CN211295267U

CN211295267U - Bipolar plate for fuel cell

Info

Publication number: CN211295267U
Application number: CN201922456909.9U
Authority: CN
Inventors: 徐一凡; 唐厚闻; 梁鹏
Original assignee: Shanghai H Rise New Energy Technology Co Ltd
Current assignee: Shanghai H Rise New Energy Technology Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-08-18
Anticipated expiration: 2029-12-30

Abstract

The utility model relates to a bipolar plate for a fuel cell, which comprises a plate core module, a peripheral module and a plurality of connecting modules, wherein the plate core module is provided with a flow field unit, the peripheral module is of a frame structure, and the plate core module is arranged inside the frame structure through the connecting modules; the outer edge of the plate core module, the inner edge of the peripheral module and the connecting module form a plurality of hollow structures, and part of the hollow structures are gas channels or liquid channels of the fuel cell; the connection module comprises a first connection part and a second connection part, the first connection part is connected with the outer edge of the core module, the second connection part is connected with the inner edge of the peripheral module, and the first connection part and the second connection part are detachably connected with each other. Compared with the prior art, the utility model discloses can realize the flexibility and the insulating nature requirement of fuel cell pile design, promote product application scope, reduce and modify manufacturing cost, the later stage of being convenient for changes and maintains.

Description

Bipolar plate for fuel cell

Technical Field

The utility model belongs to the technical field of fuel cell technique and specifically relates to a bipolar plate for fuel cell is related to.

Background

The proton exchange membrane fuel cell is an electrochemical device which decomposes anode hydrogen into protons and electrons through a catalyst, the protons reach a cathode through a proton exchange membrane, the electrons reach the cathode through an external circuit, and the electrons, the protons and oxygen generate water under the catalysis of a cathode catalyst.

The proton exchange membrane fuel cell can structurally be divided into an active part which reacts to release energy and a reactive part which does not react to release energy. The reactive part comprises structures such as fluid distribution, sealing and the like, and is an essential component for realizing the function of the active part.

The bipolar plate of the existing proton exchange membrane fuel cell generally adopts a way of a whole polar plate, and an active part and a reactive part are simultaneously contained on the whole polar plate. This structure has the following problems: 1. the whole bipolar plate not only meets the corrosion-resistant and conductive requirements of the active part, but also meets the sealing and insulating functional requirements of the reactive part, and the requirements of the whole process are improved. 2. The production mode of a whole polar plate can not realize the flexible collocation of different flow field designs and distribution seal structure designs under various application scenes. 3. The bipolar plate is in direct contact with the shell, so that electric leakage is easy to occur, and potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a bipolar plate for a fuel cell, which overcomes the above-mentioned drawbacks of the prior art.

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

a bipolar plate for a fuel cell comprises a plate core module, a peripheral module and a plurality of connecting modules, wherein a flow field unit is arranged on the plate core module, the peripheral module is of a frame structure, and the plate core module is arranged in the frame structure through the connecting modules; the outer edge of the plate core module, the inner edge of the peripheral module and the connecting module form a plurality of hollow structures, and part of the hollow structures are gas channels or liquid channels of the fuel cell; the connecting module comprises a first connecting part and a second connecting part, the first connecting part is connected with the outer edge of the core module, the second connecting part is connected with the inner edge of the peripheral module, and the first connecting part and the second connecting part are detachably connected with each other.

Furthermore, the end of the first connecting part is provided with a convex block or a groove, the end of the second connecting part is provided with a groove or a convex block corresponding to the first connecting part, and the groove and the convex block are mutually embedded to form connection.

Furthermore, the embedding part of the bump and the groove is coated with sealing glue.

Further, the lug and the groove are connected in an interference fit mode.

Furthermore, the peripheral module is provided with a stack sealing structure, and when the bipolar plates and the membrane electrode in the fuel cell are stacked at intervals, the stack sealing structures on the adjacent bipolar plates are connected with each other to form an integral seal.

Furthermore, the peripheral module adopts an engineering plastic plate or a rubber plate.

Furthermore, the peripheral module is provided with a positioning pin mounting hole.

Furthermore, the plate core module adopts an integrally formed metal plate or graphite composite plate.

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

1. the utility model integrates the active area (flow field unit) in the bipolar plate on the plate core module and the idle area on the peripheral module, and then combines the plate core module and the peripheral module through the connecting module to form a novel design structure; the same flow field can be used for fuel cell stacks with different power levels only by designing different peripheral modules for the fuel cell stacks with different models and matching the same plate core module; the plate core module can be replaced in a fuel cell stack of one model to realize different flow field designs; effectively improves the applicable power range of the bipolar plate and realizes the design flexibility of the galvanic pile.

2. The board core module and the peripheral module can be made of different materials respectively, so that the corrosion resistance and the electric conduction requirements of the reaction area can be improved, the sealing and insulating functional requirements of the reactive part can be improved, the manufacturing process difficulty and cost are reduced, and later-period change and maintenance are facilitated.

3. The connection module enables the plate core module and the peripheral module to form hollow structures therebetween, the hollow structures at the two ends naturally form a gas channel or a liquid channel of the fuel cell, and the hollow structures at the two sides can effectively isolate the plate core module from the outside, so that the electric leakage protection effect is better achieved.

4. The peripheral module is provided with a galvanic pile sealing structure, when the bipolar plates and the membrane electrode in the fuel cell are stacked at intervals, a closed whole is formed between the bipolar plates, and the best insulating and sealing effect is achieved.

5. The peripheral module is provided with a positioning pin mounting hole, which is convenient for the installation and positioning of the bipolar plate in the fuel cell shell.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The structure of the attached drawings is as follows: 1. the board core module, 2, peripheral module, 21, locating pin mounting hole, 3, connection module, 31, first connecting portion, 32, second connecting portion, 4, hollow out construction.

