Title:
二次電池の充電率推定方法、充電率推定装置及び充電率推定プログラム
Document Type and Number:
Japanese Patent JP6649814
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To solve the problem of a conventional charging rate estimation method in which an error in charge rate estimation value due to memory effect increases.SOLUTION: A charging rate estimation method includes: calculating, based on a charge/discharge current measurement value and a temperature measurement value, a model voltage value indicative of an amplitude of voltage variation component of a secondary battery caused by factors other than electromotive voltage; calculating an electromotive voltage estimation value which is estimation value of the electromotive voltage of the secondary battery by subtracting the model voltage value from a battery voltage measurement value; calculating a charge rate estimation value indicative of an estimated charge rate of the secondary battery based on the charge/discharge current measurement value, the temperature measurement value and the battery voltage measurement value; calculating a correction value based on a difference between an initial charge/discharge curve indicative of the relation between an initial charge rate estimation value of the secondary battery calculated before start of use and initial electromotive voltage estimation value, and a current charge/discharge curve indicative of the relation between a charge rate estimation value calculated during a prescribed period after the start of use and the electromotive voltage estimation value; and correcting the charge rate estimation value based on the correction value.SELECTED DRAWING: Figure 2
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Inventors:
Takashi Akamine
Application Number:
JP2016045880A
Publication Date:
February 19, 2020
Filing Date:
March 09, 2016
Export Citation:
Assignee:
Prime Earth ev Energy Co., Ltd.
International Classes:
G01R31/388; G01R31/367; H01M10/42; H01M10/48; H02J7/00
Domestic Patent References:
| JP10246760A | ||||
| JP2011095209A | ||||
| JP2000221249A | ||||
| JP2000295775A |
Foreign References:
| US20060022643 |
Attorney, Agent or Firm:
Ken Ieiri