Fuel cell i.e. proton exchange membrane hydrogen fuel cell, diagnosing method for electric vehicle, involves applying electrical stress whose slew rate of stress is lower than or equal to specific value, to terminals of assembly of cell

摘要

The method involves applying electrical stress to terminals of an electrode-membrane assembly of a diagnosed fuel cell, where slew rate of the electrical stress is lower than or equal to 1500 millivolt per second. Electrical response of the electrode-membrane assembly is measured by measuring voltage in an open circuit at the terminals of the assembly or by measuring intensity in a closed circuit at the terminals of the assembly. The assembly is completely discharged before applying the stress to the terminals of the assembly. An independent claim is also included for a device for diagnosing a fuel cell.