CN-122025693-A - Center symmetry type SOFC branch flow passage structure and solid oxide fuel cell

CN122025693ACN 122025693 ACN122025693 ACN 122025693ACN-122025693-A

Abstract

The invention belongs to the technical field related to fuel cells, and discloses a central symmetry SOFC branch flow passage structure and a solid oxide fuel cell, wherein the SOFC branch flow passage structure comprises a connector and gas flow passage arrays arranged on the surface of the connector, and the four gas flow passage arrays are symmetrically distributed on the connector in a central manner by taking the geometric center of the connector as a symmetry center; the gas flow passage array is isosceles triangle, and a plurality of trapezoid gas flow passages with the same structure are distributed at intervals along the central line of the bottom side of the isosceles triangle to form the gas flow passage array. The invention adopts the design of combining the central symmetrical layout of the four partitions and the branch structure, thereby realizing the optimization of the performance of multiple physical fields. The overall configuration of the central symmetry of the four sections can enhance the geometric suitability of the flow field, and gas flows fully in each section after entering from the inlet, so that the shortage of local centralized gas supply or gas supply is relieved, and the uniformity of the overall fluid distribution is improved.

Inventors

HU RUN
HU JINGJIN

Assignees

华中科技大学

Dates

Publication Date: 20260512
Application Date: 20260319

Claims (8)

1. A central symmetry formula SOFC branch flow channel structure, its characterized in that: The branch flow passage structure comprises a connector and gas flow passage arrays arranged on the surface of the connector, wherein the four gas flow passage arrays are symmetrically distributed on the connector in a central mode by taking the geometric center of the connector as a symmetrical center, the gas flow passage arrays are isosceles triangles, and a plurality of trapezoid gas flow passages with the same structure are distributed at intervals along the central line of the bottom side of the isosceles triangle to form the gas flow passage arrays.
2. The SOFC branching flow channel structure according to claim 1, wherein the connector is rectangular, and the connector is divided into four isosceles triangle areas by the diagonal of the rectangle, each isosceles triangle area forms an independent flow field area, and each flow channel area is provided with the gas flow channel array.
3. The branching flow channel structure of a center-symmetrical SOFC according to claim 2, wherein each of the four corners of the connector is provided with an independent flow channel.
4. The SOFC branching flow channel structure according to claim 2, wherein the gas flow channel is a branching structure, which is substantially trapezoidal and comprises an inlet main flow channel, a primary main flow channel, a secondary branching flow channel and an outlet main flow channel which are communicated, wherein the primary main flow channel is obliquely arranged.
5. The branching flow channel structure of a center-symmetrical SOFC according to claim 4, wherein the gas flow channels are arranged in mirror symmetry about a centerline of an isosceles triangle.
6. The SOFC branching flow passage structure according to claim 4, wherein the inlet flow passage and the outlet flow passage are respectively positioned at two sides of a center line of the isosceles triangle and are perpendicular to the bottom side of the isosceles triangle, the two secondary branching flow passages are arranged in parallel with each other and are arranged along a direction perpendicular to the center line of the isosceles triangle, one end of one primary branching flow passage is connected with one end of the inlet flow passage, the other end of the primary branching flow passage is connected with one end of the two secondary branching flow passages, the other end of the two secondary branching flow passages is connected with one end of the other primary branching flow passage, the other end of the other primary branching flow passage is connected with the outlet flow passage, and the primary branching flow passages are arranged along a direction parallel to a diagonal line.
7. The branching flow channel structure of a central symmetry SOFC according to any one of claims 1-6, wherein the branching flow channel structure is a bionic tree flow channel structure.
8. A solid oxide fuel cell is characterized in that a cathode connector and an anode connector of the cell are both of the central symmetry SOFC branch flow channel structure as claimed in any one of claims 1 to 7.

Description

Center symmetry type SOFC branch flow passage structure and solid oxide fuel cell Technical Field The invention belongs to the technical field related to fuel cells, and particularly relates to a central symmetry type SOFC (solid oxide Fuel cell) branch flow passage structure and a solid oxide fuel cell. Background The Solid Oxide Fuel Cell (SOFC) is used as a high-efficiency clean energy conversion device, has the advantages of environmental protection, high energy conversion efficiency and the like, is one of the most applicable potential technologies in the field of fuel cells at present, has tight coupling of fluid flow, electrochemical reaction, heat transfer and structural mechanical deformation in the operation process, ensures the uniformity of distribution of each physical field, is the core for guaranteeing the performance of the cell, and can cause the blocking of the transmission of reaction gas due to uneven flow field, so that the local difference of the electrochemical reaction is caused, and further causes uneven heat generation and temperature gradient, and the mismatch of the thermal expansion Coefficient (CTE) of materials of each functional layer is caused, so that the thermal stress is generated, thereby causing microcrack and expansion of brittle ceramic parts, damaging structural integrity, weakening interlayer interface bonding strength and even causing sealing failure. Therefore, constructing a reasonable flow field layout becomes an effective way to promote the uniformity of the distribution of each physical field. However, the geometric suitability of the existing flow channel structure is weak, the uniform distribution and complete coverage of the whole domain of the reaction gas are difficult to realize, the problems of local flow dead zone, uneven gas distribution and insufficient supply are easy to occur, the reaction efficiency and the output performance are reduced, the fuel utilization rate is low, and the improvement of the overall efficiency and the operation stability of the battery is restricted. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides a central symmetry type SOFC (solid oxide Fuel cell) branch flow passage structure and a solid oxide fuel cell, which aim to solve the problem that the flow passage structure of the existing solid oxide fuel cell is difficult to realize uniform distribution of multiple physical fields. In order to achieve the above object, according to one aspect of the present invention, there is provided a branching flow channel structure of a central symmetry SOFC, the branching flow channel structure including a connector and a gas flow channel array disposed on a surface of the connector, four gas flow channel arrays being symmetrically distributed on the connector with a geometric center of the connector as a symmetry center, the gas flow channel array being in an isosceles triangle shape, and a plurality of trapezoid gas flow channels having the same structure being arranged at intervals along a center line of a bottom side of the isosceles triangle to form the gas flow channel array. Further, the connecting body is rectangular, the connecting body is divided into four isosceles triangle areas through diagonal lines of the rectangle, each isosceles triangle area forms an independent flow field area, and each flow channel area is provided with one gas flow channel array. Further, the four corners of the connector are respectively provided with an independent runner. Further, the gas flow passage adopts a branch structure which is basically trapezoid and comprises an inlet main flow passage, a primary main flow passage, a secondary branch flow passage and an outlet main flow passage which are communicated, wherein the primary main flow passage is obliquely arranged. Further, the gas flow channels are arranged in mirror symmetry with respect to the midline of the isosceles triangle. The inlet flow channel and the outlet flow channel are respectively positioned at two sides of the isosceles triangle central line and are perpendicular to the bottom edge of the isosceles triangle, the two secondary branch flow channels are mutually parallel and are arranged along the direction perpendicular to the isosceles triangle central line, one end of one primary main flow channel is connected with one end of the inlet flow channel, the other end of the primary main flow channel is connected with one end of the two secondary branch flow channels, the other ends of the two secondary branch flow channels are connected with one end of the other primary main flow channel, the other end of the other primary main flow channel is connected with the outlet flow channel, and the primary main flow channels are arranged along the direction parallel to the diagonal. Further, the branch flow channel structure is a bionic tree-shaped flow channel structure. The invention also provides a solid oxide fuel cell,