Research On The Electric Car Lithium-ion Battery Charge Equalization Control

In today’s society,the new goals pursued by EVs has been gradually transformed into new motivators,energy-saving and environmental protection types with the rapid development of the level of science and technology,at the same time the development of lithium-ion battery is also a new,dynamic research trend.At present,lithium-ion battery has many superior characteristics compared to other traditional batteries,so it is widely used in new electric vehicles.In practical applications,we must take into account the small single-cell voltage low power and other issues,we usually pack the battery to be effective in series and parallel,to achieve for the electric car to provide hundreds of kilovolts of operating voltage in order to make the normal operation of electric vehicles.The existence of inconsistencies between the various battery cells,specifically in the voltage level,size and other attributes.Over time,the gap in inconsistencies has increased,making it difficult for cars to reach stable working conditions,so studying the balanced charging between lithium-ion batteries plays an important role in promoting the development of electric vehicles and the safe driving of electric vehicles.For lithium-ion battery balanced charging system for research and analysis,summarizes the advantages and disadvantages of the existing balanced control methods,then discussing the material characteristics of lithium batteries,working mechanism,chemical reaction,equivalent battery model and charging methods,and many other aspects,building a fast and efficient balanced charging system to improve inconsistencies between lithium batteries.The research content has the following points: First,according to the performance requirements of electric vehicles on the power battery,the characteristics of new battery materials.Secondly,research on the detection method of the state of charge of the single cell battery and its improvement.Third,summarize the existing charging method,.Finally,we have developed a control strategy for efficient and balanced battery charging.