新能源汽车动力电池用双组分聚氨酯灌封胶应用研究

Research on application of two-component polyurethane potting adhesive for new energy vehicle power battery

聚焦双组分聚氨酯灌封胶的应用性能,研究了双组分灌封胶混合后黏度随时间变化曲线,施胶时间、温度、胶层厚度对粘接强度的影响以及NCO/OH比例对粘接强度、硬度、拉伸强度、断裂伸长率等性能的影响。研究结果表明:双组分聚氨酯灌封胶混合后黏度低,可操作时间适中,混合均匀后30 min内施胶,对6系铝具有优异的粘接性;双组分聚氨酯灌封胶对NCO/OH比例耐受性宽,在n(—NCO)∶n(—OH)=(8~13)∶10范围内,硬度、拉伸强度、剪切强度等随着异氰酸酯组分混合比例的增加而增加,导热系数随异氰酸酯组分混合比例的增加而降低。整体而言,新能源汽车电池包用双组分聚氨酯灌封胶具有高导热性、高粘接性和良好的操作性能,对改善电池热管理、提高电池系统总成性能具有重要作用。

Focusing on the application performance of two-component polyurethane potting adhesive,the viscosity change with time after mixing of two-component potting adhesive,the effects of application time,temperature and thickness of adhesive layer on bonding strength as well as the effects of NCO/OH ratio on bonding strength,hardness,tensile strength,elongation at break and other properties were studied.The research results showed that the two-component polyurethane potting adhesive had low viscosity after mixing,moderate operation time,and excellent bonding properties to 6-series aluminum when applied within 30 min after uniform mixing.The two-component polyurethane potting adhesive had wide tolerance to NCO/OH ratio,and in the range of n(—NCO)∶n(—OH)=(8-13)∶10,the hardness,tensile strength and shear strength increased with the increase of mixing ratio of isocyanate component,while the thermal conductivity decreased with the increase of mixing ratio of isocyanate component.On the whole,the two-component polyurethane potting adhesive for battery packs of new energy vehicle had high thermal conductivity,high bonding properties and good operation performance,which played an important role in improving battery thermal management and improving the performance of battery system assembly.