Study On Estimation Of Charge State Of Lightweight Batteries With Low Power Consumption

With the continuous progress of electronic technology,People’s Daily life is gradually intelligent,the volume of portable electronic equipment is reduced and the function is improved,more and more portable electronic equipment is used in various industries and life scenes.In the Internet of things and wireless sensor networks,for example,large-scale deployment of device nodes is common in harsh environments.Since the equipment nodes are deployed in remote and harsh environments,battery replacement is difficult and secondary battery use adds to the cost.In the case of limited battery energy,in order to reduce the cost,the battery needs to work for a long time or improve the energy utilization.At first,this paper studies the energy and low power consumption equipment battery charged state of(SOC)of the research background and significance,as well as the status quo at home and abroad,and analyzes the research status of battery charged state,then based on the principle of alkaline battery and the related theory of knowledge organization structure,small current discharge,the discharge characteristics of a detailed study,based on this,to complete the following contents:(1)study on the discharge characteristics of alkaline battery with small current for low-power equipment.Alkaline batteries for the constant resistance and constant flow of small current discharge experiment,the analysis of the residual capacity of battery voltage,consumption capacity,and charged state and the largest capacity in the process of battery discharge change relations,and has carried on the thorough analysis to the influence of these parameters,and found that the discharge current of the battery the influence is bigger,the characteristics of the battery voltage of the battery Vt curves of state with charged battery SOC is concentrated,battery terminal voltage Vt and electromotive force is very regular,the changes of the EMF and battery electromotive force EMF state with charged battery SOC has better consistency.(2)a lightweight SOC evaluation model based on terminal voltage Vt was proposed.According to the discharge characteristics of the alkaline battery,the relationship curve between the terminal voltage and the charged state of the battery is found.The existing models for low-power equipment are analyzed,and the vt-soc model and the existing model are verified by experiments on the constant resistance discharge and wireless sensor node discharge of alkaline batteries.(3)a lightweight charged state evaluation model(vt-emf-soc)based on EMF was proposed.During the intermittent discharge of constant resistance and constant current,the change relationship between the terminal voltage Vt and EMF,as well as the change relationship between EMF and SOC was found.The experimental data of constant resistance and constant current intermittent discharge of alkaline battery were modeled.Firstly,the terminal voltage approximate EMF model of EMF was established to estimate the EMF according to the battery terminal voltage Vt,and then the SOC evaluation model of SOC was established to estimate the SOC according to the EMF.Also using alkaline batteries constant resistance discharge and discharge experiment of wireless sensor node,to verify the Vt-EMF-SOC model,and compared with the existing model,found from several aspects based on the voltage of the error of the EMF model than based on the modeling error is small,Vt-EMF-SOC model evaluation of the charged state of SOC higher precision,but also illustrates the lightweight SOC model based on EMF,is suitable for the alkaline batteries provide the power of the charged state evaluation of low power consumption equipment.