High-reliability photovoltaic module capable of preventing cold joint and fire

Abstract

The utility model provides a high-reliability photovoltaic assembly capable of preventing cold joint fire, which comprises a bus bar, the bus bar is formed by flattening a copper strip with the thickness of 0.2 mm to 0.35 mm and the width of 2 mm to 6 mm, the bus bar is provided with a hole with the length of 5 mm to 20 mm and the width of 0.2 mm to 2 mm, the copper strip is subjected to tin plating treatment, the hole is filled with tin, and a uniform coating is formed on the surface of the copper strip; according to the assembly welded by adopting the bus bar, the ratio of false soldering and pseudo soldering of bus bar welding of the welding strip is reduced from 2% to 0.01%; the ratio of pseudo soldering and false soldering of welding of the bus bar and the junction box is reduced from 1% to 0.01%. And no component burnout and power station fire caused by pseudo soldering of the two parts are found on the power station.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic component with high reliability and fire prevention against cold welding. Background Art

[0002] The busbar structure in existing photovoltaic modules consists of a central copper substrate surrounded by a tin layer. This is primarily used for soldering connections between the cell ribbons and the junction box. However, photovoltaic power plants have reported numerous module burnouts and fires due to false soldering between the ribbons and the busbars, and between the junction box and the busbars. Therefore, a highly reliable photovoltaic module with fire-resistant false soldering is being proposed. Utility Model Content

[0003] In order to solve at least one of the above-mentioned technical shortcomings, the utility model provides a highly reliable photovoltaic module that can prevent cold solder joints from catching fire, including a busbar, which is made of a copper strip with a thickness of 0.2mm to 0.35mm and a width of 2mm to 6mm. The busbar is provided with holes with a length of 5mm to 20mm and a width of 0.2mm to 2mm. The copper strip is tin-coated, the holes are filled with tin, and a uniform coating is formed on the surface of the copper strip.

[0004] Furthermore, the busbar has three rows of holes in the longitudinal direction, each hole is 10 mm long and 0.5 mm wide; the center spacing of the holes is 17.3 mm. Beneficial effects

[0005] For components welded using this busbar, the rate of false welds and cold joints in busbar welding with the solder ribbon has been reduced from 2% to 0.01%, and the rate of false welds and cold joints in welding between busbar 1 and the junction box has been reduced from 1% to 0.01%. No component burns or power plant fires have been reported in the power plant due to these two types of cold joints.

[0006] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0008] Figure 2 This is a schematic diagram of the overall surface of the present invention after tin coating treatment.

[0009] exist Figures 1 to 2 The correspondence between the component names or lines and the drawing numbers is: busbar 1, hole 2. DETAILED DESCRIPTION

[0010] Please refer to Figures 1 to 2 ;

[0011] This embodiment provides a photovoltaic module with high reliability and fire prevention of cold solder joints, including a bus bar 1, which is made of a copper strip with a thickness of 0.2 mm to 0.35 mm and a width of 2 mm to 6 mm, and a hole 2 with a length of 5 mm to 20 mm and a width of 0.2 mm to 2 mm is opened on the bus bar 1. Figure 1 , the copper strip is tinned, the tin fills the hole 2, and forms a uniform coating on the surface of the copper strip, refer to Figure 2 ;

[0012] In specific implementations, the busbar 1 was used for welding components. The percentage of false welds and cold welds in busbar 1 welding with welding strips was reduced from 2% to 0.01%, and the percentage of false welds and cold welds in welding busbar 1 to junction boxes was reduced from 1% to 0.01%. Furthermore, no component burnout or power station fires were found in power plants due to these two types of cold welds.

[0013] By setting the size of hole 2 to control the amount of tin, the proportion of false soldering and cold soldering can be greatly reduced through practice.

[0014] For further reference, Figure 1 The busbar 1 has three rows of holes 2 in the longitudinal direction, each hole 2 is 10 mm long and 0.5 mm wide; the hole center spacing is 17.3 mm;

[0015] During the specific implementation, when the busbar 1 is welded to the welding strip, the welding strip needs to be placed under the busbar 1. The tin layer is melted by electric heating above the busbar 1, and the tin in the hole 2 naturally flows to the bottom and connects with the welding strip to be welded.

[0016] In a specific implementation, during the process of welding the busbar 1 to the junction box, similarly, the tin will flow through the hole 2 to the part of the junction box to be welded, and reliable welding will be achieved during the process of pressurizing and cooling the soldering iron.

Claims

1. A photovoltaic module with high reliability and fire prevention due to cold welding, comprising a bus bar (1), characterized in that: The busbar (1) is made of a copper strip with a thickness of 0.2 mm to 0.35 mm and a width of 2 mm to 6 mm, and a hole (2) with a length of 5 mm to 20 mm and a width of 0.2 mm to 2 mm is opened on the busbar (1). The copper strip is tin-coated, and the hole (2) is filled with tin, and a uniform coating is formed on the surface of the copper strip.

2. A highly reliable photovoltaic module with fire prevention due to cold solder joints according to claim 1, characterized in that: The busbar (1) has three rows of holes (2) in the longitudinal direction, each hole (2) has a length of 10 mm and a width of 0.5 mm; and the center spacing of the holes is 17.3 mm.

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