SECONDARY BATTERY MODULE REMAINING LIFE DIAGNOSIS METHOD AND REMAINING LIFE DIAGNOSIS SYSTEM

Title:

SECONDARY BATTERY MODULE REMAINING LIFE DIAGNOSIS METHOD AND REMAINING LIFE DIAGNOSIS SYSTEM

Document Type and Number:

WIPO Patent Application WO/2020/152901

Kind Code:

A1

Abstract:

This secondary battery module remaining life diagnosis method includes steps of: acquiring charging information including the current, voltage, and state of charge of a secondary battery module; obtaining the current capacitance and internal resistance of the secondary battery module from the charging information, calculating a degree of degradation of the secondary battery module by comparing the obtained capacitance and internal resistance with the initial values of the capacitance and internal resistance, and setting this degree of degradation as a measured value; acquiring output information of the secondary battery module; calculating, using the output information, a predicted value of the degree of degradation by a prediction formula; comparing the measured value with the predicted value; and calculating remaining life when the difference between the measured value and the predicted value is less than or equal to a predetermined value. When the difference between the measured value and the predicted value exceeds the predetermined value, the secondary battery module remaining life diagnosis method corrects the prediction formula on the basis of the measured value and calculates a predicted value using the corrected prediction formula. This makes it possible to accurately determine the degree of degradation of the secondary battery module in a short time and estimate remaining life in accordance with a usage history.

Inventors:

YAMAUCHI SHUKO (JP)
INOUE TAKESHI (JP)
YAMAZOE TAKANORI (JP)
MAKINO SHIGEKI (JP)
KOMATSU DAIKI (JP)
IMAI SHINJI (JP)

Application Number:

PCT/JP2019/034137

Publication Date:

July 30, 2020

Filing Date:

August 30, 2019

Export Citation:

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Assignee:

HITACHI LTD (JP)

International Classes:

H01M10/48; G01R31/392; H02J7/00

Foreign References:

JP2018179733A	2018-11-15
JP2013118757A	2013-06-13
JP5466564B2	2014-04-09
JP5338591B2	2013-11-13

Other References: