CN110752387A

CN110752387A - Single cell of proton exchange membrane fuel cell and manufacturing method of electric pile thereof

Info

Publication number: CN110752387A
Application number: CN201911044169.6A
Authority: CN
Inventors: 张义煌; 蒋利娟; 刘敏; 陆濛洲; 陈杰; 李刚
Original assignee: Wuxi Weifu High Technology Group Co Ltd
Current assignee: Wuxi Weifu High Technology Group Co Ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-02-04
Anticipated expiration: 2039-10-30
Also published as: CN110752387B

Abstract

The invention belongs to the technical field of fuel cells, and particularly relates to a single cell of a proton exchange membrane fuel cell and a manufacturing method of a galvanic pile of the single cell. The invention comprises the following steps: (1) preparing a flow passage isolation plate; (2) applying liquid adhesive on the peripheries of the anode gas diffusion layer, the cathode gas diffusion layer and the catalyst coating film, bonding the anode gas diffusion layer, the cathode gas diffusion layer and the catalyst coating film together, and sealing and packaging to form the MEA without the reinforced frame; (3) attaching the packaged MEA without the reinforced frame to one side of the flow channel isolation plate, and sealing and packaging to form a single cell; (4) attaching a sealing gasket or a sealing ring on one side of the flow channel isolation plate without the MEA; (5) a plurality of single batteries are superposed to form a stack. The membrane-electrode-gas diffusion layer assembly is fixed on the flow channel isolation plate through the adhesive, so that the problem of dislocation of the MEA and the flow channel isolation plate in the process of stacking the fuel cell stack can be solved, the consistency of the stack is improved, the problem of long-time working cracking of the MEA protective edge in the stack is reduced, and the stable performance of the stack is ensured.

Description

Single cell of proton exchange membrane fuel cell and manufacturing method of electric pile thereof

Technical Field

The invention belongs to the technical field of fuel cells, and particularly relates to a single cell of a proton exchange membrane fuel cell and a manufacturing method of a galvanic pile of the single cell.

Background

The proton exchange membrane fuel cell is of a multilayer structure, each layer comprises a substance conveying flow channel capable of independently performing electrochemical reaction, in order to prevent leakage of reactant hydrogen, air and cooling liquid, a corresponding sealing structure is designed between layers, and the reliability of the sealing structure directly determines the service life of the fuel cell.

The fuel cell stack is formed by stacking a plurality of cells in series. When the electrodes of the battery units are connected, strict sealing is needed, hydrogen gas leakage can be caused due to poor sealing, the utilization rate of hydrogen is reduced, the efficiency of the fuel battery is influenced, and the battery can not work and the service life of the battery is influenced when the efficiency of the fuel battery is serious. The high-pressure high-power density fuel cell has the characteristic of high gas production pressure, so the requirement on gas sealing is stricter. With the development of fuel cell technology, the power of fuel cells is getting larger and larger, the number of single cells forming a fuel cell stack is getting larger and larger, the number of single cells of the current high-power stack is more than 200, some of the single cells even reach 500, with the increasing number of single cells, the requirements on the assembly and consistency of the stack are getting higher and higher, and whether the assembly consistency of the stack is good determines the performance of the stack. The well-assembled galvanic pile can exert the performance of the components to the maximum extent, and the galvanic pile with good consistency can work under high current density, thereby being beneficial to improving the power density of the galvanic pile.

A conventional cell unit is composed of a membrane-electrode-gas diffusion layer assembly (MEA) and a bipolar plate, and is sealed by a preformed (gasket) seal (a rubber gasket is mounted on the bipolar plate and press-sealed with the frame of the membrane electrode assembly), as shown in the enlarged portion of fig. 1: wherein the PEM would extend out and be bonded to the rim by an adhesive to form a membrane-electrode-gas diffusion layer assembly (MEA) with a reinforced rim. The sealing gasket is arranged on the flow passage isolation plate, and the frame is extruded by the flow passage isolation plate to form contact sealing. Because the surfaces of the two times need to be symmetrically extruded, symmetrical loads are formed, otherwise, the frame is easy to deform, and the air tightness and the power generation efficiency are further influenced. As the number of cells in a stack increases, higher demands are placed on stack assembly difficulty and consistency.

