Title:
SECONDARY BATTERY SYSTEM
Document Type and Number:
Japanese Patent JP2018205139
Kind Code:
A
Abstract:
To provide a secondary battery system with which it is possible to estimate the degradation index of a secondary battery with high accuracy and over a wide area.SOLUTION: A differential curve V-dQ/dV that indicates the relation of the voltage V of a battery pack 4 with a differential value dQ/dV that is the ratio of a change amount dQ of capacity Q of the battery pack 4 to a change amount dV of the voltage V is calculated, and a prescribed feature point is specified on this differential curve V-dQ/dV. The SOH of the battery pack 4 is estimated from the specified feature point on the basis of correlation between a previously stored feature point and an SOH. As feature points having a high correlation with SOH on the differential curve V-dQ/dV, a feature point P1 is fixed in a first degradation region of up to SOH 100-75% and a feature point P2 is fixed in a second degradation region of SOH 75% or less. A degradation region that includes the present SOH of the battery pack 4 is selected, and the feature points P1, P2 corresponding to this degradation region are applied to the process of SOH estimation.SELECTED DRAWING: Figure 5
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Inventors:
INOUE MASAHIRO
ENDO EIJI
MATSUO KAZUKI
UMETANI TATSUHIKO
TODA NORITAKA
MOCHIZUKI SHUN
ENDO EIJI
MATSUO KAZUKI
UMETANI TATSUHIKO
TODA NORITAKA
MOCHIZUKI SHUN
Application Number:
JP2017111093A
Publication Date:
December 27, 2018
Filing Date:
June 05, 2017
Export Citation:
Assignee:
MITSUBISHI MOTORS CORP
MITSUBISHI AUTO ENG
MITSUBISHI AUTO ENG
International Classes:
G01R31/36; H01M10/48; H02J7/00
Attorney, Agent or Firm:
Shiro Aihara