Noise Propagation Analyzes in the State of Charge Estimation Models of Lithium ion Batteries

Lithium-ion batteries have several applications in the energy, telecommunications, and electric vehicle sectors. Due to their high performance, they are often being used. However, these accumulators have limitations related to safety problems, mainly due to the variation of the internal parameters that cause the battery to explode in an untimely manner. In order to evaluate and quantify the statistical variations of the battery voltage in relation to the statistical variations of the charge/discharge current, in this article, an evaluation procedure of the voltage noise propagation based on the Monte Carlo Simulation method was developed. For this purpose, a computational model was used in the Matlab/Simulink tool. From the results, it was observed that the voltage at the terminals contains a higher standard deviation when the State of Charge values are less than 15% and greater than 80%. In addition, the standard deviation level of the battery voltage increases with the value of the discharge current.