CN215118956U

CN215118956U - Bipolar plate sealing surface leveling structure, bipolar plate and fuel cell

Info

Publication number: CN215118956U
Application number: CN202120252562.0U
Authority: CN
Inventors: 陈汇豪; 胡正坤; 甘全全; 戴威
Original assignee: Shanghai Shenli Technology Co Ltd
Current assignee: Shanghai Shenli Technology Co Ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-12-10
Anticipated expiration: 2031-01-29

Abstract

The utility model relates to a sealed face flattening structure of bipolar plate and fuel cell, wherein the flattening structure include with the flattening board of the sealed groove looks adaptation of bipolar plate and locate the tie coat between flattening board and the seal groove. Compared with the prior art, the utility model discloses bond the flattening board in the seal groove to the smooth surface that makes the flattening board or special seal structure's surface replaces the rough surface of seal groove, as the extrusion seal face between bipolar plate and the sealing member, or the phase change changes sealed interface material, and then avoids leading to sealed inefficacy because of rough surface's channel structure or interface material problem.

Description

Bipolar plate sealing surface leveling structure, bipolar plate and fuel cell

Technical Field

The utility model belongs to the technical field of fuel cell, a sealed face flattening structure of bipolar plate and fuel cell who contains this structure is related to.

Background

The fuel cell is a clean and efficient energy utilization mode, and the development of the fuel cell has important significance for improving the environment and implementing sustainable energy development. A fuel cell generally requires a plurality of single cells to be connected in series to form a stack, each single cell is composed of a positive electrode and a negative electrode (i.e., a fuel electrode and a positive electrode (i.e., an oxidant electrode)) and an electrolyte, and the main components are a bipolar plate and a proton exchange membrane, wherein the airtightness of the bipolar plate directly determines the performance, the service life and the safety and reliability of the fuel cell stack. The traditional sealing between the bipolar plate and the proton exchange membrane is usually compressed, attached and sealed by adopting a rubber elastomer sealing element, the sealing performance and the surface roughness of the bipolar plate are closely related, for example, the surfaces of a molded flexible graphite plate and a machined graphite plate are relatively rough to the surface of a frame of the proton exchange membrane, so that the improvement of the smoothness of a sealing groove of the bipolar plate has important significance for the sealing performance and the service life.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a sealed face flattening structure of bipolar plate for solve graphite bipolar plate because of the higher relatively poor problem of sealing performance when leading to extrusion seal of seal groove roughness.

The purpose of the utility model can be realized through the following technical scheme:

a flattening structure for the sealing surface of a bipolar plate comprises a flattening plate matched with a sealing groove of the bipolar plate and a bonding layer arranged between the flattening plate and the sealing groove.

Furthermore, a smooth outer plate surface is arranged on the leveling plate.

Further, the material of the screed plate includes polyimide, polyethylene terephthalate, epoxy resin, and the like.

Further, the thickness of the leveling plate is 0.01-0.1 mm.

Further, the material of the bonding layer comprises epoxy glue, acrylic glue or rubber. Wherein the rubber comprises a chloroprene rubber adhesive, a nitrile rubber adhesive or a butyl silicone rubber adhesive.

Further, the thickness of the bonding layer is 0.01-0.1 mm.

A bipolar plate is provided with a fuel gas inlet, an oxidant gas inlet, a coolant inlet, a fuel gas outlet, an oxidant gas outlet, a coolant outlet, and a sealing groove;

the sealing grooves are continuously distributed around the fuel gas inlet, the oxidant gas inlet, the coolant inlet, the fuel gas outlet, the oxidant gas outlet and the coolant outlet;

the leveling structure is arranged in the sealing groove.

A fuel cell comprises a plurality of bipolar plates, a membrane electrode arranged between the adjacent bipolar plates, and a sealing element arranged between the membrane electrode and the bipolar plates;

the sealing element is clamped between the membrane electrode and the leveling plate in a sealing manner.

Compared with the prior art, the utility model has the characteristics of it is following:

1) the utility model bonds the leveling plate in the sealing groove, so that the smooth outer surface of the leveling plate replaces the rough surface of the sealing groove to be used as an extrusion sealing surface between the bipolar plate and the sealing element, and the sealing interface material is changed in phase, thereby avoiding sealing failure caused by the channel structure of the rough surface or the interface material problem;

2) the structural strength of the sealing groove can be improved through the leveling plate and the bonding layer, so that the design stress of the sealing element is increased, and the sealing performance is improved;

2) the bonding layer is favorable for strengthening the structural strength of weak regions of the bipolar plate such as a gap bridge region and the like, and the service life of the bipolar plate is prolonged.

