Title:
SOC ESTIMATION DEVICE AND SOC ESTIMATION METHOD
Document Type and Number:
WIPO Patent Application WO/2014/030464
Kind Code:
A1
Abstract:
The present invention relates to an SOC estimation device and an SOC estimation method for estimating the SOC (charging state) of a secondary cell capable of being charged and discharged, whereby the SOC is accurately estimated and the time required for the estimation of the SOC is reduced. A measuring unit (1-1) measures the value of the OCV for each cell (C1 to C5) when a bypass current flowing in a bypass circuit (B1 to B5) starts to discharge, and measures the discharge time of the bypass current. A fluctuation transition estimation unit (1-2) estimates the transition of the fluctuation in the value of the OCV for a cell after the start of discharge of the bypass current on the basis of known SOC-OCV characteristic information that represents a correlation between the SOC and the OCV of a cell, and the value of the OCV when the bypass current starts to discharge. An OCV value estimation unit (1-3) estimates the value of the OCV when the discharge of the bypass current is suspended on the basis of the transition of fluctuation in the value of the OCV. An SOC value estimation unit (1-4) estimates the value of the SOC when the discharge of the bypass current is suspended from the value of the OCV estimated by the OCV value estimation unit (1-3) on the basis of the SOC-OCV characteristic information.
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Inventors:
ADANIYA HIROKO (JP)
TSUZUKI TAKAHIRO (JP)
TSUZUKI TAKAHIRO (JP)
Application Number:
PCT/JP2013/069349
Publication Date:
February 27, 2014
Filing Date:
July 17, 2013
Export Citation:
Assignee:
TOYOTA JIDOSHOKKI KK (JP)
International Classes:
G01R31/36; H01M10/48; H02J7/00; H02J7/02
Foreign References:
| JP2010286445A | 2010-12-24 | |||
| JP2010220380A | 2010-09-30 | |||
| JP2009089566A | 2009-04-23 |
Attorney, Agent or Firm:
OSUGA, Yoshiyuki (JP)
Yoshiyuki Osuge (JP)
Yoshiyuki Osuge (JP)
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