Patent ID: 9099705
Filing Date: 2015-08-04
Classification: H01M,Y02E

Abstract:
1. A fuel cell system comprising: a fuel cell; a secondary cell that receives and stores surplus electric power by which output electric power of the fuel cell is greater than demanded electric power which is demanded of the fuel cell system if the output electric power of the fuel cell is greater than the demanded electric power which is demanded of the fuel cell system, and that compensates for shortfall by which the output electric power of the fuel cell is less than the demanded electric power demanded of the fuel cell system if the output electric power of the fuel cell is less than the demanded electric power demanded of the fuel cell system; a voltage measurement portion that measures voltage of the fuel cell; a current measurement portion that measures electric current of the fuel cell; and a control portion that performs a control such that the voltage of the fuel cell does not become greater than or equal to a pre-set high-potential avoidance voltage, wherein the control portion is programmed to determine whether a current-voltage characteristic for the fuel cell has declined to a level that is lower by at least a predetermined amount than an early-period level of the current-voltage characteristic occurring during an early period and the control portion is to execute at least one of (i) an operation of re-setting the high-potential avoidance voltage to a value that is smaller than an early-period set value and (ii) an operation of re-setting a remaining charge target value that is a lower-limit of amount of charge held by the second cell to a value that is larger than a set value used during the early period, if the current-voltage characteristic of the fuel cell declines to a level that is lower by at least the pre-determined amount than a level of the current-voltage characteristic of the fuel cell which occurs during an early period.