Title:
BATTERY STATE OF CHARGE ESTIMATING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/155247
Kind Code:
A1
Abstract:
This battery state of charge estimating device is provided with: a storage unit 3 which stores an SOC-OCV curve for charging, an SOC-OCV curve for discharging, and internal ratio information; and a state of charge estimating unit 4 which, if a capacity difference before and after charging when a battery B is charged from a state in which a point of intersection d1 of an open circuit voltage OCV and a state of charge SOC of the battery B is on the SOC-OCV curve for discharging, or a capacity difference before and after discharging when the battery B is discharged from a state in which a point of intersection c1 of the open circuit voltage OCV and the state of charge SOC of the battery B is on the SOC-OCV curve for charging is less than a threshold Cth, refers to the internal ratio information to obtain an internal ratio corresponding to the capacity difference, and estimates the state of charge of the battery B using the obtained internal ratio, the open circuit voltage of the battery B when a prescribed length of time T2 has elapsed after the completion of charging or discharging, the SOC-OCV curve for charging and the SOC-OCV curve for discharging.
Inventors:
OTAGIRI TOSHIO (JP)
SATO HIROTO (JP)
NISHIGAKI KENJI (JP)
SATO HIROTO (JP)
NISHIGAKI KENJI (JP)
Application Number:
PCT/JP2018/004767
Publication Date:
August 30, 2018
Filing Date:
February 13, 2018
Export Citation:
Assignee:
TOYOTA JIDOSHOKKI KK (JP)
International Classes:
G01R31/36; H01M10/42; H01M10/48; H02J7/00
Domestic Patent References:
| WO2014132491A1 | 2014-09-04 |
Foreign References:
| JP2013213808A | 2013-10-17 | |||
| JP2012024737A | 2012-02-09 | |||
| US20150276885A1 | 2015-10-01 | |||
| US9500713B1 | 2016-11-22 |
Attorney, Agent or Firm:
OSUGA, Yoshiyuki (JP)
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