Virtual Battery Simulation Technology Based On Speedgoat

As the market share of electric vehicles increases year by year,the performance and safety of power batteries and BMS is the focus of current industry research,and the relevant national standards also put forward certain requirements on the performance and safety of batteries and BMS.When studying the external characteristics of batteries or using physical batteries to test BMS,physical batteries have the following defects :(1)long experimental time and harsh experimental conditions;(2)Low repeatability and high cost;(3)It is difficult to obtain batteries in a specific state;(4)Security is not guaranteed.In order to overcome the defects existing in the research and experiment of physical battery,the following research work was done in this paper to build the HIL simulation platform for the battery modeling and simulation of BMS test:Firstly,the factors affecting battery performance and safety in battery work are described,and the selection of battery model is illustrated according to the research on battery influencing factors.Because the second-order Thevenin equivalent circuit model can ensure better real-time characteristics and meet the accuracy of the battery model,this paper selects the second-order Thevenin equivalent circuit model to build the battery simulation model and explains the shortcomings and improvement methods of the model.Secondly,according to the parameter requirements of the second-order Thevenin equivalent circuit model,the principle and method of parameter identification are illustrated,and the influencing factors of model parameters are analyzed according to the parameter identification results.The cell model was established and verified by FUDS and DST working conditions.Finally,the battery overcharge and battery external short circuit faults were analyzed and the data models of these two faults were added into the cell model.Then,based on the single battery model,the equivalent circuit model of the series-parallel battery cell is created;for the problem of high complexity and inconsistency of the battery cell simulation operation,the series unit uses the model matrix to improve the running speed,and the normal distribution coefficient is used to achieve the inconsistency of the series cell cell;a method is proposed to simplify the battery cell model for solving the current problem of the branch of the parallel battery cell,and the branch current distribution is verified by Monte Carlo simulation Through the analysis of the coupling relationship between battery parameters and battery state inconsistencies,the influencing factors and terminal voltage performance laws of ohmic internal resistance,SOC,capacity and SOH inconsistency are elaborated.Finally,clarify the architecture of the whole HIL simulation platform,through the Simulink module is built,the battery model is established at the same time to complete the module connection of each unit;After that,the main interface of the upper computer is designed to control and display various parameters and signals in the battery simulation process.The characteristics of each hardware part of HIL test simulation platform are analyzed and the related connections between each component are completed.Battery model as the core,Speedgoat as the hub and design the main interface,the output results of HIL test simulation platform are analyzed and demonstrated,and the application characteristics of HIL simulation platform are explained.Finally,an example is used to analyze the application of BMS monomer voltage,total current and SOC precision detection.