Bus bar for solar module, its preparation method and solar module

Abstract

The invention discloses a bus bar for a solar module, its preparation method and a solar module. The bus bar includes a copper base material, a first metal coating layer coated on the surface of the copper base material, and a metal coating layer coated on the surface of the first metal coating layer. The second metal coating, the first metal coating is a metal coating including copper and nickel or an alloy coating formed by two metals, the second metal coating is a matte tin coating, and the surface of the bus bar is a matte tin coating, which is relatively At present, the bright tin coating used in the bus bar structure has good high temperature resistance, is not easy to melt tin, and is not easy to generate tin whiskers. During the welding process with the electrode, no copper leakage holes will be formed due to the remelting of the tin layer. At the same time, in this A base coating of copper, nickel or copper-nickel alloy is placed between the copper substrate of the bus bar and the matte tin coating, which can effectively prevent the copper substrate from being corroded by water vapor, and can effectively protect the copper even if there are holes in the matte tin layer. Substrate.

Description

technical field [0001] The invention relates to the technical field of solar energy, in particular to a bus bar for a solar module, a preparation method thereof and a solar module. Background technique [0002] In the technical field of solar energy, multiple welding rods are welded to each cell in the solar module, and the welding rods are welded to the bus bar in the middle of each module to form several welding spots. Current bus bars 100' are mostly as figure 1 The shown structure is obtained by coating a certain thickness of a bright tin layer (20') on a copper substrate (10'). [0003] With the development of the industry, multi-busbar (MBB) components have gradually become the mainstream products in the industry. The current product types mainly include six-busbar components, seven-busbar components, nine-busbar components, twelve-busbar components, etc. . Such as figure 2 Shown is the mainstream nine-busbar half-cut module product (2') in the industry, which inc...

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Problems solved by technology

[0004] However, as the number of solder joints on the bus bar increases, the distance between the solder joints decreases. During the welding process, the heat between the two solder joints cannot be transferred out, resulting in the remelting of the tin layer, resulting in the formation of very serious solder scars on the bus bar.

This not only affects the appearance of the component, but also forms copper leakage holes after the tin layer is remelted, thus affecting the reliability of the component

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