The conventional stack assembly process is usually performed in a press, and generally a membrane-electrode-gas diffusion layer assembly (MEA) with a reinforcing frame and a flow channel separator are alternately stacked with a spacing therebetween and attached with current collecting plates and end plates according to a certain assembly sequence and positioning method, and are fixed by fastening means to form a complete stack. During the assembly process, the electric pile assembly ensures the electric pile sealing performance, the electric pile sealing is realized by adding a flow passage isolation plate rubber sealing strip and an MEA (membrane electrode assembly) edge protection sealing, the sealing rings on the upper flow passage isolation plate and the lower flow passage isolation plate are required to be strictly aligned, the deviation is less than 0.01mm, the method not only controls the processing precision of parts of the fuel cell stack, such as a flow passage isolation plate, a sealing ring and a membrane-electrode-gas diffusion layer assembly (MEA) with a reinforced frame, but also puts strict requirements on the assembly precision of the stack, ensures the good contact between the membrane-electrode-gas diffusion layer assembly (MEA) with the reinforced frame and a bipolar plate interface, and prevents the gas diffusion layer from collapsing to influence the performance and the service life of the cell due to the overpressure between the membrane-electrode-gas diffusion layer assembly (MEA) with the reinforced frame and the bipolar plate. Therefore, the matching of the deformation of a galvanic pile sealing element and the deformation of a membrane-electrode-gas diffusion layer assembly (MEA) with a reinforced frame is considered in the galvanic pile design stage, the embedding depth of the bipolar plate with the galvanic pile height quantification into the membrane electrode diffusion layer is controlled, the sealing element reaches the preset deformation amount, no overpressure prevention design is adopted, the overpressure phenomenon frequently occurs in the galvanic pile assembly process due to the machining error of parts of the galvanic pile, and the quality of the galvanic pile assembly is difficult to control.

Disclosure of Invention

The present invention provides a single cell of proton exchange membrane fuel cell and a method for manufacturing a stack thereof, which aims to overcome the defects of the prior art. The membrane-electrode-gas diffusion layer assembly is fixed on the flow channel isolation plate through the adhesive, so that the problem of dislocation of the membrane-electrode-gas diffusion layer assembly (MEA) and the flow channel isolation plate in the process of stacking the fuel cell stack can be solved, the consistency of the stack is improved, the problem of long-time working cracking of the MEA protective edge in the stack is solved, and the stable performance of the stack is ensured. The MEA is combined on the flow channel isolation plate to form a single cell, so that the problems of the assembly and consistency and the sealing of the electric pile are solved.

In order to solve the technical problems, the invention adopts the technical scheme that: a method for manufacturing a single proton exchange membrane fuel cell and a stack thereof is characterized in that the method for manufacturing the single proton exchange membrane fuel cell and the stack thereof has the following characteristics:

a method for manufacturing a single cell of a proton exchange membrane fuel cell and a galvanic pile thereof comprises the following steps:

(1) taking out a flow passage isolation plate, and removing dust and grease on the flow passage isolation plate;

(2) applying liquid adhesive on the peripheries of the anode gas diffusion layer, the cathode gas diffusion layer and the catalyst coating film, and bonding the anode gas diffusion layer, the cathode gas diffusion layer and the catalyst coating film together and sealing and packaging the three to form the MEA without the reinforced frame;

(3) attaching the packaged MEA without the reinforced frame to one side of the flow channel isolation plate, and sealing and packaging to form a single cell;

(4) attaching a sealing gasket or a sealing ring on one side of the flow channel isolation plate without the MEA;

(5) and (4) overlapping the plurality of single batteries in the step (3) to form a galvanic pile.

The MEA without the reinforced frame is used for bonding the anode gas diffusion layer, the cathode gas diffusion layer and the catalyst coating film together in a screen printing, dispensing or template injection molding mode and sealing and packaging.

The MEA without the reinforced frame is attached, sealed and packaged in an active area on the side of a hydrogen flow field or an air flow field of the flow channel isolation plate in a screen printing, dispensing or template injection mode.

The MEA without the reinforced frame is attached and packaged in a screen printing, dispensing or template injection molding mode, and the liquid adhesive is coated on the outer periphery of the MEA or the outer periphery of the flow channel active area of the flow channel isolation plate.

The material of the flow channel isolation plate is one of graphite, a graphite resin composite material, a graphite metal composite material, a metal material and a metal resin composite material.

The flow channel isolation plate is attached with a sealing gasket or a sealing ring for sealing reactant fluid and cooling fluid.

The flow channel active area at one side of the flow channel isolation plate adhered with the sealing gasket or the sealing ring is higher than 0.05-0.5 mm.

