Risk Analysis And Health Characteristics Research Of Energy Storage Batteries For Rail Vehicles

As an emerging energy storage element,lithium-ion batteries related to urban rail transit are being used to absorb braking energy.The increasing number of on-board power batteries installed and the frequent fire and combustion accidents of power batteries have caused people’s worries.Safety is the key to the research and development of power battery.Its safety depends on many factors,including materials.Therefore,we need to conduct a security Risk analysis on the power battery system and Improve reliability.This article takes a certain type of power battery as an example to illustrate the potential safety hazards that may be encountered when it is used to store the braking energy of a train.First,analyze the heat generation mechanism of the power battery in combination with battery materials,and study its thermal stability.The function failure of the power battery caused by physical collisions and incorrect charging and discharging methods lead to overcharge and overdischarge.And describe the heat abuse problems caused by the abnormal heat exchange of the power battery,analyze the causes of thermal runaway;Sensors are then used to monitor the state of the battery and analyze it,and propose the power battery thermal runaway and fire warning Solution;Research the health status of the power battery was studied by battery cycle experiment,it can be seen that the capacity and energy decay quickly and the battery capacity decays more seriously.The sooner the charge-discharge cut-off voltage is reached;Finally,use the HAZOP method and guiding words to analyze the potential security hazards of the power battery system when the function fails,and to find out the cause and consequence of the hazard.Divide ASIL levels and determine safety goals.