Patent ID: 9548506
Date: 2017-01-17
CPC Classifications: G01R,H01M,Y02E

Claim:
1. 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 comprising: 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; an indicator configured to indicate the product calculated by the calculator as the frequency characteristic of the impedance of the fuel cell; and a storage configured to store the product of the reaction resistance and the certain current value, wherein the extraction unit is configured to extract the reaction resistance by removing DC resistance components not involved in the reaction resistance from the impedances, wherein the extraction unit is configured to remove the DC resistance components by using model fitting, the model fitting extracting the reaction resistance as a reaction arc, wherein the calculator is configured to determine a state of the fuel cell by comparing products of reaction resistance and certain current value for respective current densities in two different Tafel regions.