Research On Equalizing Charge Method Of On-board Charger For Electric Vehicles

In order to study the effective equilibrium strategy, prolong the service life of thebatteries group, equalize the quantity of electricity during the charging process, ensurethe safety of batteries, and meet the charging needs of various specifications of batteries,this paper introduces a kind of equalization scheme with the method of numericalsimulation.At first, the author obtained the curve of relationship between SOC and theelectromotive force of battery through the experiment data, and fits out of chargingcurve of SOC-U polynomial. Then the author builds a new model of battery through putthe SOC-U polynomial into the Matlab-Embedded-Function. At last, the author usesSingle end coaxial multiple windings fly-back converter as basic charging topology tosimulate the charging process of the model of external-power-supplied charging and theprocess of the model of self-powered charging, and gets the equalizing charge effect ofconvergence from dissimilarity. He proves the feasibility of this scheme by analyzingthe simulation results.The technique of numerical simulation has the advantages that it can simulate thereal process and has a easier method of adjusting and faster operation speed.Consequently, the paper runs the research of equalizing charging method with themethod of numerical simulation.