block, forming an enclosing area, enclosing the welding area 11 together with the opening 31 in the insulating material block 21, and enclosing the welding area 12 together with the opening 32 in the insulating material block 22.

Claims

1. A photovoltaic junction box, comprising a housing, wherein N conductive plates and N-1 diodes are disposed within the housing, each diode connecting adjacent conductive plates, wherein N is an integer from 2 to 5; each conductive plate has a welding area for welding busbars; characterized in that: The welding area of ​​some conductive sheets is an insulated and enclosed area. The insulated and enclosed area means that on the plane where the conductive sheet is located, an insulating material forms a closed geometry that encloses the welding area. The number of conductive sheets with insulated and enclosed areas is not less than N / 2.

2. The photovoltaic junction box as described in claim 1, characterized in that: The welding area includes an opening for the busbar to pass through in a direction perpendicular to the conductive sheet and weld to the conductive sheet.

3. The photovoltaic junction box as described in claim 1 or 2, characterized in that: The shell is elongated, N=3, and the welding area of ​​the two conductive sheets is an insulated and sealed area, distributed at both ends of the shell.

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