Patent ID: 9213069
Filing Date: 2015-12-15
Classification: G01R,H01M,Y02E

Abstract:
1. An apparatus for estimating the power of a secondary battery, comprising: a sensor configured to measure a discharge current of a secondary battery comprising a cathode including a blended cathode material, an anode, and a separator, the blended cathode material including at least a first cathode material and a second cathode material, and an operating voltage range of the first cathode material being higher than an operating voltage range of the second cathode material; and a control unit configured to estimate a state of charge of the secondary battery, determine a discharge voltage of the secondary battery using a first resistance predefined corresponding to the state of charge under a first condition in which a magnitude of the discharge current is smaller than a magnitude of a critical current and a second resistance predefined corresponding to the state of charge under a second condition in which the magnitude of the discharge current is larger than the magnitude of the critical current, and determine the power of the secondary battery from the determined discharge voltage and the measured discharge current.