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 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, and the sharp change region being a region in which the variation is larger than the reference value.

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, and the sharp change region being a region in which the variation is larger than the reference value; a memory storing information on correlation between OCV and SOC in the sharp change region; and a controller which executes:
defining an OCV of the electric storage device;determining whether the defined OCV is within the sharp change region; andif the defined OCV is within the sharp change region, then performing an SOC adjustment which includes determining an SOC corresponding to the defined OCV based on the information stored in the memory, and determining the determined SOC corresponding to the defined OCV as an estimated SOC.