摘要
针对当前汽车动力锂电池极耳焊接质量问题,通过选取TU1铜镍合金与6061铝合金材料,固定两组工艺参数设计试验组,分析其焊接成形力学性能与组织之间的关系。以焊接速率50 mm/s为前提,激光功率1100 W时抗拉剪强度最佳(1380 N),激光功率1250 W时显微硬度(133 HV),二者均表现激光功率增加先增后减的趋势,原因是铜铝金属间化合物的生成量影响焊接后的力学性能表现;以焊接功率1100 W为前提,激光速率60 mm/s时抗拉剪强度最佳(1323 N),激光功率1250 W时显微硬度最高(120 HV)。在焊接能量较小工况下,极易产生未熔区和少量气孔,反之表观焊接质量较好,但出现烧蚀现象和大量气孔,主要机制为铜镍合金与铝合金虽局部反应程度较深,但不够充分将致气孔形成和过焊。
Aiming at the current welding quality of lithium battery tabs for automobiles,by selecting TU1 copper-nickel alloy and 6061 aluminum alloy materials,two sets of process parameters were fixed to design an experimental group,and the relationship between the mechanical properties of welding and the structure was analyzed.Taking the welding speed of 50 mm/s as the premise,the tensile shear strength is the best(1380 N)when the laser power is 1100 W,and the microhardness(133 HV)when the laser power is 1250 W,both of which show that the laser power increases first and then decreases.The reason is that the generation of Cu-Al intermetallic compounds affects the mechanical properties after welding;on the premise of welding power of 1100 W,the tensile shear strength is the best(1323 N)when the laser rate is 60 mm/s,and the laser power is 1250 W when the microhardness is the highest(120 HV).Under the condition of low welding energy,it is easy to produce an unmelted area and a small number amount of pores.On the contrary,the apparent welding quality is good,but ablation and a large number of pores appear.The main mechanism is that although the local reaction degree of copper-nickel alloy and aluminum alloy is relatively high deep,but not sufficient,will cause porosity and over soldering.
作者
王智海
陈力
WANG Zhihai;CHEN Li(Department of Automotive Technology,Zhejiang Agricultural Business College,Shaoxing,Zhejiang Province,312088,China)
出处
《电池工业》
CAS
2022年第6期286-291,共6页
Chinese Battery Industry
基金
2022年浙江农业商贸职业学院科研项目(青年专项):“汽车动力锂电池极耳激光焊接成形和组织性能研究”(KY202221)
关键词
电池极耳
激光焊接
焊缝组织
力学性能
微观形貌
battery tabs
laser welding
weld structure
mechanical properties
micromorphology
