DEVICE AND METHOD FOR CHARGING SECONDARY BATTERY

Disclosed is a charging apparatus and method of a secondary battery. The charging apparatus includes a control unit configured to determine an average ion concentration, a surface ion concentration and a solid phase potential for anode particles and an electrolyte potential in an anode, using a predefined electrochemical reduced order model. The control unit is further configured to determne a side rasction rate from the solid phose potential and the electrolyte potential. The control unit is futher configured to reduce the magnitude of the charging current applied to the secondary battery based on at least one selected from the limitations of a cutoff voltage, the surface ion concentration and the side reaction rate.