Solid oxide fuel cell and stack

By using a combined structure of annular buffer seal and a porous ceramic press ring in a solid oxide fuel cell, the thermal stress problem caused by thermal cycles is solved, and the stable airtight isolation of the battery cell under thermal cycles is achieved, and the heat resistance and sealing of the battery are enhanced.

CN119852436APending Publication Date: 2025-04-18北京质子动力发电技术有限公司 +3
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Patent Information

Application Number
CN202510023278.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-07
Publication Date
2025-04-18

AI Technical Summary

Technical Problem

During the thermal cycle, existing solid oxide fuel cells have thermal stress due to inconsistent thermal expansion coefficient between the battery and the connecting plate, which may cause rupture of the electrolyte membrane. The traditional sealing method lacks a stress release mechanism, which can easily lead to warping or damage to the battery.

Method used

Using a combined structure of an annular buffer seal and a porous ceramic press ring, the annular buffer seal forms a gap between the battery cell and the battery metal support ring, and is closed by a porous ceramic press ring, providing a thermal expansion space and adapting to deformation caused by thermal cycles.

Benefits of technology

The stable airtight isolation of the battery cell opposite to the two sides under thermal cycles is achieved, which avoids electrolyte membrane rupture and battery warping, and enhances the battery's heat resistance and sealing.

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Abstract

The invention discloses a solid oxide fuel cell unit and a cell stack, and the cell unit comprises a first connecting plate, a second connecting plate and a cell metal support ring connected between the first connecting plate and the second connecting plate. A concave pressing ring bearing groove and a battery bearing through groove formed in the pressing ring bearing groove are formed in one side, close to the first connecting plate, of the battery metal supporting ring; a battery piece is arranged in the battery bearing through groove, and a gap is formed between the periphery of the battery piece and the inner side wall of the battery bearing through groove; an opening of the gap is covered with an annular buffering sealing piece, the outer edge part of the annular buffering sealing piece is attached to the surface of the groove bottom of the pressing ring bearing groove, and the inner edge part of the annular buffering sealing piece is attached to the surface of the side, close to the first connecting plate, of the battery piece. A porous ceramic pressing ring is pressed between the first connecting plate and the annular buffering sealing piece in an abutting mode, so that the annular buffering sealing piece seals an opening of the gap.
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