Title:
BATTERY UNIT
Document Type and Number:
Japanese Patent JP2023120834
Kind Code:
A
Abstract:
To provide a battery unit capable of estimating a SOC of battery cells with improved accuracy, while suppressing increase in cost.SOLUTION: A battery unit includes: a module 110 including m cell groups 118 each formed by connecting in series n cells 111 in parallel; m voltage detectors 141; (m×(n-1)) heat flow detectors 120; a storage; and a state estimator. The storage stores a table map of OCV vs. SOC characteristics (A1) and a table map of HF vs. SOC characteristics (A2). For each of the m cell groups, the state estimator is configured to: determine, based on the (A2), a true SOC of (n-1) cells that corresponds to a heat flow detected; determine, based on the (A1), an OCV of the (n-1) cells that corresponds to the determined true SOC; calculate an OCV of a remaining cell from the determined OCV and a detected composite voltage; and determine, based on the (A1), a true SOC of the remaining cell that corresponds to the calculated OCV.SELECTED DRAWING: Figure 5
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Inventors:
CHIBA KAZUKI
ARIGA TOSHIYUKI
ARIGA TOSHIYUKI
Application Number:
JP2022023918A
Publication Date:
August 30, 2023
Filing Date:
February 18, 2022
Export Citation:
Assignee:
HONDA MOTOR CO LTD
International Classes:
G01R31/367; G01R31/3835; G01R31/396; H01M10/48; H02J7/00
Attorney, Agent or Firm:
Masayuki Shobayashi
Kazuyoshi Hayashi
Hiroaki Hoshino
Kazuyoshi Hayashi
Hiroaki Hoshino
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