Design And Research On Lithium Battery Management System For Electric Forklift

In the face of increasingly severe energy and environmental problems,the development and use of new energy sources is imminent,and nowadays,electric energy is the most widely used.Benefiting from the widespread promotion of new energy sources around the world,electric forklifts have become more and more widely used due to their simple operation,good flexibility,low operating intensity,zero emissions and low noise.As the only power source for electric forklifts to move and work,how to maximize the performance of power battery,extend the service life,improve energy efficiency and ensure the safety of its use has become one of the technical bottlenecks for the promotion of electric forklifts.Based on the above reality,an efficient battery management system must be developed to accomplish the above work.In this paper,a lithium-ion battery with higher energy ratio and high environmental protection was selected as the application object of the battery management system.The software and hardware research and design of the battery management system are completed.The main work contents are as follows:(1)Through a brief analysis of the structure and working characteristics of the electric forklift,it is concluded that the lithium battery electric forklift must be equipped with a dedicated battery management system to manage charging and discharging,so as to ensure that it can complete its work safely,stably and efficiently.According to the functional requirements of the electric forklift,the overall design scheme of the lithium battery management system of the electric forklift is determined.(2)The modular design concept is used to design the hardware circuit of the battery management system.It mainly includes the selection of MCU and the design of minimum peripheral circuit,the selection and design of single voltage acquisition chip,the design of total voltage detection module,the design of temperature acquisition module,the design of liquid crystal display module,the design of charge and discharge control module,Communication module design,etc.(3)According to the hardware design and functional requirements of the lithium battery management system,the software design part of each module was completed.Draw the software design flow chart of each module,write the program based on C language and debug.In order to improve the electromagnetic interference resistance and system stability of the system while saving cost,the strategy of adding input and output validity judgment and applying filtering algorithm to key signals is added in the software design process.(4)Set up a system test platform to complete various performance tests of the lithium battery management system of the electric forklift.Through the analysis of experimental phenomena and data,data acquisition accuracy and system power consumption meet the design requirements,and the performance of the lithium battery management system meets the product requirements.