(19)
(11) EP 2 903 069 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
21.10.2015 Bulletin 2015/43

(43) Date of publication:
05.08.2015 Bulletin 2015/32

(21) Application number: 15157428.2

(22) Date of filing: 07.03.2008
(51) International Patent Classification (IPC): 
H01M 8/04(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

(30) Priority: 26.04.2007 JP 2007117228

(62) Application number of the earlier application in accordance with Art. 76 EPC:
08719244.9 / 2156496

(71) Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Toyota-shi, Aichi-ken, 471-8571 (JP)

(72) Inventors:
  • Kumei, Hideyuki
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • Kato, Manabu
    Toyota-shi, Aichi-ken, 471-8571 (JP)

(74) Representative: Kuhnen & Wacker 
Patent- und Rechtsanwaltsbüro Prinz-Ludwig-Straße 40A
85354 Freising
85354 Freising (DE)

 
Remarks:
This application was filed on 03-03-2015 as a divisional application to the application mentioned under INID code 62.
 


(54) Fuel cell system


(57) The IR resistance of each unit cell 2 is measured (step S14), and a highest unit cell voltage as a threshold voltage is set based on the IR resistance and the load current (step S18). The setting of the highest unit cell voltage uses map data that approximates current-voltage characteristics of a unit cell when the fuel gas is insufficiently supplied. In that case, the highest unit cell voltage is determined based on the voltage with respect to the load current obtained from the map data, and the IR loss calculated from the IR resistance and the load current. This highest unit cell voltage is compared with the measured unit cell voltage (step S22). If the unit cell voltage is below the highest unit cell voltage, the power generation of the fuel cell is stopped or restrained (step S24).