| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and device for precisely calculating a condition of a secondary battery mounted in a vehicle, for example, a residual life SOH of a storage battery. SOLUTION: According to this method, (a) the current flowing in a secondary battery and an open circuit voltage during an engine starting period are measured only when the secondary battery is first mounted in a vehicle, and an initial internal resistance and a limit internal resistance, which is a limit for starting the engine, are calculated using the measured values. (b) After the second time for mounting the secondary battery in the vehicle, the current flowing in the secondary battery and the open circuit voltage during engine starting period are measured for each engine starting, and the internal resistance is calculated using the measured values. (c) A residual life (SOH) of the secondary battery is calculated from the initial internal resistance, the limit internal resistance, and at least one of the internal resistances.
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