Diaphragm for alkaline water electrolysis, method for producing same, and alkaline water electrolysis tank

The diaphragm for alkaline water electrolysis with a frame-shaped bulk portion addresses the issue of local bending by enhancing rigidity, preventing deformation and maintaining cell integrity during thermal expansion.

WO2026028789A1PCT designated stage Publication Date: 2026-02-05KAWASAKI JUKOGYO KK
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Patent Information

Application Number
PCT/JP2025/025185
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-08-02
Filing Date
2025-07-14
Publication Date
2026-02-05

AI Technical Summary

Technical Problem

Conventional alkaline water electrolytic cells with a zero-gap structure experience local bending and potential rupture of the diaphragm due to thermal expansion during operation, as the diaphragm is constrained only at the seal region and unconstrained regions deform, leading to concentrated deformation.

Method used

A diaphragm for alkaline water electrolysis with a porous polymer membrane featuring a frame-shaped bulk portion that spans the seal, unconstrained, and inter-electrode regions, providing increased rigidity to prevent deformation during thermal expansion.

Benefits of technology

The diaphragm design suppresses local bending and deformation, maintaining the integrity of the electrolytic cell by ensuring the unconstrained region remains rigid and less prone to thermal expansion, thus preventing rupture.

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Abstract

This diaphragm for alkaline water electrolysis separates an anode chamber in which an anode of an alkaline water electrolysis tank is disposed and a cathode chamber in which a cathode is disposed, the diaphragm for alkaline water electrolysis comprising a polymer porous membrane integrally having a seal region, which is sandwiched by a tank-constituting member in the alkaline water electrolysis tank, and a separator region, which is disposed on the inner-peripheral side of the seal region. The separator region has an inter-electrode region that is smaller than the separator region and is sandwiched between the anode and the cathode, and a non-restraint region present between the seal region and the inter-electrode region. The polymer porous membrane has a frame-shaped bulk part that extends across the seal region, the non-restraint region, and the inter-electrode region.
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Citation Information

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