热闭孔微球隔膜对高镍高硅软包电池热安全改善研究  

Study on thermal safety improvement of high nickel and high silicon pouth-type batteries by thermal closed cell microsphere diaphragm

作　　者：黄佳苑 谢英朋 赵瑞瑞 刘建华 刘金成 冀亚娟 HUANG Jiayuan;XIE Yingpeng;ZHAO Ruirui;LIU Jianhua;LIU Jincheng;JI Yajuan(Huizhou Yiwei Lithium Energy Co.,Ltd.,Huizhou Guangdong 516006,China)

机构地区：[1]惠州亿纬锂能股份有限公司,广东惠州516006

出　　处：《电源技术》2025年第3期555-562,共8页Chinese Journal of Power Sources

摘　　要：高比能锂离子电池热安全问题凸显,亟待解决方案。基于PE微球的热闭孔隔膜(PX02隔膜),在120℃以下能快速热响应,关闭锂离子传输通道,防止电池进入自加温的热失控状态。研究表明:PX02隔膜实验组电池在高温外短路、8.4 V过充和150℃热滥用下较PX00隔膜对照组电池热失控温升降低约10~20℃,热失控时间延缓11 min;通过电芯ARC热失控测试结果显示PX02隔膜实验组电池较商业化陶瓷隔膜对照组电池起始温度(θ_(1))升高了19℃,热失控触发温度(θ_(2))升高了16℃,延缓了电池热失控起始时间,安全性更高。此外,在电性能方面,PX02隔膜表现出较好的倍率及循环性能、高温存储性能。因此,PX02隔膜有望改善高镍/高硅体系商业化面临的热安全问题,加速下一代高比能硅基电池产品的落地和产业化。The thermal safety problem of high specific energy lithium-ion battery is prominent and needs to be solved urgently.The thermal closed-cell diaphragm(PX02 diaphragm)based on PE microspheres can rapidly respond to heat below 120℃,closing the lithium ion transmission channel and preventing the battery from entering a self-heating thermal runaway state.The results show that the thermal runaway temperature of the PX02 diaphragm group is reduced by about 10-20℃and the thermal runaway time is delayed by 11 min compared with that of the PX00 diaphragm group under high temperature external short circuit,8.4 V overcharge and heat abuse at 150℃.The ARC thermal runaway test results show that the initial temperature(θ_(1))and thermal runaway trigger temperature(θ_(2))of the battery in the PX02 diaphragm group increased by 19℃and 16℃compared with the commercial ceramic diaphragm control group,delaying the initial time of thermal runaway of the battery and making it safer.In addition,in terms of electrical properties,the PX02 diaphragm shows better magnification,cycle performance and high temperature storage performance.Therefore,the PX02 diaphragm is expected to improve the thermal safety problems faced by the commercialization of high nickel/high silicon systems,and accelerate the landing and industrialization of the next generation of high specific energy silicon-based battery products.

关 键 词：热闭孔微球隔膜 热响应功能 安全性 ARC热失控 高镍/高硅锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动]