| In recent years,the problems of environmental pollution and energy consumption have become more and more serious,and the new energy industry has attracted more and more attention from the society.As one of the new energy industries,electric forklifts have become more widely used in industry.Electric forklifts usually use a power battery pack as the power source.Among them,the lithium-ion power battery pack gradually replaces the original lead-acid battery pack with its high energy density and fast charging mode.However,lithium-ion batteries have very strict requirements on operating temperature,and their performance will change with changes in operating temperature.If the temperature is too high or too low or the temperature distribution inside the battery pack is uneven,it will affect the working efficiency of the battery to a certain extent,and may even cause safety accidents such as spontaneous combustion or explosion of the battery.Therefore,cars powered by lithium-ion batteries are generally equipped with a battery pack thermal management system to effectively control the temperature of the lithium-ion battery pack,which plays a very important role in the efficient operation and safety management of the battery pack.This paper aims at the lithium iron phosphate battery used in the development of the electric forklift battery management system(BMS)project of the Clean Energy Research Institute of Temasek Polytechnic Institute in Singapore.The temperature characteristics of the battery were studied,and combined with the requirements for the use of electric forklift power battery packs,a new battery thermal management system and control strategy were designed,and the corresponding design requirements were given for each key component in the system.It provides theoretical basis for in-depth research and development.The main research contents of this article are as follows:(1)By referring to relevant literature at home and abroad,the internal structure and heating mechanism of the lithium iron phosphate battery are analyzed,and the performance parameters of the lithium ion battery are thoroughly understood and analyzed,which provides a theoretical basis for the subsequent establishment of a single battery simulation model and experimental testing.(2)An electrochemical-thermal simulation model of a single lithium iron phosphate battery was established to study the voltage curve and temperature rise of the lithium iron phosphate battery during charging and discharging at different ambient temperatures and discharge rates.(3)Build a single lithium iron phosphate battery charge and discharge experimental platform,through experimental tests to obtain the battery charge and discharge voltage and temperature data at different ambient temperatures and discharge rates,and compare the experimental results with simulation analysis results to verify the single iron phosphate The accuracy of the lithium battery electrochemical-thermal simulation model.(4)According to the design requirements of the thermal management system of the electric forklift power battery pack,an electric forklift battery thermal management system design plan was proposed,and specific design requirements were put forward for the key components in the plan;in addition,the battery pack liquid was established using 3D modeling software The structural model of the cold plate provides a reference for the design of the liquid-cooled plate of the battery pack. |
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