CN219017712U

CN219017712U - Plate type solid oxide fuel cell stack assembly and device

Info

Publication number: CN219017712U
Application number: CN202223406251.9U
Authority: CN
Inventors: 官万兵; 刘武; 王建新; 杨钧
Original assignee: Zhejiang Hydrogen Technology Co ltd
Current assignee: Zhejiang Hydrogen Technology Co ltd
Priority date: 2022-12-20
Filing date: 2022-12-20
Publication date: 2023-05-12
Anticipated expiration: 2032-12-20

Abstract

The utility model provides a plate-type solid oxide fuel cell stack assembly, which comprises a connecting piece, a sealing piece and a single cell, wherein the connecting piece, the sealing piece and the single cell are sequentially laminated from top to bottom, the connecting piece comprises a connecting layer, and elastic conductive layers are fixedly arranged on the upper surface and the lower surface of the connecting layer.

Description

Plate type solid oxide fuel cell stack assembly and device

Technical Field

The utility model relates to the technical field of solid oxide fuel cell stacks, in particular to a plate-type solid oxide fuel cell stack assembly and a device.

Background

The internal structure of the plate-type solid oxide fuel cell stack commonly used in the market at present takes a connector, a sealing element and a single cell as a unit body, and the sealing element is clamped between the connector and the single cell and is of a rectangular annular structure and is mainly used for preventing gas leakage. During high-temperature discharge, electron collection (current collection) between the connector and the single cells is completed through strip-shaped bosses on the connector at the middle part, and grooves between the bosses are used for gas transmission. In practical application, a buffer layer is coated on the surface of the battery contacting with the connector, the buffer layer has certain compressibility, the contact area between the connector and the battery is greatly increased under the action of the buffer layer, and the current collecting effect is also greatly enhanced.

Therefore, in the original plate type cell stack structure, the thickness of the buffer layer and the compressible height of the buffer layer must be preset, and then the original thickness of the sealing material and the thickness of the sealing layer after sintering at high temperature must be set again. Only if the thicknesses of both the buffer layer and the sealing material are matched, both good current collection and good sealing are achieved.

However, the accuracy of the matching of the above-mentioned structure in practical applications is difficult to achieve, and mainly, the buffer layer is basically hardened at high temperature, the thickness that can be coordinated is very limited, and at the same time, the surface flatness of the unit cells is not completely uniform, and there is a difference in the matching thickness between each stack unit. For mass production of the cell stacks, only proper parameters can be selected for operation, so that the performance of the finished cell stacks is reduced due to poor contact or the finished cell stacks are cracked and failed due to interface air leakage.

Disclosure of Invention

The utility model aims to provide a plate type solid oxide fuel cell stack assembly, which achieves good current collection and good sealing effect by improving the structure of a connecting piece.

The aim of the utility model is realized by the following technical scheme: the plate-type solid oxide fuel cell stack assembly comprises a connecting piece, a sealing piece and a single cell which are sequentially stacked from top to bottom, wherein the connecting piece comprises a connecting layer, and elastic conductive layers are fixedly arranged on the upper surface and the lower surface of the connecting layer.

According to the utility model, through improving the connecting layer, the elastic conductive layers are added on the surfaces of the two sides of the connecting layer which are contacted with the surface of the battery, so that the high-temperature battery has compressibility and conductivity, the contact effect can be improved, the electron collection can be realized, and the current collecting effect is greatly enhanced.

Preferably, the elastic conductive layer is arranged in a wave shape, and peaks of the elastic conductive layer positioned at two sides of the connecting layer are vertically symmetrical. The wave-shaped elastic conductive layer can still keep the inherent shape at high temperature, so that the plasticity of the wave-shaped elastic conductive layer is greatly improved compared with normal temperature, the deformation stress value is greatly reduced, and the compressibility of the wave-shaped elastic conductive layer is improved to a certain extent.

Preferably, the elastic conductive layer is made of metal. The metal contains electrons which can move freely, the free electrons do irregular movement in the metal, if an external electric field is applied to the free electrons, the free electrons do directional movement, and the directional movement of the electrons can form current, so that the metal is conductive, and therefore, the metal has good conductivity.

Preferably, the elastic conductive layer has a plurality of pores on the surface. The plurality of voids can provide adjustability to the gas delivery channel, and porosity and contact properties can be optimized to a perfect state by adjusting the thickness, curvature, density, etc. of the compressible material.

Preferably, the surfaces of the two elastic conductive layers far away from the connecting layer are fixedly provided with protective coatings.

Preferably, the material of the protective coating is selected from La _0.8 Sr _0.2 MnO ₃ 、(La,Sr)(Co,Fe)O ₃ One of MCO. Pair 0 of the above materials ₂ Has high catalytic performance, good stability and good compatibility with electrolyte.

Another object of the present utility model is to provide a plate-type solid oxide fuel cell stack device, which includes a plate-type solid oxide fuel cell stack assembly, and a sealing member is fixedly disposed between two plate-type solid oxide fuel cell stack assemblies.

