Solar cell module without welding strips and preparation method thereof

Abstract

The invention discloses a solar cell module and a preparation method thereof. The solar cell module is composed of five layers of structures. A first layer of conducting backing plate, a second layer of conducting resin connecting points, a third layer of back contact battery piece, a fourth layer of packaging materials and a fifth layer of tempered glass are sequentially stacked together; the first layer of conducting backing plate is of a novel stacked structure. With the design, the solar cell module without welding strips and the preparation method thereof are low in cost and easy to realize.

Description

technical field [0001] The invention relates to a solar battery assembly without welding strips and a preparation method thereof. Background technique [0002] In the existing solar cell modules, when multiple crystalline silicon solar cells are packaged in series to form a large module, tin-coated copper ribbons are generally used to weld the positive and negative busbars of adjacent cells to realize multiple solar cells. connection between. This conventional welding strip series connection method is more intuitive and simple, so it has been widely used, but this method has several major shortcomings: 1. The tin-coated layer of the tin-coated copper strip is generally SnPb alloy, The content of Pb is generally about 40%, and the large amount of Pb use has a very large potential risk to the environment; 2. The welding temperature of tin-coated copper ribbon is generally above 300 degrees during use, and thermal stress can easily cause crystalline silicon The bending and de...

AI Technical Summary

Problems solved by technology

This conventional welding strip series connection method is more intuitive and simple, so it has been widely used, but this method has several major shortcomings: 1. The tin-coated layer of the tin-coated copper strip is generally SnPb alloy, The content of Pb is generally about 40%, and the large amount of Pb use has a very large potential risk to the environment; 2. The welding temperature of tin-coated copper ribbon is generally above 300 degrees during use, and thermal stress can easily cause crystalline silicon The bending and debris of the battery sheet, especially now with the advancement of battery technology, the use of silicon wafers is getting thinner and thinner. When the thickness of the silicon wafer is less than 160um, the existing high-temperature welding technology is completely inapplicable; 3. Due to the The shading of the battery itself causes a large power packaging loss in the process of packaging the battery into a module. The packaging loss of polycrystalline cells is generally greater than 3%, and the packaging loss of monocrystalline cells is greater than 5%.

Therefore, it is extremely important to develop a new battery component structure without solder strips and its preparation method. Back contact battery components have emerged under this background. Research institutions such as the Dutch National Energy Research Center (ECN) have proposed a new battery based on conductive foil circuits. However, the structure and manufacturing process of this back-contact cell assembly are obviously more complicated, the materials used are also more expensive, and the production efficiency is low.

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