Busbar-free double-sided battery module and its manufacturing process

Abstract

Provided is a main-grid-free double-side battery pack including right-side tempered coated glass, a right-side EVA film, a main-grid-free double-side battery array, a back-side EVA film and back-side tempered coated glass that are sequentially laminated, the main-grid-free double-side battery array includes a plurality of main-grid-free double-side cells and a plurality of copper-tin metal wire films, each copper-tin wire film connects two cells to form a cell string, and then a plurality of cell strings are serially connected side by side to form the main-grid-free double-side battery array. The copper-tin metal wires replace the cell main grids and copper-tin solder strips to collect current, so that the use of silver paste is saved, and the invisible cracking and splinters caused by high temperature welding can be reduced. Since the copper-tin metal wires are several times greater than the number of the main grid lines, the current at each position of the cell can be uniformly collected, so that the cell short circuit current is improved, and the cell and pack transition efficiency is improved.

Description

technical field [0001] The invention relates to a solar cell, in particular to a busbar-free double-sided cell assembly and a manufacturing process thereof. Background technique [0002] Bifacial cells can receive light on both sides. In addition to outputting power on the front side, the back side can also convert reflected or irradiated solar energy into electrical energy. Compared with traditional monocrystalline and polycrystalline cells, the conversion efficiency is greatly improved, and the front side can achieve 19.8% power generation efficiency, 19.2% power generation efficiency can be achieved on the back. At the same time, the use of double-sided cells can change the traditional way of installing components, and vertical installation can achieve higher efficiency output than inclined installation. However, due to the complex preparation process of double-sided batteries, the cells are relatively weak after multiple processes, so cracks are prone to occur when conv...

AI Technical Summary

Problems solved by technology

However, due to the complex preparation process of double-sided batteries, the cells are relatively weak after multiple processes, so cracks are prone to occur when conventional high-temperature welding methods are used; in addition, due to the large short-circuit current of double-sided cells, conventional packaging processes are used to package The power loss of the rear battery is also relatively large. The above reasons have caused the slow development of the application of double-sided batteries. Therefore, it is particularly important to find ways to reduce the cracks of the battery and the power loss of the package.

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