为研究航空变压环境下锂离子电池热失控所释放气体种类及其安全性,采用自主搭建密闭式变压实验舱开展相关实验,在不同压力环境下(101 k Pa、70 k Pa、30 k Pa)对100%荷电状态(SOC)三元锂离子电池热失控特性进行研究,记录锂电池在热失控...为研究航空变压环境下锂离子电池热失控所释放气体种类及其安全性,采用自主搭建密闭式变压实验舱开展相关实验,在不同压力环境下(101 k Pa、70 k Pa、30 k Pa)对100%荷电状态(SOC)三元锂离子电池热失控特性进行研究,记录锂电池在热失控过程中的温度及密闭实验舱的压力变化,比较不同压力环境下的热失控特征。把得到的热失控原位气体分别通入气相色谱-质谱联用仪和自主搭建的锂电池爆炸极限测试平台,对锂电池热失控产气分别进行成分分析及爆炸风险分析。研究结果表明:随着环境压力的降低,电池越早触发热失控,其产生高温和气体冲击的危险性也随之降低。不同压力环境下产生的气体成分及含量也有所不同,随着环境压力的降低,CO_(2)含量减少,而不饱和烃C_(4)H_(8)、C_(4)H_(6)、C_(5)H_(10)等气体含量增加,而这也正是低压环境下爆炸风险更大的原因。锂离子电池热失控气体爆炸上下限范围随压力降低而增大,从而造成更大的风险。研究结果可为锂离子电池在航空领域安全性研究提供理论依据,为电池的安全防控提供数据参考。展开更多
In this paper, intrinsic safety and positive security distance control for an up/down elevator which extracts the materials from an underground coal mine is approached. For a better understanding of intrinsic safety a...In this paper, intrinsic safety and positive security distance control for an up/down elevator which extracts the materials from an underground coal mine is approached. For a better understanding of intrinsic safety and positive security, the first part of the paper describes the potential risk the workers are facing while working in dangerous environments like coal mining with “grisou” atmospheres and what the conditions of an unfortunate event to take place are. We presented the diagram and working principle for intrinsic safety equipment used in potential explosive areas based on which we modeled and simulated the intrinsic and positive security distance control in order to get a software solution for it. We created an algorithm and simulated the process in Matlab Simulink. The simulation results done in Matlab Simulink were then entered into a Moeller PLC using a ladder-type programming language. For protection against explosive atmospheres, the PLC is inserted into a metal housing with intrinsic protection and Positive Security.展开更多
文摘为研究航空变压环境下锂离子电池热失控所释放气体种类及其安全性,采用自主搭建密闭式变压实验舱开展相关实验,在不同压力环境下(101 k Pa、70 k Pa、30 k Pa)对100%荷电状态(SOC)三元锂离子电池热失控特性进行研究,记录锂电池在热失控过程中的温度及密闭实验舱的压力变化,比较不同压力环境下的热失控特征。把得到的热失控原位气体分别通入气相色谱-质谱联用仪和自主搭建的锂电池爆炸极限测试平台,对锂电池热失控产气分别进行成分分析及爆炸风险分析。研究结果表明:随着环境压力的降低,电池越早触发热失控,其产生高温和气体冲击的危险性也随之降低。不同压力环境下产生的气体成分及含量也有所不同,随着环境压力的降低,CO_(2)含量减少,而不饱和烃C_(4)H_(8)、C_(4)H_(6)、C_(5)H_(10)等气体含量增加,而这也正是低压环境下爆炸风险更大的原因。锂离子电池热失控气体爆炸上下限范围随压力降低而增大,从而造成更大的风险。研究结果可为锂离子电池在航空领域安全性研究提供理论依据,为电池的安全防控提供数据参考。
文摘In this paper, intrinsic safety and positive security distance control for an up/down elevator which extracts the materials from an underground coal mine is approached. For a better understanding of intrinsic safety and positive security, the first part of the paper describes the potential risk the workers are facing while working in dangerous environments like coal mining with “grisou” atmospheres and what the conditions of an unfortunate event to take place are. We presented the diagram and working principle for intrinsic safety equipment used in potential explosive areas based on which we modeled and simulated the intrinsic and positive security distance control in order to get a software solution for it. We created an algorithm and simulated the process in Matlab Simulink. The simulation results done in Matlab Simulink were then entered into a Moeller PLC using a ladder-type programming language. For protection against explosive atmospheres, the PLC is inserted into a metal housing with intrinsic protection and Positive Security.
