The Safety Design Of Power Battery For Locomotive

In order to conform to the global green economy development model of natural resources and the sustainable utilization of natural resources,the energy sources of transit equipment have gradually changed from fossil fuels and power systems to a clean and efficient new energy field.The development of new energy locomotive equipment mainly focuses on power battery equipment.Compared with the electric vehicle power battery capacity,locomotive power battery is more powerful and the using environment is more complex,at the same time,the pure motor technology is still in the early development stage.The number of application cases is small and the layout is scattered,and the historical fault disaster statistics of various types of power batteries is limited.Therefore,it is very necessary to carry out a systematic safety analysis in the design stage of locomotive power battery products,and then implement the safety design and test to improve the safety performance of products.Firstly,this paper finished the basic design of the power battery system to obtain the system basic scheme and the simple model of the system to analyzed,and the preliminary hazard table of the subsystem is established to obtain the main disaster types of the system.Taking each disaster type as the top-level event,the fault tree analysis method is used to obtain the corresponding root causes,and the specific safety design of the basic system basic scheme is conducted with the root causes as the safety improvement measures.Finally,the structure of the battery box was simulated and analyzed by Solidworks Simulation software,the fire spread situation of the power battery system is simulated by Pyrosim software to construct the passive fire fighting system.Power battery system test according to standard Q /CRRC J 37.1-2019,GB / T21563-2018,ISO 7637-2:2011,GB / T 18655-2010 and QC / T897-2011.The simulation and test results meet the standard requirements,proving that the safety analysis and safety design of the power battery system achieve the expected results.In this study,Firstly through the safety analysis of the power battery system,the tree of various disaster faults of the system,summarized the root causes of various disaster types,clear the safety design direction of power battery equipment in the future.Secondly,in the simulation process,comparing the performance of sheet metal and frame structure types in the same application environment,the fatigue factor of frame structure is 3.75,which is greater than the sheet metal structure fatigue factor of 1.15,which is more likely to cause fatigue damage.Thirdly,through test and verification,it is proved that the graded protection design of battery module and battery box can combine air cooling,IP68 protection grade and structural strength.Finally,the safety analysis method,safety design method and test and inspection process of this study can provide a reference for the design of power battery equipment for similar locomotives.