Research On Side Impact Safety Of Electric Bus In City

With the increasing number of electric buses in China,the safety of electric buses can not be ignored in order to reduce casualties.When a collision accident occurs during the operation of an electric bus,it will cause the battery pack to move,squeeze and explode dangerous conditions,which will cause a certain electrical damage and chemical damage to the crew.It is of great significance to study the side impact safety of the electric bus,because there is no forming standard in China at present.Therefore,it is of great significance to study the safety of the side impact,and it can not only guide the design of the body of the enterprise,but also be beneficial to the formulation of the relevant regulations.Based on the structural parameters and three dimensional model of a fully loaded city electric bus,this paper,referring to and combining the relevant laws and regulations at home and abroad,establishes its side rigid column collision and two different mass MDB barrier vehicle collision finite element analysis models and submits to LS-DYNA to simulate the collision process,through the analysis of the collision process.The stability and effectiveness of the three collision models are verified by the energy response characteristics and mass changes.Taking the passive safety of the whole vehicle as the research goal,the whole vehicle displacement cloud map,each assembly energy absorption and the member subsistence space intrusion are compared and analyzed in three side impact conditions.The results show that the right circumference frame and the bottom frame are the main deformation energy absorption components.The vehicle body deformation is smaller under the side impact condition of the980 kg barrier car,but it is in the side.The vehicle body deformation of the electric bus under the side collision of the column and the 1810 kg barrier car is large,the occupant’s living space has been seriously invaded,and the electric bus can not realize the self protection.Taking the safety of battery pack as the research objective,the energy absorption,extrusion deformation and relative bouncing extremum of the battery case under three kinds of side impact conditions are analyzed.The results show that the extrusion deformation of the battery box is larger under side column collision,and the possibility of fire and explosion is possible.Under the three side impact conditions,the relative runout of battery box is larger,and occupants are likely to be electrochemically injured.The structural optimization of urban electric bus is carried out by taking measures such as high strength steel,increasing energy absorption pipe,increasing wall thickness and adding collision beam by taking the hidden danger of car body safety and battery safety hidden danger under three side touch conditions.The optimized simulation results show that the energy absorption rate of each assembly is obviously improved,the body deformation and the skeleton invasion are improved,and the extrusion deformation and the relative pulsation of the battery box are reduced,and the effectiveness of the scheme is verified.