Yokogawa Electric Corporation

Tomomi Akutsu

Tetsuo Yano

Nobuhiro Tomosada

Makoto Kawano

Souichirou Torai

Daisuke Yamazaki

Atsufumi Kimura

In one embodiment, there is provided a fuel cell evaluator for evaluating a characteristic of a fuel cell based on a frequency characteristic of impedance of the fuel cell. The evaluator includes: an impedance acquisition unit configured to acquire impedances of the fuel cell for a certain current value in a Tafel region by changing a measurement frequency; an extraction unit configured to extract a reaction resistance from the acquired impedances; a calculator configured to calculate the product of the reaction resistance and the certain current value; and an indicator configured to indicate the product calculated by the calculator as the frequency characteristic of the impedance of the fuel cell.

Fuel cell evaluator and fuel cell evaluation method

A method for determining response characteristics of a battery includes: pressurizing the battery in a direction to reduce a distance between electrode surfaces of the battery; and applying a voltage or a current to the pressurized battery to determine response characteristics of the battery.

Method for determining response characteristics of battery

An electrode evaluation apparatus for evaluating a characteristic of an electrode based on an electrochemical property includes a potential control unit, an impedance acquiring unit, a current value acquiring unit, and a normalized impedance calculation unit. The potential control unit is configured to control a potential applied to an electrode. The impedance acquiring unit is configured to acquire an impedance characteristic of the electrode under a specific DC operating condition provided by the potential control unit. The current value acquiring unit is configured to acquire a temporal change in direct current value under the specific DC operating condition. The normalized impedance calculation unit is configured to apply the temporal change in direct current value acquired by the current value acquiring unit to calculate a normalized impedance where impedance acquired by the impedance acquiring unit is multiplied by the direct current value.

Electrode evaluation apparatus and electrode evaluation method

There is provided a secondary battery tester for testing a state of a secondary battery based on an impedance characteristic of the secondary battery. The tester includes: an impedance acquiring section configured to acquire an impedance value of the secondary battery; and a determining section configured to determine a state of a solid electrolyte interface (SEI) layer of the secondary battery based on the impedance value acquired by the impedance acquiring section.

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Tokyo, Japan

Tomomi Akutsu