Research And Design Of Battery Management System For Electric Vehicles

With the rapid growth of global car ownership,there is increasing pressure for energy supply and environmental balance.In recent years,countries have been devoting themselves to the development of other alternative energy sources in automotive applications to promote the development of new energy vehicles.Electric vehicle attract much attention due to its no pollution and zero emissions.As one of the main technical difficulties in the development of electric vehicles,the power battery technology directly determines the safety of the battery system and the entire vehicle,and indirectly affects the entire vehicle’s dynamic performance,as a result,the battery management technology has received extensive attention.Based on the vehicle development platform of an electric commercial vehicle,this paper carries out the research and matching design of the battery management system,which mainly includes the following contents:Firstly,this paper establishes an improved Thevenin battery equivalent circuit model,and identifies the battery model parameters.Then the battery model is verified based on the WLTP conditions.The test results show that the model has a better battery simulation effect than the traditional Thevenin battery.Secondly,the hardware part of the battery management system is matched.The electrical principle of the battery system,the selection of the central controller and the interface definition,and the computation and matching design of important components parameters are stated in detail.Thirdly,the application layer software of the battery management system is analyzed and designed,including architecture scheme and function requirements.Next,design principles,key algorithms and development design of each functional module are explained in detail.Finally,according to the V-mode development process,the functional verification of the designed battery management system is finished through the Model-in-Loop functional test,which effectively proves the correctness of the related functional software development in this paper.In addition,based on the ControlBase rapid prototyping platform,the Minimum battery control system bench is built,which can achieve real-time monitoring of the cell voltage of the battery module,and the total voltage on the bus current,as well as be used for the verification of high-voltage control logic hardware circuit and the SOC estimation.In summary,the main research content of this paper is the research and design of the battery management system for electric vehicles,and the origin design of hardware and software have been finished.The correctness of the relevant design of this paper has been verified by the Model-in-Loop functional test experiment.