Research progress of energy equalization topology of power lithium battery pack

Abstract

At present, with the vigorous development of electric vehicle industry, power battery, as an important power source of electric vehicle, has attracted more and more attention of researchers. Among many kinds of power batteries, lithium-ion battery has been widely studied by many experts and scholars because of its clean, pollution-free and other advantages. As an important part of battery management, battery energy equalization technology makes the energy in the battery pack flow between single batteries by building an equalization circuit, which provides a strong guarantee for the efficient output and stable operation of lithium-ion batteries. This paper summarizes the current equilibrium topology of lithium-ion battery pack by summarizing and combing various types of existing equilibrium structures. According to the development process of equilibrium technology, this paper introduces the working principles, advantages and disadvantages of passive equalization, active equalization and active passive hybrid equalization structure, and summarizes the design idea of current equilibrium circuit by systematically summarizing the characteristics of the development of equilibrium circuit structure in recent years, According to the latest research progress, grasp the future development direction. Finally, according to the current balanced technology development, this paper puts forward personal views and prospects for the future balanced technology development.