Research And Design Of Battery Management System For AGV

In recent years,AGV has been rapidly developed and widely used as a handling robot.As the power source of AGV,lithium-ion battery has the advantages of zero pollution emission,high reliability,easy operation and maintenance,and is gradually being widely used.However,when using a lithium-lithium ion battery,it is necessary to take corresponding safety measures to achieve safe charging and discharging,and also to perform a more accurate SOC estimation on the lithium battery to ensure the safety and stability of the lithium ion battery.First of all,this paper expounds the background and significance of this research.Through reviewing relevant knowledge,it introduces the research status of battery management systems at home and abroad;and analyzes and introduces the various principles involved in this topic,such as lithium batteries.Relevant characteristics and working principle,charge and discharge characteristics of lithium battery,etc.;based on the definition of SOC estimation of lithium battery,a brief analysis of the influencing factors of SOC estimation of lithium battery;by enumerating common SOC estimation methods,such as current integral Method,open circuit voltage method,etc.,compare and analyze various SOC estimation methods,and finally determine the SOC estimation method selected by the impedance tracking algorithm for this topic.The algorithm combines voltage-based electricity monitoring and coulomb counting based power monitoring.The advantage of maximizing the estimation accuracy of the SOC can achieve more accurate power estimation and control of the lithium battery.Secondly,according to the requirements of the AGV for the battery management system,the selected impedance tracking algorithm is combined to design a battery management system.The program mainly uses the BQ79630 chip combined with the active equalization circuit composed of AO3415 and MM1Z5V1 to build the analog front-end module.It can mainly measure the voltage,current and temperature of 6-10 series single lithium battery to realize the lithium battery of each unit.Front-end control of power balance and charge and discharge;the main control module of BQ78350 chip construction system,through the small MCU integrated in the chip,mainly to accurately SOC estimation and accurate battery working state monitoring of the battery pack,combined with the analog front-end module,Realize the balance of lithium battery pack power and lithium battery voltage,current and temperature protection;build front-end charge and discharge module with QB76200 chip,combined with analog front-end module to realize the control of battery charge and discharge,ensure system charge and discharge safety Sex and stability.At the same time,according to the designed battery management system solution,the corresponding PCB drawing and production were completed.Finally,the test hardware platform was built with EV2300,and the bq Studio test software was used to test and analyze the parameters of the battery management system,the charge and discharge characteristics,and the short-circuit protection characteristics of the designed battery management system.The rationality and feasibility of the system design are verified...