The adhesive is one or more of sulfur-free normal-temperature curing silicone rubber, sulfur-free high-temperature curing silicone rubber, fluororubber, ethylene propylene diene monomer rubber, sulfur-free UV (ultraviolet) glue or epoxy resin glue.

The flow passage isolation plate is formed by attaching one partition, two partitions or a plurality of partitions, and a groove for limiting the movement of the sealing gasket or the sealing ring is arranged on the flow passage isolation plate.

Compared with the prior art, the invention has the following advantages:

(1) the membrane-electrode-gas diffusion layer assembly (MEA) is fixed on the flow channel isolation plate through an adhesive, so that the problem of dislocation of the membrane-electrode-gas diffusion layer assembly (MEA) and the flow channel isolation plate in the process of stacking the fuel cell stack can be solved, and the consistency of the stack is improved; the problem that the protective edge of the membrane-electrode-gas diffusion layer assembly (MEA) cracks in the galvanic pile after working for a long time when the membrane-electrode-gas diffusion layer assembly (MEA) is independent can be solved, and the stable performance of the galvanic pile is ensured.

(2) The membrane-electrode-gas diffusion layer assembly (MEA) is fixed on the runner partition plates through an adhesive, the seal of each single cell is sealed between the runner partition plates and the membrane electrode membrane-electrode-gas diffusion layer assembly (MEA), 1 sealing ring is reduced for each single cell, the problem that gas is easy to leak when the independent membrane-electrode-gas diffusion layer assembly (MEA) is adopted and is stacked for the second time after being disassembled is solved, and the uniformity of the stack is ensured.

(3) The fixed membrane-electrode-gas diffusion layer assembly (MEA) can be packaged on the air side or the hydrogen side, only the active area of the flow channel isolation plate is packaged, the fluid common channel part is not packaged, and consumable materials are saved.

(4) The membrane-electrode-gas diffusion layer assembly (MEA) is packaged on the flow channel isolation plate, and can be realized by screen printing, dispensing, template injection molding and other methods, so that the method is suitable for large-scale production, can be quickly assembled and stacked, and realizes large-scale production.

The technical solution of the present invention will be described in further detail by the following embodiments.

Drawings

Fig. 1 is a schematic structural diagram of a conventional pem fuel cell stack.

Fig. 2 is a schematic view of the encapsulation process of the membrane-electrode-gas diffusion layer assembly.

Fig. 3 is a schematic structural diagram of a hermetically sealed flow path separator assembly.

Fig. 4 is a schematic view of a packaging process of the unit cell.

FIG. 5 is a schematic diagram of a novel PEM fuel cell stack.

FIG. 6 is a schematic diagram of a catalyst-membrane-catalyst sandwich around the proton exchange membrane.

FIG. 7 is a schematic view of a catalyst-membrane-catalyst sandwich structure without the periphery of the PEM.

In the figure, GDL-gas diffusion layer; CCM-catalyst/proton exchange membrane module; 1-a proton exchange membrane; 2-catalyst layer.

Detailed Description

The proton exchange membrane fuel cell single cell and the manufacturing method of the electric pile thereof are carried out according to the following steps, the MEA and the flow channel isolation plate are prepared, the MEA is attached to the flow channel isolation plate, the attached sealing gasket or the sealing ring is attached to the flow channel isolation plate, the single cell is formed, a plurality of single cells are overlapped to form the electric pile, and the structure of the single cell inside the electric pile is shown in figure 5.

Example 1

(1) preparing a membrane-electrode-gas diffusion layer assembly (MEA) comprising:

a. a proton exchange membrane; forming an anode catalyst layer on one surface of the proton exchange membrane to expose a peripheral area of the surface of the proton exchange membrane; forming a cathode catalyst layer on the other surface of the proton exchange membrane and exposing the peripheral area of the surface of the proton exchange membrane; the anode catalytic layer and the cathode catalytic layer have the same area size, as shown in fig. 6.

b. An anode gas diffusion layer; the anode gas diffusion layer is combined with the anode catalyst layer and covers the peripheral area, and the area size of the anode gas diffusion layer is completely consistent with that of the proton exchange membrane;

c. a cathode gas diffusion layer; the cathode gas diffusion layer is combined with the cathode catalyst layer and covers the peripheral area, and the area size of the cathode gas diffusion layer is completely consistent with that of the proton exchange membrane;

the diffusion layer and the proton exchange membrane are sealed and packaged by an adhesive as shown in fig. 2, and the sulfur-free normal-temperature cured silicone rubber is tightly combined with the catalyst layer through a frame member made of the proton exchange membrane, an anode gas diffusion layer and a cathode gas diffusion layer; dispensing sulfur-free normal-temperature curing silicone rubber on the periphery of a gas diffusion layer through a dispenser, then adhering an anode gas diffusion layer with a catalyst layer-membrane-catalyst layer (CCM) on the periphery of a proton exchange membrane, and curing the silicone rubber at normal temperature for 24 hours to form a membrane electrode-gas diffusion layer assembly (MEA).

