Patent ID: 11881567
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 0:
1. A battery system comprising:
a battery pack including a plurality of battery cells connected in series,
a monitoring unit configured to monitor a condition of the battery pack, and
a control unit configured to control at least a discharge of the battery pack, and
the monitoring unit includes:
a voltage sensor configured to measure a total voltage of the battery pack,
a current sensor configured to measure a total current of the battery pack, and
a temperature sensor configured to measure a temperature of the battery pack,
the control unit includes:
a calculating section configured to calculate capacity condition A of the battery pack at a first discharge cutoff voltage based on the total voltage and the total current,
an estimating section configured to estimate capacity condition B of the battery pack at the first discharge cutoff voltage based on the total current and the temperature,
a determining section configured to determine an occurrence of an over discharge based on the capacity condition A and the capacity condition B, and
a voltage changing section configured to change the first discharge cutoff voltage to a second discharge cutoff voltage that is higher than the first discharge cutoff voltage, when the occurrence of the over discharge is determined.