STATE DETECTION METHOD OF SECONDARY BATTERY, STATE DETECTOR, AND SECONDARY BATTERY POWER SUPPLY SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a state detection method of a secondary battery for precisely detecting the state of the secondary battery by correcting a voltage change by a dark current, and to provide a state detector and a secondary battery power supply system.

SOLUTION: A correlation between a dark current value and a voltage correction value is created as a first formula in advance. When the correlation between the dark current value and the voltage correction value differs depending on the charge rate and temperature of the secondary battery, the first correlation formula includes at least any one of the charge rate and temperature of the secondary battery as one variable. The dark current is obtained by a prescribed method and is substituted into the first correlation formula, thus obtaining a voltage correction value.

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