Battery module composed of cells is an organic component of battery system, So it is significant to research the influence of battery parameters inconsistency on the performance of different topological battery module which is of much value to design battery system. Taking six battery cells as an example, different kinds of topological battery modules are formed through different series parallel connection. Then the equivalent models of different topological modules are established based on Rint equivalent circuit model of battery. After that, the influence of battery internal resistance’s inconsistency on the equivalent internal resistance of different topological modules is analyzed by means of partial derivative method; the influence of battery internal resistance, capacitance and open circuit voltage’s inconsistency on the available capacity of different topology modules is studied though orthogonal test; and the influence of the inconsistency of battery voltage and internal resistance on the equivalent open circuit voltage of different topology modules is researched by derivative method and the orthogonal test. The result shows that the difference of the equivalent performance parameters of the different topological battery modules is obviously influenced by the inconsistency of the battery parameters, and has a certain regularity, which can provide reference for the separation and group of batteries .