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.

As shown in fig. 1, the present embodiment provides a bipolar plate for a fuel cell, including a core block 1, a peripheral block 2, and a plurality of connection blocks 3. The peripheral module 2 is a frame structure, and the board core module 1 is installed inside the frame structure through a plurality of connecting modules 3. The plate core module 1 is provided with a flow field unit which is an element used for the reaction work of the fuel cell pile.

The outer edge of the board core module 1, the inner edge of the peripheral module 2 and the connecting module 3 form a plurality of hollow structures 4. The hollow structures 4 at the left and right ends of the plate core module 1 are gas channels or liquid channels of the fuel cell. The hollow structures 4 positioned at the upper side and the lower side of the board core module 1 form the isolation layers of the board core module 1 and the peripheral module 2, so that the board core module 1 can be effectively isolated from the outside, and the electric leakage protection effect can be better realized.

Each connection module 3 includes a first connection portion 31 and a second connection portion 32. The first coupling portion 31 is coupled to an outer edge of the panel core module 1, the second coupling portion 32 is coupled to an inner edge of the peripheral module 2, and the first coupling portion 31 and the second coupling portion 32 are detachably coupled to each other. In this embodiment, there are three types of connection modules 3, each indicated by A, B, C. In the B-type connection module 3, a bump is provided on the end of the first connection portion 31, a groove is provided on the end of the second connection portion 32, the bump on the first connection portion 31 and the groove on the second connection portion 32 are embedded into each other to form a connection, and a sealing compound is coated on the embedded portion. In the a-type connection module 3, the protrusion on the end of the first connection portion 31 is T-shaped and is connected with the groove on the second connection portion 32 in an interference fit manner, so that the connection is easier to detach, maintain or replace. In the C-shaped connection module 3, the projection on the end of the first connection portion 31 and the groove on the second connection portion 32 are L-shaped and are mutually embedded; the C-shaped connection module 3 is located at the corner of the board core module 1, and can improve the connection strength of the first connection portion 31 and the second connection portion 32.

The peripheral module 2 is provided with a galvanic pile sealing structure, when the bipolar plates and the membrane electrodes in the fuel cell are stacked at intervals, the galvanic pile sealing structures on the adjacent bipolar plates are connected with each other to form an integral seal. The galvanic pile sealing structure adopts a traditional sealing structure, including but not limited to a glue dispensing/injecting area and a mounting glue line sealing groove. The outermost sealing structure is continuous, the core plate modules are completely isolated, and the insulating performance is excellent. The peripheral module 2 is also provided with a positioning pin mounting hole 21, which is convenient for the installation and positioning of the bipolar plate in the fuel cell shell.

The peripheral module 2 can be made of engineering plastic plates or rubber plates, and can be integrally formed on the plate core module 1 through direct injection molding in a manufacturing process or can be assembled with the plate core module 1 through off-line processing.

The core module 1 may be made of rolled and pressed metal material, or may be made of molded and machined graphite composite material, and in this embodiment, the metal plate is made of metal material.

In the embodiment, the active area in the bipolar plate is integrated on the plate core module 1, the reactive area is integrated on the peripheral module 2, and then the plate core module 1 and the peripheral module 2 are combined through the connecting module 3 to form a novel design structure.

When in use, the same flow field can be used for fuel cell stacks with different power levels only by designing different peripheral modules 2 for the fuel cell stacks with different models and matching the same plate core module 1; the plate core module 1 can be replaced in a fuel cell stack of one model to realize different flow field designs; effectively improves the applicable power range of the bipolar plate and realizes the design flexibility of the galvanic pile.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A bipolar plate for a fuel cell is characterized by comprising a plate core module (1), a peripheral module (2) and a plurality of connecting modules (3), wherein a flow field unit is arranged on the plate core module (1), the peripheral module (2) is of a frame structure, and the plate core module (1) is arranged in the frame structure through the connecting modules (3); the outer edge of the plate core module (1), the inner edge of the peripheral module (2) and the connecting module (3) form a plurality of hollow structures (4), and part of the hollow structures (4) are gas channels or liquid channels of the fuel cell; the connection module (3) comprises a first connection part (31) and a second connection part (32), the first connection part (31) is connected with the outer edge of the core module (1), the second connection part (32) is connected with the inner edge of the peripheral module (2), and the first connection part (31) and the second connection part (32) are detachably connected with each other.

2. A bipolar plate for a fuel cell as set forth in claim 1, wherein the first connection portion (31) is provided at an end thereof with a projection or a groove, the second connection portion (32) is provided at an end thereof with a groove or a projection corresponding to the first connection portion (31), and the groove and the projection are fitted to each other to form a connection.

3. The bipolar plate for a fuel cell as claimed in claim 2, wherein the engagement between the projections and the recesses is coated with a sealant.

4. A bipolar plate for a fuel cell as claimed in claim 2, wherein the projections and the grooves are connected by interference fit.

5. A bipolar plate for a fuel cell according to claim 1, wherein the peripheral module (2) is provided with stack sealing structures, and when the bipolar plate and the membrane electrode in the fuel cell are alternately stacked, the stack sealing structures on the adjacent bipolar plates are connected with each other to form an integral seal.

6. A bipolar plate for a fuel cell as claimed in claim 1, wherein the peripheral module (2) is made of an engineering plastic plate or a rubber plate.

7. A bipolar plate for a fuel cell as claimed in claim 1, wherein the peripheral module (2) is provided with dowel mounting holes (21).

8. A bipolar plate for a fuel cell as claimed in claim 1, wherein the core module (1) is an integrally formed metal plate or graphite composite plate.