Title:
BATTERY MANAGEMENT DEVICE, BATTERY MANAGEMENT SYSTEM AND BATTERY MANAGEMENT METHOD
Document Type and Number:
Japanese Patent JP2021144886
Kind Code:
A
Abstract:
To improve the estimation accuracy of battery deterioration.SOLUTION: A battery management device includes: an open-circuit voltage acquisition unit for acquiring an open-circuit voltage of a battery; a current acquisition unit for acquiring a current value; a battery remaining amount acquisition unit for acquiring a remaining battery level based on information indicating the relation between the open-circuit voltage and the battery remaining amount; a battery remaining amount difference calculation unit for calculating a difference between the battery remaining amount at the start of charging and the battery remaining amount at the end of charging; an integrated current value calculation unit for calculating an integrated current value from the start of charging to the end of charging; a full charging capacity calculation unit for calculating a full charging capacity based on the difference in the remaining battery amount and the integrated current value; and a deterioration degree index estimation unit for estimating a deterioration degree index which is a ratio of a present full charge capacity to the full charge capacity at an initial stage of use. The deterioration degree index estimation unit estimates the deterioration degree index based on a measured value of the deterioration degree index calculated as the ratio of the present full charge capacity to the full charge capacity at the initial stage of use, an estimated value of the deterioration degree index for past charging, and a correction value which changes according to the difference of the battery remaining amount in each charging.SELECTED DRAWING: Figure 2
Inventors:
AONO KUNIO
YAMASHITA TOMOMI
YAMAGUCHI YOSHIHIKO
YAMASHITA TOMOMI
YAMAGUCHI YOSHIHIKO
Application Number:
JP2020043704A
Publication Date:
September 24, 2021
Filing Date:
March 13, 2020
Export Citation:
Assignee:
OMRON TATEISI ELECTRONICS CO
International Classes:
G01R31/367; H01M10/48; G01R31/392; H01M10/42; H02J7/00
Attorney, Agent or Firm:
Hidewa Patent Office