Research On Topology Design And Balance Control Of Emergency Plug And Pull Battery System

Mobile energy storage power vehicles are increasingly needed in life because of their advantages of quiet environmental protection,mobility and flexibility.Due to its high specific energy and strong charge and discharge capacity,lithium-ion batteries have become the preferred energy source for mobile energy storage power vehicles,and have been widely used in the field of mobile energy storage power vehicles.The inconsistency between the batteries caused by the plug-in mobile energy storage power vehicle is too large,which greatly affects the service life and stability of the battery pack.As the core control part of mobile energy storage power vehicles,the battery management system plays a huge role in ensuring battery safety,extending battery life,improving battery performance,improving system efficiency,and rapid fault detection.Battery balance control technology is a key component of the battery management system,through the balanced management of the energy source of the battery,improve the inconsistency of the battery pack,avoid the phenomenon of overcharge and overdischarge of the battery,and efficient battery balance management for mobile energy storage power supply The future application prospects of the car are crucial.Based on this,this paper summarizes the current research status of battery balancing technology by scholars at home and abroad,and clarifies that the research on battery balancing technology is carried out from two aspects: equilibrium topology and equilibrium control strategy.The main research contents are as follows:Firstly,the reliability of the battery topological connection is analyzed,and the secondorder RC equivalent circuit model is selected as the analysis model by comparing the common modeling methods of the battery,and the battery module is derived and verified that it can be represented by the battery cell model after series and parallel connection,and the internal parameters of the battery are identified according to the HPPC(Hybrid Pulse Power Characteristic)experiment Build a battery model in Matlab/Simulink.Formulate relevant working conditions to verify the accuracy of the model and establish a battery model that meets the needs.Secondly,the performance and causes of the battery pack are analyzed according to the inconsistency of the battery,and the battery state-of-charge SOC(State of Charge,SOC)is selected as the input of the equalization system according to the research object of this paper.Since the equilibrium variable SOC used cannot be directly measured,it is necessary to estimate SOC.Based on the extended Kalman filter algorithm,this paper uses the combination of algorithms to estimate battery SOC,which solves the problem that the traditional single estimation method has too large difference in SOC and is inaccurate in estimation.The battery estimation model is built in Simulink to complete the SOC estimation.Then,the specific equalization topology circuit is designed,and the structure and principle analysis of the commonly used equalization circuit are carried out,and the BuckBoost inductive active equalization circuit is determined by combining the characteristics of plug-in battery system with good scalability and easy modularity.Through the analysis of the traditional Buck-Boost equalization circuit,the shortcomings of the traditional circuit are improved,and then the working principle of the improved equalization circuit is analyzed,and the relevant parameters of the equalization circuit are analyzed and designed based on the actual working characteristics of the circuit,so as to improve the operation stability.Finally,taking battery SOC as the control signal of the equalization system,the algorithm based on fuzzy control combined with PID control reasonably adjusts the equalization current,and compares its equilibrium effect with the traditional control method,and then verifies the battery equalization experiment,which further explains the feasibility of the scheme from the perspective of practical application.The results show that the improved Buck-Boost active equalization circuit and dual-control coordinated equalization strategy can effectively improve the consistency of the battery pack and prolong the battery service life.