Interconnection material and series welding process of battery strings

Abstract

The invention discloses an interconnection material and a series welding process of a battery string, the interconnection material comprises a welding wire, the radial size of the welding wire is 0.05-0.35 mm, the welding wire is formed by twisting a plurality of microwires, and the surface of each microwire is provided with a metal coating with a low melting point. The invention provides an interconnection material and a series welding process of a battery string, aiming at solving the technical problem that the existing interconnection material has more defects in an interconnection process, which can overcome the technical problem and ensure the quality of the finally obtained battery string.

Description

technical field [0001] The invention relates to the technical field of photovoltaic equipment, in particular to an interconnection material and a string welding process of battery strings. Background technique [0002] The stringing process is determined by the design of interconnection materials and cell structures. There are three main interconnection processes at present: [0003] Rectangular Ribbon Interconnection: By using a conventional stringer, two, three, four, five, or six bus electrodes can be connected in series. The main thing is to put an interconnection strip on the bus electrodes on the upper and lower sides of the battery at the same time, and then Soldering tin and bus electrodes by high temperature is the most conventional process. There are two variants of this process, one is to make a zigzag or a single triangular peak on the interconnection strip on the light-receiving surface, and the other is flat, mainly to increase the reflection of the welding st...

AI Technical Summary

Problems solved by technology

The biggest advantage of this process is that because the flat welding ribbon is used on the back, it is not necessary to use thickened adhesive material on the back, but the thickened adhesive material is still used on the front, especially if the triangular welding ribbon is used on the front, it is more expensive than It is thicker when using round welding strips; on the other hand, due to the existence of overlapping points, the reliability risk of poor welding and long-term operation is increased, and the overlapping length of flat welding strips and round welding strips must be long enough, Since the width of the flat ribbon is greater than the diameter of the round ribbon, this leads to an increase in the shading area, and it does not look so beautiful; in addition, in the case of increasing battery size, the battery will be damaged when the components are packaged and connected in series. More slitting of the sheet becomes an inevitable trend. Under this trend, another problem of lap welding is exposed. The increased number of slitting also increases the number of lap joints, thereby increasing the shading area of ​​the flat welding strip. , the risk of more increased lap points

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