Research On The Battery Heat Dissipation Characteristics And Design Analysis On The Battery Box Of Electric Rubber-tyred Vehicles

Today,our country is advocating the style of energy conservation,emission reduction,environmental protection and vigorously promoting new energy vehicles.As a widely used explosion-proof rubber-tyred vehicles in coal mines,it is pressing to change the power system based on diesel engine.As a point of penetration by the electrification transformation of rubbertyred vehicles,enterprises begin to transform and upgrade coal mines vehicles.Because of the prominent safety performance and national regulations of lithium iron phosphate battery,most of the batteries used in commercial new energy vehicles are lithium iron phosphate battery.However,because lithium-ion battery could produce a considerable amount of heat quantity when working,so in order to avoid thermal runaway and other problems,it should be controlled.It,which is thermal management system of power battery in special working environment,is the key to improve explosion proof performance of electric rubber-tyred vehicles.Therefore,the following research will be carried out on the thermal simulation and liquid cooling of the lithium iron phosphate battery system of electric rubbertyred vehicles:(1)The current cooling modes of battery system are summarized,which applied by prevailing electric vehicles,and it is analysed,which are advantages and disadvantages of different cooling methods.(2)Based on analyzing the structure and principle of operation of the lithium iron phosphate battery;it,which is analyzed and researched of the heat generation mechanism and heat transfer characteristics of the battery,are to determined the primary source and heat transfer mode of the heat quantity,and it is opted an appropriate heat generation model on the basis of understanding the main performance parameters of lithium batteries.(3)There is computed and determined,which are the physical parameters required for thermal simulation;it is collected the data needed for simulation by experimental platform for battery basic performance testing,it,which is been simplified heat generation rate model,is combined with the SOC and the battery the fitting equations of the total internal resistance to get the heat generation equation,the battery heat source program is compiled based on the heat generation equation.On this basis the unit battery heat generation is analyzed under different discharge rates through simulation,and it,which is temperature characteristics,is analyzed different battery packs on 1 C discharge rate.(4)Based on thermal simulation results of different types of battery packs,the liquid cooling simulation of battery pack is carried out.And on the heat dissipation of the battery pack,it is analyzed the influence of parameters of the cooling liquid and the liquid cooling plate.It,which is response surface optimization model,is structured through the three-factor and threelevel test,on basis of the rapid acquisition of optimization results,it is simulated and verified.(5)It,which is the wall thickness of the explosion-proof power box,is determined by calculation,and the box is optimized.Based on finite element software,there are adopted which are static analysis,combined working condition analysis and modal analysis on the explosionproof power box,and it is established which is a three-dimensional model of the explosionproof power box and battery pack.