Development On Lithium Iron Phosphate Battery Management System For Security Robot

With the continuous development of artificial intelligence,robots are becoming more and more popular.Among them,the security robot in the domestic promotion is also more and more.To ensure long-term work,security robots need to use a battery with large capacity and light weight.Therefore,as a power source for security robots,batteries are also attracting attention.As a new generation of power battery-lithium iron phosphate battery,has become the research object of this paper.Therefore,the battery management system(BMS)that can accurately and reliably collect lithium iron phosphate battery information,and simultaneously manage lithium iron phosphate battery,is the research content of this paper.Accurate estimation of the state of charge(SOC)of the battery is the key to the battery management system's ability to efficiently analyze and estimate the battery.In this paper,through the analysis of the development of the battery management system,combined with the structure,working principle,performance parameters and use characteristics of lithium iron phosphate battery,the lithium iron phosphate battery management system for the security robot is designed.It mainly includes the analysis of the functions required for the security robot lithium iron phosphate battery management system,hardware design,software design,PC design and system experiment and analysis of the battery management system.The specific achievements are as follows:1.The hardware design of Battery Management System.In this paper,the main controller STM32 and acquisition chip BQ76930 is designed to complete the collection of battery voltage,current and temperature informations.Considering that the equalization current is small,the equalization circuit design adopts passive equalization mode,and its equalization structure is simple.For battery charging and discharging,this paper designs a switching circuit based on MOSFET.Finally,the power supply required by the system is analyzed,and 5V and 3.3V power circuits are designed.2.The software design of Battery Management System.The main content of the software design part is about programming the SOC algorithm and writing the interface of the host computer.By comparing the existing SOC algorithm,this paper uses the combination of open circuit voltage and ampere-time integration,and considers the battery capacity attenuation and temperature parameters to correct the SOC.The serial communication and human-machine interface written by QT software under Windows used by the host computer complete the monitoring of battery status and charge and discharge control functions.3.I completed the battery management system experiment of joint debugging of hardware and software.By analyzing the experimental data,it can be seen that the lithium iron phosphate battery management system developed in this paper can accurately collect the battery voltage,current and temperature signals,and can well estimate the SOC of the lithium iron phosphate battery.