| 摘要 |
PROBLEM TO BE SOLVED: To provide an over-discharging detecting method of a secondary battery capable of making an accurate over-discharging detection without being affected by temperature difference or a voltage measurement timing. SOLUTION: A voltmeter 20 and thermometer 28 are arranged for each battery block 14 constituting a battery pack 10 to measure each voltage and temperature. A current of the battery pack is measured with an ammeter 22. The voltage is detected from an SOC of the battery at a voltage detecting part by integrating the current, an inside resistance and a polarized voltage are detected form the voltage and the temperature, and an estimated voltage of each battery block 14 is found by a voltage estimation part from the voltage, inside resistance and polarized voltage. An over-discharging detection part 38 detects the presence of the over-discharging form the difference between the estimated voltage and an actual voltage measured by the voltmeter 20. COPYRIGHT: (C)2003,JPO
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