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Title:
CELL STATE ESTIMATION DEVICE, CELL CONTROL DEVICE, CELL SYSTEM, AND CELL STATE ESTIMATION METHOD
Document Type and Number:
WIPO Patent Application WO/2017/130673
Kind Code:
A1
Abstract:
To improve the precision of calculating the state of charge of a cell. A cell management device according to the present invention is characterized by being provided with: a SOCv computation unit for calculating a state of charge by using the voltage between both ends of a cell; a SOCi computation unit for calculating a state of charge by integrating the current flowing to the cell; a SOCw computation unit for weighting and adding the state of charge of the cell as calculated by the SOCv computation unit and the state of charge of the cell as calculated by the SOCi computation unit; and a SOCi eccentric time computation unit for calculating a SOCi eccentric time on the basis of one or a plurality of elements from among the completion of the preceding system operation of the cell, the time elapsed from the completion of charging/discharging during the preceding system operation until the initiation of a current system startup, the temperature of the cell, the state of health of the cell, and the polarization voltage of the cell, the SOCw computation unit increasing the weighting of the state of charge of the cell as calculated by the SOCi computation unit while the time elapsed from the initiation of the current system startup is the SOCi eccentric time.

Inventors:
NAKAMURA YOHEI (JP)
OHKAWA KEIICHIRO (JP)
Application Number:
PCT/JP2017/000371
Publication Date:
August 03, 2017
Filing Date:
January 10, 2017
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
G01R31/36; H01M10/48; H02J7/00
Domestic Patent References:
WO2013031559A12013-03-07
WO2016158396A12016-10-06
WO2017056732A12017-04-06
Foreign References:
JP2014044074A2014-03-13
JP2005315730A2005-11-10
JP2006038495A2006-02-09
JP2007178215A2007-07-12
JP2015040764A2015-03-02
JP2008145349A2008-06-26
Other References:
See also references of EP 3410137A4
Attorney, Agent or Firm:
TODA Yuji (JP)
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