(19)
(11) EP 4 234 766 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.09.2023 Bulletin 2023/39

(43) Date of publication A2:
30.08.2023 Bulletin 2023/35

(21) Application number: 23178603.9

(22) Date of filing: 02.02.2022
(51) International Patent Classification (IPC): 
C25B 1/04(2021.01)
C25B 15/023(2021.01)
C25B 15/00(2006.01)
 C25B 9/70(2021.01)
C25B 1/50(2021.01)
C25B 15/02(2021.01)
(52) Cooperative Patent Classification (CPC):
C25B 1/04; C25B 9/70; C25B 15/023; C25B 1/50; C25B 15/00; C25B 15/02
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30) Priority: 17.02.2021 JP 2021023663

(62) Application number of the earlier application in accordance with Art. 76 EPC:
22154792.0 / 4047112

(71) Applicant: Hitachi, Ltd.
Tokyo 100-8280 (JP)

(72) Inventors:
  • WATANABE, Keiji
    Tokyo, 100-8280 (JP)
  • FURUTA, Futoshi
    Tokyo, 100-8280 (JP)
  • ISHIKAWA, Takao
    Tokyo, 100-8280 (JP)

(74) Representative: Strehl Schübel-Hopf & Partner 
Maximilianstrasse 54
80538 München
80538 München (DE)

   


(54) HYDROGEN PRODUCTION SYSTEM AND HYDROGEN PRODUCTION METHOD


(57) In a control system for a hydrogen production system that produces hydrogen using a plurality of water electrolysis stacks, a technique is provided, which is capable of effectively restraining a degradation of the water electrolysis stacks. In the control system according to the present disclosure, any one of an operation priority stack, a stop priority stack, and an intermediate operation stack is allocated as the operation states of the water electrolysis stacks.







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