Online statistical estimation methods for the internal resistance of nickel-hydrogen batteries

Basing on the application of the dynamic batteries, the on-line resistance of nickel metal hydride batteries is calculated by using a statistical method in the article. By the comparison of statistics resistance and pulse resistance at different points of SOC (state of charge), the validity of the statistical method for the resistance of nickel matel hydride power battery is studied. Through the experiment,it shows that,the statical method is successful for the on-line resistance calculation of nickel matel hydride power battery in the different SOC. And the relative error is affected by the discretization and symmetry of the current: if the discretization or symmetry increases, the relative error reduces.