B787-800飞机锂电池起火事故原因及分析

探究飞机锂电池起火事故致险因素,有助于建立民用飞机锂电池热失控事故管控机制。遴选B787-800飞机锂电池起火典型事故,分别从事故发生地、故障部位、事故原因及安全建议等方面,对比分析3起典型锂电池火灾事故;从电池因短路造成热失控、电池组绝缘隔离差导致热传导、电池失效适航安全性评估缺乏等方面,分析锂电池火灾致险原因;最后,从电池绝缘阻火隔离结构设计、充电过高电压控制、电池破坏适航审定、改进电池外壳热防控设计等方面,提出锂电池热安全管控建议。

汽车火灾防治及消防灭火自动控制

在高速发展的背景下,大众生活质量直线提升,与此同时,拥有私家车的人群越来越多,但是由于大众对汽车火灾防护意识不足,所以经常会因为火灾防控工作效果不佳,导致火灾事故屡见不鲜。为此,需要从汽车结构进行分析,掌握汽车出现火灾的原因,并从结构角度出发,提出火灾防控方法,加强汽车火灾知识的宣传力度,提升民众防火意识,防止汽车火灾事故频繁出现。

In situ observation of cracking and self-healing of solid electrolyte interphases during lithium deposition

The growth of lithium(Li)whiskers is detrimental to Li batteries.However,it remains a challenge to directly track Li whisker growth.Here we report in situ observations of electrochemically induced Li deposition under a CO_(2) atmosphere inside an environmental transmission electron microscope.We find that the morphology of individual Li deposits is strongly influenced by the competing processes of cracking and self-healing of the solid electrolyte interphase(SEI).When cracking overwhelms self-healing,the directional growth of Li whiskers predominates.In contrast,when self-healing dominates over cracking,the isotropic growth of round Li particles prevails.The Li deposition rate and SEI constituent can be tuned to control the Li morphologies.We reveal a new“weak-spot”mode of Li dendrite growth,which is attributed to the operation of the Bardeen-Herring growth mechanism in the whisker’s cross section.This work has implications for the control of Li dendrite growth in Li batteries.