Patent ID: 9551757
Date: 2017-01-24
CPC Classifications: G01R

Claim:
1. A remaining battery life measuring device, comprising: a first estimator configured to generate a first estimation of a state of charging of a battery in a closed circuit based on an estimate of an open circuit voltage of the battery in the closed circuit; a second estimator configured to generate a second estimation of the state of charging of the battery in the closed circuit using at least one of a charge current and a discharge current of the battery in the closed circuit; a correction unit configured to generate a correction value on the state of charging estimated by the second estimator, based on the first estimation of the state of charging generated by the first estimator or an output state of charging, estimate a reliability value associated with the first estimation or the output state of charging, based on a determined error rate associated with the first estimation, increase the correction value if the estimated reliability value is greater than a first value, and decrease the correction value if the estimated reliability value is less than a second value; and a state of charging (SOC) processing unit configured to calculate the output state of charging using the second estimation of the state of charging generated by the second estimator and an accumulated correction value, wherein the accumulated correction value is generated based on the correction value, such that the SOC processing unit calculates the output state of charging based on both the first estimation of the state of charging and the second estimation of the state of charging.