(2) And sealing and packaging the runner partition plate assembly, namely sealing and packaging the anode partition plate and the cooling liquid-cathode partition plate by using an adhesive, coating epoxy resin glue on the periphery of the partition plate by screen printing, fitting, sealing and heating for curing.

(3) Attaching a sealing gasket or a sealing ring on one surface of the sealed and packaged flow channel isolation plate component; the sealing ring is formed on the isolation plate in a dispensing mode, and the sealed flow channel isolation plate assembly is sealed and packaged as shown in figure 3;

(4) and (3) attaching the MEA prepared in the step (1) to the flow channel separation plate assembly to form a single battery, as shown in FIG. 4.

(5) And (4) overlapping the plurality of single batteries in the step (4) to form a galvanic pile.

In the above embodiments, the material of the flow channel isolation plate is graphite.

The flow channel isolation plate in the above embodiments is attached with a gasket or a sealing ring for sealing the reactant fluid and the cooling fluid.

In the above embodiments, the flow channel active area on one side of the flow channel isolation plate attached with the sealing ring is higher by 0.05 mm.

The adhesive in the embodiment is sulfur-free normal-temperature cured silicone rubber and epoxy resin adhesive, and the sulfur-free normal-temperature cured silicone rubber can be attached to an MEA (membrane electrode assembly) and a runner isolation plate; the epoxy resin adhesive can be attached to the MEA and the flow channel isolation plate.

In the above embodiments, the flow passage isolation plate is formed by attaching a partition, and a groove for limiting the movement of the sealing ring is formed on the flow passage isolation plate.

Example 2

a. a proton exchange membrane; forming an anode catalyst layer on one surface of the proton exchange membrane, wherein the area of the anode catalyst layer is consistent with that of the proton exchange membrane; and forming a cathode catalyst layer on the other surface of the proton exchange membrane, wherein the cathode catalyst layer is consistent with the proton exchange membrane in area size, as shown in fig. 7.

b. The anode gas diffusion layer is combined with the anode catalyst layer, and the area size of the anode gas diffusion layer is completely consistent with that of the proton exchange membrane;

c. the cathode gas diffusion layer is combined with the cathode catalyst layer, and the area size of the cathode gas diffusion layer is completely consistent with that of the proton exchange membrane;

the diffusion layer and the proton exchange membrane are sealed and packaged by an adhesive, as shown in fig. 2, the fluorine rubber is tightly combined with the catalyst layer by a frame component made of the fluorine rubber, the catalyst layer, the anode gas diffusion layer and the cathode gas diffusion layer; dispensing the fluororubber on the periphery of the gas diffusion layer through a dispenser, then attaching the anode gas diffusion layer, the catalyst layer-membrane-catalyst layer (CCM) without the periphery of the proton exchange membrane and the cathode gas diffusion layer, and heating and curing for 3 hours to form a membrane electrode-gas diffusion layer assembly (MEA).

(2) A sealed package flow channel isolation plate assembly is formed by hermetically packaging an anode isolation plate, a cathode isolation plate, the anode isolation plate and the cathode isolation plate through adhesives, coating sulfur-free high-temperature curing silicone rubber on the periphery of the isolation plate through screen printing, fitting, sealing and heating for curing for 1 hour.

(3) Attaching a sealing gasket or a sealing ring on one surface of the sealed and packaged flow channel isolation plate component; the sealing ring can form a sealing ring on the isolation plate in a dispensing manner, and the sealed flow channel isolation plate assembly is sealed and packaged as shown in fig. 3;

The flow channel isolation plate is made of a graphite resin composite material.

The flow channel isolation plate is pasted with a sealing ring for sealing reactant fluid and cooling fluid.

And the flow channel active area at one side of the flow channel isolation plate adhered with the sealing gasket or the sealing ring is higher than 0.1 mm.

