Design And Development Of Green Iron-nickel Energy Storage Battery Management System

Energy depletion and serious pollution are still problems faced by today’s society,and the traditional power system is gradually developing towards intelligence.Green alkaline secondary battery as a new and efficient energy device,and has the advantages of green,high safety performance,relatively long life,etc.,is considered to have a good competitive advantage in the future,but also more and more attention,in order to adapt to the changes in the grid intelligence,as well as should new energy fluctuations,power supply instability and other problems,and at the same time in order to make the best performance of energy storage batteries,battery management system is In order to adapt to the intelligent changes of the power grid,as well as to cope with the problems of new energy fluctuation and stable power supply,and to make the best performance of the storage battery,the battery management system is indispensable.In this paper,we study the battery management system of iron-nickel energy storage battery to explore how to make it operate safely and effectively,and extend the service life of the battery as much as possible,as well as to realize the accurate monitoring of the ironnickel battery.In this thesis,we review the current status of battery management system research at home and abroad.Based on this,we study and discuss the battery management system from five aspects: battery characteristics testing,battery modeling,SOC estimation,battery equalization and system hardware and software development.In the thesis,we first test the characteristics of the iron-nickel energy storage battery,and establish a reasonable charging strategy for the charging and discharging of the iron-nickel battery by developing a specific experimental process plan,using battery testing equipment,and building a battery experimental platform to test the discharge multiplier characteristics,open circuit voltage test,aging characteristics test,internal resistance characteristics test,temperature characteristics test,and hybrid pulse test,through the internal resistance characteristics test for the charging and discharging of the iron-nickel battery to reduce the energy loss.Through the experimental data,we analyze the capacity of Fe Ni battery with the influence of discharge rate,temperature and charge/discharge times.By testing the characteristics of the Fe Ni battery,the relationship between the capacity of the battery and the discharge rate,temperature and number of times of charge and discharge is found,and a correction factor polynomial is established to correct the capacity characteristics of the battery under different environments.In the thesis,the overall design scheme and architecture of the iron-nickel energy storage battery management system are established from practical applications.A centralized topology is used.The hardware part uses the LTC6811-1 chip from ADI to collect the relevant parameters of the battery.The system realizes the functions of battery single cell voltage,charge/discharge current,ripple voltage and charging detection.The software part mainly designs data acquisition,temperature acquisition,SOC estimation algorithm and other programs by establishing software design architecture and sub-module function flow chart.The hardware and software of the system are continuously modified and improved according to the actual working condition of the battery during the development process.The final test results of the system show that the average relative error of voltage measurement is 0.56%,the average relative error of current measurement is 0.86%,and the average relative error of SOC estimation is 2.7%.