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Pub. No.:    WO/2017/179347    International Application No.:    PCT/JP2017/009581
Publication Date: Fri Oct 20 01:59:59 CEST 2017 International Filing Date: Fri Mar 10 00:59:59 CET 2017
IPC: H01M 10/48
G01R 31/36
H02J 7/00
Applicants: HITACHI, LTD.
Inventors: HONKURA, Kohei
本蔵 耕平
This secondary battery system comprises: a retaining unit for retaining an internal resistance first reference value in a first state-of-charge that is lower than a predetermined state-of-charge, and an internal resistance second reference value in a second state-of-charge that is higher than the first state-of-charge, in the initial state of the secondary battery; a measurement unit for measuring, in an in-use state of the secondary battery, a first internal resistance of the secondary battery in the first state-of-charge, and a second internal resistance of the secondary battery in the second state-of-charge; and a detection unit detecting a deterioration of the secondary battery on the basis of a comparison between the first reference value and the first internal resistance in the first state-of-charge measured by the measurement unit, and a comparison between the second reference value and the second internal resistance in the second state-of-charge measured by the measurement unit.