Abstract: A battery state diagnosing device applies load to a battery from a load applying section, measures input and output characteristics of the battery, and diagnoses a state of the battery by plugging a result of measurement into a mathematical expression obtained by a system identification method. In the battery state diagnosing device, a current load is used as the load applying section. With this arrangement, the battery state diagnosing device is capable of suitably determining, for example, life and state-of-charge of the battery.
Type:
Grant
Filed:
August 28, 2003
Date of Patent:
May 8, 2007
Assignee:
ESPEC Corporation
Inventors:
Yoshitsugu Kato, Hirohito Funato, Alexandru Forrai
Abstract: A migration measuring method based on an alternating current impedance method, including steps: direct current with fine alternating current superposed is applied across electrodes (1), (2) to measure the impedance there between; and a surface static capacity (c) is calculated from the measured value of impedance in order to measure migration in accordance with the variation of the calculated surface static capacity.
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