新能源汽车电池大模组Busbar激光焊接工艺探究

Effect of laser cleaning process on the performance of flat copper wire solder joints

针对新能源汽车电池大模组的生产需求,对Busbar及电芯极耳进行激光焊接试验,改变激光功率、焊接速度等工艺参数,比较搅拌激光焊和无搅拌激光焊接工艺,并考察了焊缝的组织形貌、孔隙率、抗剪强度等性能。研究发现,Busbar激光焊接优化工艺为中心功率3400 W,外环功率1800 W,焊接速度25 mm/s,离焦量+1 mm,焊接接头成形良好。比较搅拌激光焊接和无搅拌激光焊接工艺,Busbar激光搅拌焊接接头最大剪切强度为164 MPa,无搅拌激光焊接接头最大剪切强度为152 MPa,从而证明激光搅拌焊接工艺能够显著优化Busbar接头的焊接质量。

For the production demand of new energy vehicle battery large module,laser welding test was carried out on Busbar and electrode lugs of the core,changing the laser power,welding speed and other process parameters,comparing the stirred laser welding and non-stirred laser welding process,and examining the organization and morphology of the welded joints,porosity,shear strength and other properties.It was found that the optimized process of Busbar laser welding was 3400 W for the center power,1800 W for the outer ring power,25 mm/s for the welding speed,+1 mm for the defocusing amount,and the welded joints were well formed.Comparing the stirred laser welding and non-stirred laser welding process,the maximum shear strength of Busbar laser stirred welded joints is 164 MPa,and the maximum shear strength of non-stirred laser welded joints is 152 MPa.The joints obtained by laser stirred welding compared to non-laser welding have a lower porosity,a better tissue morphology,and better mechanical properties,and therefore are the most suitable for Busbar welding process.