The Power Lithium Battery Management System Based On STM32 MCU

The smog and haze weather of cities is mainly caused by automobile exhaust in northern section of China.Residents pay more attention on the new energy electric vehicles because its source of energy is extreme environmental friendly.The lithium ion battery has bee n widely utilized as new energy power owing to several advantages,such as high ener gy density and long cycle life.Nevertheless,it is required that the lithium ion battery should be connected in series with large-scale in the application of electric veh icle because of the res trictions of monomers.Obviously,the battery pack m anagement technology has becom e a constraint to the development of new energy vehicle.Thus,the battery management system is regarded as the current research focus in this field.This article illustrates the analysis and assessment of the lithium battery pool m anagement system.The outline of this essay has been shown in following:Initially,the basic functions and overall program procedure has been determined through the studies of operation characteristics of lithium iron phosphates.The paper conducts the classified study on the major balance of the topological in current situation.Besides,it implements theoretical analysis on the basis of capacitors,inductors and the balanced topology of transformers as well.It indicates that the topol ogy of the capacitor,which completely depends on the voltage difference between the imbalance monomers,is not suitable for lithium iron phosphate m anagement.Due to the consideration of costs and complexity of circuit design,it is not adopted in practice that the program of multilayer inductor which is based on inductor.The paper employs the counterattack topology,which is a transformer-based switching network.As a result,this program possesses several advantages,includes satisfied is olation characteristics,achieving the balanced m ulti-module,comparatively low costs and low difficulty of design.The article also describ es the hardware circuit design in battery m anagement system in terms of STM32F103VBT7.Additionally,it conducts the design of the cell voltage sampling circuit,temperature sampling circuit,the pow er supply circuit of i mposition,digital input,relay output circuit,current sampling circuit and CAN communication interface circuit.The Keil MDK development environment has been chosen for software developing and exploring.The software is able to not onl y monitoring the battery cell and temperature sampling parameters,but also controlling the temperature in battery op eration.Furthermore,the design also conducts the redistribution of identifiers and writing the CAN communication agreement.Last but not least,it controls the circuit of balanced modules and implements the fly-back converter peak current control.