# US 2026/0062818 A1 · Differential pressure electrolysis cell and differential pressure electrolysis stack > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0062818 A1 - Document ID: US20260062818A1 - Status: Published application - Kind: A1 - Application number: 19/303,651 - Filed: 2025-08-19 - Published: 2026-03-05 - Earliest claimed: 2024-08-27 - Assignees: Honda Motor Co., Ltd. - Applicants: Honda Motor Co., Ltd. - Inventors: Satoshi SUGAI - Web page: https://patentgrep.com/patent/US20260062818A1 ## CPC - C25B 9/05: Pressure cells - C25B 9/23: comprising ion-exchange membranes in or on which electrode material is embedded - C25B 9/60: Constructional parts of cells - C25B 9/70: Assemblies comprising two or more cells - C25B 9/77: having diaphragms - C25B 1/04: by electrolysis of water - 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) ## Abstract A differential pressure electrolysis cell includes a membrane electrode assembly, a first separator, a second separator, a first current collector, a second current collector, and a pressing member. The pressing member includes a sheet portion that is formed of a polymer material having an electrical insulating property so as to be elastically deformable, and is disposed between the second current collector and the second separator in a state of being compressed and deformed in a stacking direction of the membrane electrode assembly. ## Claims ### Claim 1 A differential pressure electrolysis cell comprising: a membrane electrode assembly including an electrolyte membrane, a first electrode catalyst layer stacked on one surface of the electrolyte membrane, and a second electrode catalyst layer stacked on another surface of the electrolyte membrane; a first separator located across the electrolyte membrane from the second electrode catalyst layer; a second separator located across the electrolyte membrane from the first electrode catalyst layer; a first current collector disposed between the first separator and the first electrode catalyst layer; a second current collector disposed between the second separator and the second electrode catalyst layer; and a pressing member sandwiched and held between the second current collector and the second separator and configured to press the second current collector toward the second electrode catalyst layer; wherein the differential pressure electrolysis cell applies a voltage between the first current collector and the second current collector to electrolyze a fluid supplied to the membrane electrode assembly and thereby generate a gas in the second electrode catalyst layer, and is configured to cause the gas to have a higher pressure than a pressure of the fluid, and the pressing member includes a sheet portion that is formed of a polymer material having an electrical insulating property so as to be elastically deformable, and is disposed between the second current collector and the second separator in a state of being compressed and deformed in a stacking direction of the membrane electrode assembly. ### Claim 2 (depends on 1) The differential pressure electrolysis cell according to claim 1, wherein the pressing member includes a metal plate provided inside the sheet portion. ### Claim 3 (depends on 1) The differential pressure electrolysis cell according to claim 1, wherein the pressing member includes a metal plate extending in a planar direction of the membrane electrode assembly, and the sheet portion covers the metal plate from both sides in the stacking direction. ### Claim 4 (depends on 1) The differential pressure electrolysis cell according to claim 1, further comprising a sealing portion having an annular shape and being formed of a polymer material having an electrical insulating property so as to be elastically deformable and being configured to seal a gap between the second separator and an outer peripheral portion of the membrane electrode assembly protruding outward in a planar direction from the second current collector, wherein the sealing portion is formed integrally with the sheet portion. ### Claim 5 (depends on 4) The differential pressure electrolysis cell according to claim 4, wherein a reinforcing portion made of metal is provided inside the sealing portion. ### Claim 6 (depends on 5) The differential pressure electrolysis cell according to claim 5, wherein the reinforcing portion extends annularly along the sealing portion. ### Claim 7 (depends on 5) The differential pressure electrolysis cell according to claim 5, wherein the pressing member includes a metal plate provided inside the sealing portion, and the reinforcing portion is connected to the metal plate. ### Claim 8 (depends on 4) The differential pressure electrolysis cell according to claim 4, further comprising a pressure resistant member having an annular shape and covering the sealing portion from outside in the planar direction, wherein the pressure resistant member is in contact with the sealing portion. ### Claim 9 (depends on 4) The differential pressure electrolysis cell according to claim 4, wherein the sealing portion is in contact with or close to the second current collector. ### Claim 10 (depends on 1) A differential pressure electrolysis stack comprising a stack of a plurality of differential pressure electrolysis cells, wherein each of the plurality of differential pressure electrolysis cells is the differential pressure electrolysis cell according to claim 1.