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Document Type and Number:
Japanese Patent JP6642795
Kind Code:
PROBLEM TO BE SOLVED: To provide a battery state estimation device with which it is possible to accurately estimate the replacement time of a performance degraded battery irrespective of the cause of degradation.SOLUTION: In a BCIA 9, a measurement unit 92 measures the voltage V, current I, and temperature T of a battery 5. A lowest voltage detection unit 98 detects a lowest voltage Vst from the time series of battery voltages V measured by the measurement unit 92 during the cranking of an engine. In a CPU 8, a cumulative use unit 88 calculates the cumulative use in years of the battery 5. A replacement criterion threshold determination unit 89 determines a replacement criterion threshold Vst_th on the basis of the lowest voltage Vst and a use period. The replacement criterion threshold Vst_th is higher in correspondence to an increase in the use period of the battery. A replacement time determination unit 90 determines that the battery be replaced when the lowest voltage Vst falls below the replacement criterion threshold Vst_th.SELECTED DRAWING: Figure 21

Daisuke Hosaka
Takafumi Kondo
Yu Udagawa
Tetsuya Matsumoto
Comb Arihiro
Application Number:
Publication Date:
February 12, 2020
Filing Date:
January 19, 2016
Export Citation:
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Hitachi Chemical Co., Ltd.
International Classes:
G01R31/392; H01M10/42; H01M10/48; H02J7/00
Domestic Patent References:
Foreign References:
Attorney, Agent or Firm:
Kiyotaka Sakamoto
Sanji Tanabe

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