Dynamic model of lithium polymer battery – Load resistor method for electric parameters identification

•This paper describes a novel and simple test-procedure to derive electric parameters of a lithium-polymer battery model.•The major contribution of this work is a rapid method for identifying electrical parameters by using only one resistor.•The parameters identification is made with a good tradeoff between accuracy and complexity.•The experimental setup is very simple and requires no complicated hardware or software tools.

Maximum battery runtime and its transients behaviors are crucial in many applications. With accurate battery models in hand, circuit designers can evaluate the performance of its developments considering the influence of a finite source of energy which has a particular dynamics; as well as the energy storage systems can be optimized. First, this work describes a complete dynamic model of a lithium polymer battery. In the sequel a simple and novel procedure is used to obtain the electric parameters of adopted model with the advantage of using only one resistor to represent the battery load and a pc-connected multimeter. The methodology used to identify the parameters of the battery model is simple, clearly explained and can be applied to various types of batteries. Simulation and experimental results are presented and discussed, demonstrating the good performance of the proposed identification methodology.