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Title:
SECONDARY BATTERY SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/142550
Kind Code:
A1
Abstract:
The present invention highly accurately estimates the state of charge of a secondary battery, from among a plurality of secondary batteries composing a secondary battery system, that is not provided with a means for measuring or estimating temperature. This secondary battery system comprises a plurality of secondary batteries connected in series, a current detection unit, a voltage detection unit, a storage unit having a database including data for the initial state-of-charge and battery-capacity values of the secondary batteries, a temperature detection unit for measuring or estimating the temperature of at least one first secondary battery from among the plurality of secondary batteries, and a control unit. The control unit calculates the state of charge of the first secondary battery from the temperature of the first secondary battery acquired from the temperature detection unit and an internal resistance calculated from a current acquired by the current detection unit and the voltage of the first secondary battery acquired by the voltage detection unit, and uses the data for the initial state-of-charge and battery-capacity values of a second secondary battery, from among the plurality of secondary batteries, in which the temperature is not measured or estimated and the state of charge of the first secondary battery to calculate the state of charge of the second secondary battery.

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Inventors:
SHIN SEOGCHUL (JP)
HONKURA KOHEI (JP)
SUZUKI SHUICHI (JP)
Application Number:
PCT/JP2018/045603
Publication Date:
July 25, 2019
Filing Date:
December 12, 2018
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
G01R31/36; H01M10/44; H01M10/48; H02J7/00
Domestic Patent References:
WO2014115294A12014-07-31
Foreign References:
JP2005331482A2005-12-02
JP2017009540A2017-01-12
JP2016514255A2016-05-19
JP2007010664A2007-01-18
JP2008532050A2008-08-14
US20150276881A12015-10-01
US20140316728A12014-10-23
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
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