Drawings

FIG. 1 is a schematic view of a bipolar plate having a flattened configuration for the sealing surface of the bipolar plate according to an exemplary embodiment;

FIG. 2 is a schematic diagram showing a partial structure of a fuel cell including a bipolar plate sealing surface flattening structure according to an embodiment;

the notation in the figure is:

1-bipolar plate, 2-leveling plate, 3-bonding layer, 4-sealing groove, 5-sealing element and 6-membrane electrode.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example (b):

a fuel cell as shown in fig. 1, comprising a plurality of bipolar plates 1, a membrane electrode 6 disposed between adjacent bipolar plates 1, and a sealing member 5 disposed between the membrane electrode 6 and the bipolar plates 1;

as shown in fig. 2, the bipolar plate 1 is provided with a fuel gas inlet, an oxidant gas inlet, a coolant inlet, a fuel gas outlet, an oxidant gas outlet, a coolant outlet, and a seal groove 4; the sealing grooves 4 are continuously distributed around the fuel gas inlet, the oxidant gas inlet, the coolant inlet, the fuel gas outlet, the oxidant gas outlet and the coolant outlet;

a bipolar plate sealing surface leveling structure is arranged in the sealing groove 4, and comprises a leveling plate 2 matched with the bipolar plate sealing groove and a bonding layer 3 arranged between the leveling plate 2 and the sealing groove 4. Wherein the leveling plate 2 is a polyimide plate with a thickness of 0.05mm, and the bonding layer 3 is formed by epoxy glue with a thickness of 0.05mm coated in the sealing groove 4. The sealing member 5 is sealingly clamped between the membrane electrode 6 and the leveling plate 2.

In the embodiment, the leveling plate 2 is bonded in the sealing groove 4, so that the smooth outer surface of the leveling plate 2 or the outer surface of a special sealing structure replaces the rough surface of the sealing groove to be used as an extrusion sealing surface between the bipolar plate and the sealing element, or a sealing interface material is changed in a phase-changing manner, and sealing failure caused by the problem of a channel structure or an interface material of the rough surface is avoided; in addition, this example still is favorable to strengthening the structural strength in bipolar plate weak areas such as gap bridge region through the tie coat, is favorable to improving bipolar plate's life when guaranteeing sealing performance.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.

Claims

1. The utility model provides a sealed face flattening structure of bipolar plate which characterized in that, this flattening structure includes flattening board (2) with bipolar plate seal groove (4) looks adaptation and locates tie coat (3) between flattening board (2) and seal groove (4).

2. A bipolar plate sealing surface flattening structure according to claim 1, characterized in that the flattening plate (2) is provided with a smooth outer plate surface.

3. The bipolar plate sealing surface flattening structure of claim 1, wherein the flattening plate (2) comprises one of a polyimide flattening plate, a polyethylene terephthalate flattening plate, or an epoxy resin flattening plate.

4. A bipolar plate sealing surface flattening structure according to claim 1, wherein the flattening plate (2) has a thickness of 0.01-0.1 mm.

5. The bipolar plate sealing face flattening structure of claim 1, wherein the bonding layer (3) comprises one of an epoxy adhesive bonding layer, an acrylic adhesive bonding layer or a rubber bonding layer.

6. A bipolar plate sealing face flattening structure according to claim 1, wherein the thickness of the adhesive layer (3) is 0.01-0.1 mm.

7. A bipolar plate, provided with a sealing groove (4) on the bipolar plate (1), characterized in that the sealing groove (4) is provided with a flattening structure according to any one of claims 1 to 6 therein.

8. A bipolar plate according to claim 7, wherein the bipolar plate (1) is further provided with a fuel gas inlet, an oxidant gas inlet, a coolant inlet, a fuel gas outlet, an oxidant gas outlet and a coolant outlet;

the sealing grooves (4) are continuously distributed around the fuel gas inlet, the oxidant gas inlet, the coolant inlet, the fuel gas outlet, the oxidant gas outlet and the coolant outlet.

9. A fuel cell comprising a plurality of bipolar plates according to claim 7 or 8.

10. A fuel cell according to claim 9, further comprising a membrane electrode (6) disposed between adjacent bipolar plates (1), and a seal (5) disposed between the membrane electrode (6) and the bipolar plates (1);

the sealing element (5) is clamped between the membrane electrode (6) and the leveling plate (2) in a sealing manner.