摘要
锂电池极耳采用高反材料,为了提高锂电池极耳的焊接性能,研究采用绿光激光对锂电池极耳进行摆动焊接的工艺。通过对摆动振幅和摆动间距两个参数进行试验,发现摆动振幅能够延长激光焊接的时间,增大热量输入,由光束搅动熔池,扩大匙孔,达到减少气孔的作用,提高焊缝接头的接合强度。摆动振幅较小时,不能促进金属之间的互溶,熔池吸入的气体容易在熔池中形成气孔。摆动振幅增大,金属之间形成的固溶体充分结合,减少焊接缺陷。摆动间距影响焊缝接头的重叠率,会导致焊缝形貌烧蚀或输入热量不足。摆动间距较小时,虽然可以保证搅拌效果,但是重叠接头易导致熔池沸腾,加剧残留微小气孔。摆动间距增大,能改善焊接性能。摆动间距与焊缝接头强度成反比。通过研究,得到摆动振幅最佳范围为1.0~1.2mm,摆动间距最佳范围为0.5~0.7mm。
The lithium battery tab is made of highly reflective material.In order to improve the welding performance of the lithium battery tab,the swing welding process of the lithium battery tab using green laser was studied.Through the experiment of two parameters such as swing amplitude and swing spacing,it is found that swing amplitude can prolong the laser welding time,increase the heat input,stir the weld pool with the light beam,enlarge the keyhole,reduce the porosity,and improve the joint strength of weld joint.When the swing amplitude is small,the mutual dissolution between metals cannot be promoted,and the gas sucked in by the molten pool is prone to form pore in the molten pool.With the increase of swing amplitude,the solid solution formed between metals is fully combined,welding defect is reduced.The swing spacing affects the overlap rate of weld joint,which can lead to ablation of the weld morphology or insufficient heat input.Although the stirring effect can be ensured when the swing spacing is small,while the overlapping joint can easily cause the boiling of the molten pool to intensify residual tiny pore.The welding performance can be improved by increasing the swing spacing.The swing spacing is inversely proportional to the strength of weld joint.Through research,it is found that the optimal ranges of swing amplitude and swing space are 1.0~1.2 mm and 0.5~0.7 mm,respectively.
出处
《机械制造》
2024年第4期56-61,共6页
Machinery
基金
广东省重大科技专项(编号:2020A080201009)
广东省自然科学基金资助项目(编号:S2018010008735)。
关键词
锂电池
极耳
激光摆动焊接
工艺
研究
Lithium Battery
Tab
Laser Swing Welding
Process
Study