The tolerance range of the current collecting seal matching between the cathode and the anode of the cell stack is increased after the elastic sheet is introduced, the trouble caused by the uneven flatness of the single cell is overcome, the current collecting effect of the cell stack is enhanced while the good sealing is realized, and meanwhile, the accuracy required by the sealing and current collecting thickness matching is greatly reduced due to the introduction of compressible substances, so that the preparation difficulty of the plate-type solid oxide fuel cell stack is reduced, and the performance level of the plate-type solid oxide fuel cell stack device is greatly improved.

Drawings

FIG. 1 is a schematic view of a plate-type solid oxide fuel cell stack assembly of the present utility model;

fig. 2 is a schematic structural view of a plate-type solid oxide fuel cell stack device according to the present utility model.

Reference numerals illustrate:

1. a connecting piece; 2. a seal; 3. a single cell; 11. a connection layer; 12. an elastic conductive layer.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the description of the present utility model, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "left", "right", "front", "rear", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

As shown in fig. 1, a plate-type solid oxide fuel cell stack assembly comprises a connecting piece 1, a sealing piece 2 and a single cell 3 which are sequentially stacked from top to bottom, wherein the connecting piece 1 comprises a connecting layer 11, and elastic conductive layers 12 are fixedly arranged on the upper surface and the lower surface of the connecting layer 11.

In this embodiment, the elastic conductive layer 12 is in a wavy shape, the peaks of the elastic conductive layer 12 located at two sides of the connection layer 11 are vertically symmetrical, the wavy elastic conductive layer 12 can still maintain its inherent shape at high temperature, so that its plasticity is greatly improved compared with normal temperature, the deformation stress value is greatly reduced, the compressibility of the elastic conductive layer 12 is improved to a certain extent, the material of the elastic conductive layer 12 is metal, the surface of the elastic conductive layer 12 has a plurality of pores, the metal contains electrons capable of freely moving, the free electrons do irregular movement in the metal, if an external electric field is applied to the metal, the free electrons move directionally, the electron directional movement forms a current, thus the metal is conductive, the metal has good conductivity, and the plurality of pores can enable the gas conveying channel to have adjustability, and the porosity and the contact property can be optimized to a perfect state by adjusting the thickness, curvature, density and the like of compressible substances.

In other embodiments, the resilient conductive layer 12 may also be spring-like.

In this embodiment, the surfaces of the two elastic conductive layers 12 far from the connection layer 11 are fixedly provided with a protective coating, and the material of the protective coating is selected from La _0.8 Sr _0.2 MnO ₃ 、(La,Sr)(Co,Fe)O ₃ One of MCO, the above-mentioned material is 0 to ₂ Has very good reduction effectHigh catalytic performance, good stability and good compatibility with electrolyte.

As shown in fig. 2, this embodiment further provides a plate-type solid oxide fuel cell stack device, which includes a plate-type solid oxide fuel cell stack assembly, and a sealing member 2 is fixedly disposed between two plate-type solid oxide fuel cell stack assemblies, and the tolerance range of current collecting seal matching between the cathode and anode of the cell stack after the elastic sheet is introduced is increased, so that the trouble caused by non-uniformity of the flatness of the single cell is compensated, and the current collecting effect is enhanced while the cell stack is well sealed.

Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.

Claims

1. The plate-type solid oxide fuel cell stack assembly is characterized by comprising a connecting piece (1), a sealing piece (2) and a single cell (3) which are sequentially stacked from top to bottom, wherein the connecting piece (1) comprises a connecting layer (11), and elastic conductive layers (12) are fixedly arranged on the upper surface and the lower surface of the connecting layer (11).

2. The plate-type solid oxide fuel cell stack assembly according to claim 1, wherein the elastic conductive layers (12) are arranged in a wave shape, and peaks of the elastic conductive layers (12) positioned at both sides of the connection layer (11) are vertically symmetrical.

3. A plate-type solid oxide fuel cell stack assembly according to claim 1, characterized in that the material of the elastic conductive layer (12) is metal.

4. The plate-type solid oxide fuel cell stack assembly of claim 1, wherein the elastic conductive layer (12) has a plurality of pores on a surface thereof.

5. Plate-type solid oxide fuel cell stack assembly according to claim 1, characterized in that the surfaces of the two elastic conductive layers (12) remote from the connection layer (11) are fixedly provided with a protective coating.

6. The plate-type solid oxide fuel cell stack assembly of claim 5, wherein the material of the protective coating is selected from La _0.8 Sr _0.2 MnO ₃ 、(La,Sr)(Co,Fe)O ₃ One of MCO.

7. A plate-type solid oxide fuel cell stack device, characterized by comprising a plate-type solid oxide fuel cell stack assembly according to any one of claims 1-6, and a sealing member (2) being fixedly arranged between two of the plate-type solid oxide fuel cell stack assemblies.