Secondary-battery chargeable-limit detecting method and device of the same

摘要

A secondary-battery chargeable-limit detecting method that detects a charge rate of a chargeable limit and a device of the same are provided. In the chargeable-limit detecting method of the present embodiment, if it is determined that: a temperature measurement value Tm is higher than a temperature threshold Tt in step S3, a voltage measurement value Vm is higher than a voltage threshold Vt in step S4, a voltage excess rate RV is larger than a voltage excess rate threshold Rt in step S11, and an average current Ia is within a predetermined current threshold range in step S12; condition satisfied duration tc in which the conditions of the chargeable limit are satisfied is calculated in step S13. Then, if it is determined that the condition satisfied duration tc is longer than predetermined duration threshold tt in step S15, SOC of the chargeable limit is set in step S16.

主权项

1. A secondary-battery chargeable-limit detecting method of detecting a charge rate of a chargeable limit serving as an upper limit of a chargeable charge rate of a secondary battery at every cycle operation time-point of a predetermined cycle, comprising:
when reaching the cycle operation time-point,
measuring a voltage, a current, and a temperature of the secondary battery;calculating the charge rate of the secondary battery is calculated based on the current measurement value;calculating an average current corresponding to an average value of the current measurement value in a predetermined period;calculating a voltage excess rate representing a rate that the voltage measurement value becomes higher than a predetermined voltage threshold in a predetermined period;when all of conditions that: the temperature measurement value is higher than a predetermined temperature threshold, the voltage measurement value is higher than the voltage threshold, the average current is within a predetermined current threshold range including 0, and the voltage excess rate is larger than a predetermined voltage-excess-rate threshold are determined to be satisfied, calculating a condition satisfied duration in which the conditions are continuously satisfied; andwhen the condition satisfied duration is determined to be longer than a predetermined duration threshold, setting the charge rate as the charge rate of the chargeable limit.