Simultaneous Estimation of model parameters and state-of-charge of Lithium-Ion Batteries using Recursive least squares and Modified Particle Filter

Estimating the status of battery charge (SOC) in lithium-ion batteries is important not only for optimum energy management but also for ensuring safe operation and preventing charge and discharge and thus reducing battery life. However, this parameter cannot be directly measured from the battery terminals. Therefore, SOC needs to be estimated. In this paper, the recursive least squares method (RLS) is used to estimate the battery parameters and the modified particle filter is used to estimate the SOC of lithium-ion batteries. The standard particle filter has the problem of particle degeneracy phenomenon, which reduces estimation accuracy. Therefore, in modified particle filter, the difference evolutionary algorithm and the Markov chain Monte Carlo) MCMC (method are applied to the standard PF, that makes the estimation of SOC more accurate and consistent.  In order to evaluate the performance of the proposed method, this method is compared with the classical methods. The results show the effective performance of the proposed method compared to other methods.