As the application of power lithium batteries becomes more and more extensive, in order to ensure that the battery pack can be charged and discharged safely and efficiently, a balanced topology is often used to control the parameter inconsistency between battery cells. However, equalization topology is usually unable to take into account the characteristics of high equalization efficiency, fast equalization rate and easy control, so it is particularly important to study the influence of various circuit parameters on equalization effect.Based on the working principle of the balanced topology, this paper establishes the equivalent circuit model of the two working modes, and analyzes the influence of the circuit parameters in the balanced topology on the equalization rate and efficiency. Using matlab/simulink to build a four-cell equalization system based on the same-core multi-winding equalization topology verify its equalization function, building an experimental platform for the same-core multi-winding equalization topology verify the influence of related circuit parameters on the equalization effect .