Aluminum alloy is the main material of pole ear plate and bus bar of power cells for new energy electric vehicles. In this paper, quasi-continuous wave (QCW) pulsed laser and single-mode continuous wave (CW) laser were used to conduct laser lap welding experiments on a 0.5 mm thick 1060 aluminum alloy and 2 mm thick 6061 aluminum alloy. The effects of these two laser sources on weld zone morphology and tensile force were compared. The experimental results show that the QCW pulsed laser welding is more likely to have porosity cracks and other defects, while the overall weld performance of the single-mode CW laser welding is obviously better than the former. In addition, the maximum tensile strength of the weld joint in QCW welding is about 861.02 N, while it can reach 1521.36 N in CW welding. The tensile force with CW laser welding is much higher than that required by the power battery industry standard, i.e., the tensile force of 800 N.

中文翻译：

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QCW脉冲激光与单模CW激光在功率电池接线片焊接上的比较

铝合金是新能源电动汽车动力电池极耳板和母线的主要材料。本文采用准连续波（QCW）脉冲激光器和单模连续波（CW）激光器对0.5 mm厚的1060铝合金和2 mm厚的6061铝合金进行激光搭接焊接实验。比较了这两种激光源对焊缝区形态和拉力的影响。实验结果表明，QCW脉冲激光焊接更容易出现气孔裂纹等缺陷，而单模CW激光焊接的整体焊接性能明显优于前者。此外，QCW焊接接头的最大抗拉强度约为861.02 N，而CW焊接可达到1521.36 N。