Electric storage device management system, electric storage device pack, and method of estimating state of charge

摘要

An electric storage device management system includes a voltage sensor, a memory, and a controller. The voltage sensor detects a voltage across an electric storage device having a correlation between an open circuit voltage (OCV) and a state of charge (SOC) including a slight change region and a sharp change region. The memory stores information on correlation between OCV and SOC in the sharp change region. The controller is configured to: determine an OCV based on a voltage detected by the voltage sensor; determine whether the defined OCV is within the sharp change region; determine an SOC corresponding to the defined OCV based on the stored information stored if the defined OCV is within the sharp change region; determine the determined SOC as an estimated SOC; and prohibit the determining of the SOC as an estimated SOC if the defined OCV is out of the sharp change region.

主权项

1. An electric storage device management system comprising:
a voltage sensor configured to detect a voltage across an electric storage device having a correlation between an open circuit voltage (OCV) and a state of charge (SOC), the correlation including a slight change region and a sharp change region, the slight change region being a region in which a variation in OCV relative to the SOC is equal to or smaller than a reference value, the sharp change region being a region in which the variation is larger than the reference value; a memory storing at least information on correlation between OCV and SOC in the sharp change region; and a controller configured to:
define an OCV of the electric storage device based on a voltage detected by the voltage sensor;determine whether the defined OCV is within the sharp change region;determine an SOC corresponding to the defined OCV based on the information stored in the memory if the defined OCV is within the sharp change region;determine the determined SOC corresponding to the defined OCV as an estimated SOC; andprohibit the determining of the SOC corresponding to the defined OCV as an estimated SOC if the defined OCV is out of the sharp change region.