The adhesive is sulfur-free high-temperature cured silicone rubber and fluororubber, and the sulfur-free normal-temperature cured silicone rubber can be attached to a runner isolation plate and an MEA (membrane electrode assembly); the fluororubber may be bonded to both the MEA and the flow path separator.

The flow passage isolation plate is formed by laminating a partition, and a groove for limiting the movement of the sealing ring is arranged on the flow passage isolation plate.

Example 3

the diffusion layer and the proton exchange membrane are sealed and packaged by an adhesive as shown in fig. 2, and the two-component normal-temperature cured silica gel is tightly combined with the catalyst layer through a frame member made of the two-component normal-temperature cured silica gel, the catalyst layer, the anode gas diffusion layer and the cathode gas diffusion layer; and gluing the sulfur-free UV glue on the periphery of the gas diffusion layer by a screen printer, then attaching the anode gas diffusion layer, the catalyst layer-membrane-catalyst layer (CCM) without the periphery of the proton exchange membrane and the cathode gas diffusion layer, and finally carrying out UV curing at normal temperature to form a membrane electrode-gas diffusion layer assembly (MEA).

2) A sealed package flow channel isolation plate assembly is formed by hermetically packaging an anode isolation plate, a cathode isolation plate, the anode isolation plate and the cathode isolation plate through adhesives, coating ethylene propylene diene monomer rubber to the periphery of the isolation plate through screen printing, fitting, sealing and heating for curing.

(3) Attaching a sealing ring on one surface of the sealed and packaged flow channel isolation plate component; the sealing ring can form a sealing ring on the isolation plate in a dispensing manner, and the sealed flow channel isolation plate assembly is sealed and packaged as shown in fig. 3;

The runner division plate is made of graphite metal composite materials.

And the flow channel active area at one side of the flow channel isolation plate pasted with the sealing ring is higher than 0.5 mm.

The adhesive is sulfur-free UV adhesive and ethylene propylene diene monomer, and the sulfur-free UV adhesive can be attached to an MEA (membrane electrode assembly) and a runner isolation plate; the ethylene propylene diene monomer rubber can be attached to an MEA (membrane electrode assembly) or a flow channel isolation plate.

The flow passage isolation plate is formed by laminating a plurality of separators, and a groove for limiting the movement of the sealing ring is arranged on the flow passage isolation plate.

Example 4

a. a proton exchange membrane; forming an anode catalyst layer on one surface of the proton exchange membrane to expose a peripheral region of the surface of the proton exchange membrane; forming a cathode catalyst layer on the other surface of the proton exchange membrane and exposing a peripheral region of the surface of the proton exchange membrane; the anode catalytic layer and the cathode catalytic layer have the same area size, as shown in fig. 6.

b. The anode gas diffusion layer is combined with the anode catalyst layer, covers the peripheral area and has the area size completely consistent with that of the proton exchange membrane;

c. the cathode gas diffusion layer is combined with the cathode catalyst layer, covers the peripheral area and has the area size completely consistent with that of the proton exchange membrane;

the diffusion layer and the proton exchange membrane are sealed and packaged by an adhesive as shown in fig. 2, and the sulfur-free normal-temperature curing silicone rubber is tightly combined with the catalyst layer through a frame member made of the proton exchange membrane, an anode gas diffusion layer and a cathode gas diffusion layer; the sulfur-free normal-temperature curing silicone rubber is dispensed at the periphery of a catalyst layer-membrane-catalyst layer (CCM) at the periphery of a proton exchange membrane through a dispenser, then an anode gas diffusion layer, the catalyst layer-membrane-catalyst layer (CCM) at the periphery of the proton exchange membrane and a cathode gas diffusion layer are attached, and the silicone rubber is cured for 24 hours to form a membrane electrode-gas diffusion layer assembly (MEA).

(2) A sealed packaging flow channel isolation plate assembly is formed by hermetically packaging an anode isolation plate and a cooling liquid-cathode isolation plate through adhesives, coating fluororubber on the periphery of the isolation plate through screen printing, fitting, sealing and heating for curing.

(4) attaching the MEA prepared in the step (1) to the flow channel separation plate assembly to form a single battery, as shown in FIG. 4;

The flow channel isolation plate is made of a metal material.

And the flow channel active area at one side of the flow channel isolation plate pasted with the sealing ring is higher than 0.3 mm.

The adhesive is sulfur-free normal-temperature cured silicone rubber and fluororubber, and the sulfur-free normal-temperature cured silicone rubber can be attached to an MEA (membrane electrode assembly) and a runner isolation plate; the fluororubber may be bonded to both the MEA and the flow path separator.

