锂电池隔膜拉伸条件对其特性的效应分析  

Study on effect of stretch condition on characteristics of lithium battery separator

作　　者：马文献 常红祥 徐锋 徐勇 MA Wenxian;CHANG Hongxiang;XU Feng;XU Yong(Hebei Gellec New Energy Science&Technology Co,Ltd,Handan 056000,China)

机构地区：[1]河北金力新能源科技股份有限公司,河北邯郸056000

出　　处：《中国塑料》2025年第2期54-59,共6页China Plastics

摘　　要：探讨了锂电池隔膜的拉伸行为对隔膜微孔结构、强度和热收缩的影响效应。通过试验设计(DOE)发现,拉伸温度对孔隙率正效应最强,拉伸倍率次之,且在8.5~10倍时,效应减弱;同时,拉伸速率与拉伸温度有较强的交互效应。另外,拉伸因子与孔径建立的回归模型相关系数达98.6%。拉伸温度对隔膜强度的负效应最强,拉伸倍率正效应次之;同时,拉伸倍率在8.5~10倍时,效力减弱,拉伸速率在37.5%/s附近有最佳强度响应值。此外,通过形貌分析解释了成孔和强度的影响效应。发现拉伸温度对隔膜热收缩负效应最强,拉伸倍率正效应次之。同时,当拉伸倍率在7~8.5倍时,效应对冲减弱,且拉伸温度与拉伸倍率有较强交互作用。隔膜结晶度与热收缩的回归系数为81.1%,隔膜结晶度越大,热收缩越小。In this paper,the effects of stretch behavior on the micropore structure,strength and thermal shrinkage of lithi-um battery separator were investigated.The design of experiment verification and effect analysis indicated that the stretch temperature had the strongest positive effect on the porosity of separator,followed by its stretch rate.The effect weak-ened at stretch rates between 8.5 and 10 times.Meanwhile,the stretch rate and stretch temperature had a strong interac-tion effect.In addition,the correlation coefficient between the stretch factor and regression model established by the pore size was 98.6%.The negative effect of stretch temperature on the strength of the diaphragm was the strongest,fol-lowed by the positive effect of stretch magnification.When the stretch rate of the separator was 8.5~10 times,its effica-cy was weakened.The separator obtained the best strength response value at a stretch rate of 37.5%/s.In addition,the effects of pore formation and strength were explained through topography analysis.The negative effect of stretch temper-ature on the thermal shrinkage of the diaphragm was the strongest,followed by the positive effect of the stretch rate.The hedging of the effect weakened at a stretch rate of 7~8.5 times,and the stretch temperature and stretch rate had a strong interaction.The regression coefficient between separator crystallinity and thermal shrinkage was 81.1%.The larger the separator crystallinity,the smaller was the thermal shrinkage.

关 键 词：锂电池隔膜 拉伸取向 孔径 强度 热收缩 

分 类 号：TQ320.6[化学工程—合成树脂塑料工业]