| 摘要 |
An apparatus for estimating a state of charge (SOC) of a secondary battery. A control section of a battery controller (ECU) computes a total amount of electric discharge of a secondary battery and compares the total amount of electric discharge with a predetermined threshold value. The threshold value is set so as to fall within a range of; for instance, 400 Ah to 1600 Ah. When the total amount of electric discharge is equal to or greater than the predetermined threshold value, an open-circuit-voltage (OCV)-SOC map is replaced with a map achieved in a state where a memory effect is saturated. When the total amount of electric discharge is smaller than the predetermined threshold value, a correction is made to the map so as to achieve a map that is a mixture consisting of the OCV-SOC map achieved in an initial state and the OCV-SOC map achieved in the saturated state at a predetermined ratio. The SOC is estimated by use of the corrected map.
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