The flow passage isolation plate is formed by laminating two separators, and a groove for limiting the movement of the sealing ring is arranged on the flow passage isolation plate.

Example 5

the diffusion layer and the proton exchange membrane are sealed and packaged by an adhesive as shown in fig. 2, and the sulfur-free normal-temperature curing silicone rubber is tightly combined with the catalyst layer through a frame member made of the proton exchange membrane, an anode gas diffusion layer and a cathode gas diffusion layer; the sulfur-free normal-temperature curing silicone rubber is applied with glue at the periphery of a catalyst layer-membrane-catalyst layer (CCM) at the periphery of a proton-free exchange membrane by a screen printer, then an anode gas diffusion layer, a catalyst layer-membrane-catalyst layer (CCM) at the periphery of the proton-free exchange membrane and a cathode gas diffusion layer are attached, and finally the silicone rubber is cured for 24 hours at normal temperature to form a membrane electrode-gas diffusion layer assembly (MEA).

(2) A sealed and packaged runner partition plate assembly is formed by hermetically packaging an anode partition plate, a cooling liquid-cathode partition plate, the anode partition plate and the cooling liquid-cathode partition plate through adhesives, coating sulfur-free normal-temperature curing silicone rubber around the partition plate through screen printing, fitting, sealing and heating for curing.

(3) Attaching a sealing gasket on one surface of the hermetically packaged flow channel isolation plate component; the sealing gasket forms a sealing ring on the isolation plate in a dispensing mode, and the flow channel isolation plate assembly is sealed and packaged as shown in figure 3;

The material of the flow passage isolation plate is a metal resin composite material.

The flow channel isolation plate is attached with a sealing gasket for sealing reactant fluid and cooling fluid.

And the flow channel active area at one side of the flow channel isolation plate stuck with the sealing gasket is higher than 0.2 mm.

The adhesive is sulfur-free normal-temperature curing silicone rubber, and can be attached to an MEA (membrane electrode assembly) and a runner isolation plate.

The flow passage isolation plate is formed by laminating a partition, and a groove for limiting the movement of the sealing gasket is arranged on the flow passage isolation plate.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the principles of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A method for manufacturing a single cell of a proton exchange membrane fuel cell and a galvanic pile thereof is characterized by comprising the following steps:

2. The pem fuel cell unit cell and the manufacturing method of the electric pile thereof according to claim 1, wherein the MEA without the reinforced frame is prepared by adhering the anode gas diffusion layer, the cathode gas diffusion layer and the catalyst coating film together by screen printing, dispensing or template injection molding and sealing and packaging.

3. The pem fuel cell of claim 1 and the manufacturing method of the stack thereof, wherein the MEA without the reinforced frame is sealed and encapsulated in the active area of the flow channel isolation plate on the hydrogen flow field side or the air flow field side by screen printing, dispensing or template injection.

4. The pem fuel cell unit cell and the manufacturing method of the electric pile thereof as claimed in claim 1, wherein the MEA without the reinforced frame is attached and packaged by screen printing, dispensing or template injection, and the liquid adhesive is coated on the outer periphery of the MEA or the outer periphery of the active area of the flow channel separator.

5. The pem fuel cell of claim 1 and the manufacturing method of the stack thereof, wherein the material of the flow channel isolation plate is one of graphite, graphite resin composite material, graphite metal composite material, metal material and metal resin composite material.

6. The pem fuel cell and stack fabrication method of claim 1 wherein said flow-path separator plates are fitted with gaskets or seals for sealing reactant and cooling fluids.

7. The pem fuel cell of claim 1 wherein the active area of the channel on one side of the channel separator is 0.05-0.5mm higher than the active area of the channel on the other side of the channel separator to which the gasket or gasket is attached.

8. The PEM fuel cell unit cell and the method for manufacturing the stack thereof according to claim 1, wherein the adhesive is one or more of sulfur-free normal-temperature-curing silicone rubber, sulfur-free high-temperature-curing silicone rubber, fluororubber, ethylene propylene diene monomer rubber, sulfur-free UV (ultraviolet) glue or epoxy resin glue.

9. The PEM fuel cell unit cell and the manufacturing method of the cell stack thereof according to claim 6, wherein the flow channel isolation plate is formed by laminating a separator, two separators or a plurality of separators, and grooves for limiting the movement of the gasket or the seal ring are formed on the flow channel isolation plate.