# US 2024/0200215 A1 · Water electrolysis apparatus

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- Number: US 2024/0200215 A1
- Document ID: US20240200215A1
- Status: Published application
- Kind: A1
- Application number: 18/484,936
- Filed: 2023-10-11
- Published: 2024-06-20
- Earliest claimed: 2022-12-20
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Toshiaki KUSAKARI
- Web page: https://patentgrep.com/patent/US20240200215A1

## CPC

- C25B 15/08: Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B 1/04: by electrolysis of water
- C25B 9/73: of the filter-press type
- C25B 9/77: having diaphragms
- C25B 15/029: Concentration
- Y02E 60/36: Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
- C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A water electrolysis apparatus for obtaining hydrogen by electrolyzing water with a water electrolysis cell includes a water electrolysis stack having a plurality of water electrolysis cells, a water supply side path which is a path for supplying water to the water electrolysis stack, and a hydrogen side path through which hydrogen generated in the water electrolysis stack flows, and a gas-liquid separator for gas-liquid separation of a fluid containing oxygen and water discharged from the water electrolysis stack is provided in the water supply side path, and a dilution gas mixer for mixing a dilution gas between the water electrolysis stack and the gas-liquid separator is provided.

## Claims

### Claim 1

A water electrolysis apparatus that obtains hydrogen by water electrolysis using a water electrolysis cell, the water electrolysis apparatus comprising:
a water electrolysis stack including a plurality of the water electrolysis cells;
a water supply side path that is a path through which water is supplied to the water electrolysis stack; and
a hydrogen side path through which hydrogen generated in the water electrolysis stack flows, wherein:
the water supply side path is provided with a gas-liquid separator that separates gas and liquid of a fluid containing oxygen and water discharged from the water electrolysis stack; and
a dilution gas mixer that mixes a dilution gas between the water electrolysis stack and the gas-liquid separator is provided.

### Claim 2 (depends on 1)

The water electrolysis apparatus according to claim 1, wherein:
a hydrogen concentration meter is provided in a flow path through which gas separated by the gas-liquid separator is discharged from the gas-liquid separator;
the water electrolysis apparatus includes a controller that controls an operation of the water electrolysis apparatus; and
the controller is configured to mix the dilution gas from the dilution gas mixer when a value obtained using the hydrogen concentration meter exceeds a predetermined threshold value.

### Claim 3 (depends on 1)

The water electrolysis apparatus according to claim 1, wherein the dilution gas is air.