CN114420964B - Metal bipolar plate for fuel cell and injection molding method of sealing member thereof - Google Patents
Metal bipolar plate for fuel cell and injection molding method of sealing member thereof Download PDFInfo
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- CN114420964B CN114420964B CN202210318341.8A CN202210318341A CN114420964B CN 114420964 B CN114420964 B CN 114420964B CN 202210318341 A CN202210318341 A CN 202210318341A CN 114420964 B CN114420964 B CN 114420964B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0286—Processes for forming seals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Fuel Cell (AREA)
Abstract
The invention provides a metal bipolar plate for a fuel cell and an injection molding method of a sealing member of the metal bipolar plate for the fuel cell, wherein the metal bipolar plate for the fuel cell realizes the injection molding of a sealing agent based on a cathode plate and an anode plate with different sizes, and solves the technical problem of abnormal deformation of the metal bipolar plate possibly caused by the sealing member of the metal bipolar plate in the injection molding process.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a metal bipolar plate for a fuel cell. The invention still further relates to a method for injection molding a seal for a metallic bipolar plate for a fuel cell.
Background
A fuel cell is a power generation device that converts chemical energy in fuel into electrical energy through an electrochemical reaction, and includes a plurality of stacked fuel cell cells, wherein each fuel cell includes a cathode plate, an anode plate, and a membrane electrode assembly interposed between the cathode plate and the anode plate. In order to ensure the normal operation of the fuel cell, the anode flow field formed between the anode plate and the membrane electrode assembly and the cathode flow field formed between the cathode plate and the membrane electrode assembly should be sealed with respect to the external environment to prevent the fuel (hydrogen) and/or the oxidant (oxygen or air) from leaking to the outside and affecting the normal reaction. Therefore, it is necessary to provide sealing members at the sealing portion of the reaction side of the cathode plate (the side of the cathode plate facing the membrane electrode assembly) and the sealing portion of the reaction side of the anode plate (the side of the anode plate facing the membrane electrode assembly) respectively to achieve the surrounding sealing of the cathode and anode flow fields respectively.
At present, the arrangement modes of the sealing element are mainly three, wherein the first mode is that the formed sealing element is directly attached to the sealing part at the reaction side of the cathode plate and the anode plate, but the operation is complex, and the subsequent electric pile assembly is inconvenient; the second is a dispensing manner, in which a fluid sealant is dispensed and coated on the sealing portions of the reaction sides of the cathode plate and the anode plate by a dispenser (a dispenser or a coater), but the dispensing amount at the head and the tail of a dispensing path is difficult to control accurately, and the thickness of the joint between the head and the tail is often too thick or too thin after the sealing element is formed; the third method is a glue injection (injection molding of the sealing element), wherein the fluid sealant is filled into the sealing part on the reaction side of the cathode plate and the anode plate in an injection mode through a mold, and the sealing element is formed after the fluid sealant is shaped.
Furthermore, with the development of the fuel cell industry, the above-mentioned injection molding (injection molding of the sealing member) is a preferred method in mass production, and especially, a method for injecting glue on both sides of the bipolar plate (the reaction side of the cathode plate and the reaction side of the anode plate) of the fuel cell is a more important research and development direction. After glue is injected to the two sides of the bipolar plates at the same time, the fuel cell stack can be assembled in an assembly mode that a membrane electrode assembly is clamped between the two adjacent bipolar plates. It will be appreciated that the bipolar plate comprises a cathode plate and an anode plate bonded or welded together with the cooling side of the cathode plate (the back side of the reaction side of the cathode plate) facing the cooling side of the anode plate (the back side of the reaction side of the anode plate) forming a coolant flow field therebetween.
The existing method for simultaneously injecting glue on two sides of a metal bipolar plate enables sealing elements to be integrally formed on the two sides of the metal bipolar plate, and fluid sealing agents are respectively and simultaneously injected on the two sides of a sealing part of the metal bipolar plate through a mould. In order to solve the above technical problem, a solution is proposed for double-side glue injection of a metal bipolar plate by providing a plurality of penetrating holes, wherein the penetrating holes penetrate through the metal bipolar plate, and penetrate through both a cathode plate and an anode plate of the metal bipolar plate. In the process of double-side glue injection of the metal bipolar plate, the fluid sealant can flow from one side of the metal bipolar plate to the other side of the metal bipolar plate through the penetrating hole, the two sides are communicated through the penetrating hole, and the pressure of the fluid sealant on the two sides to the metal bipolar plate is the same, so that the technical problem is solved.
However, the above-described technical solution also creates another technical problem. As shown in fig. 1, during the glue injection process, the fluid sealant may flow between the cathode plate and the anode plate of the metal bipolar plate through the penetration holes under pressure, destroying the structure formed by the cathode plate and the anode plate assembled in advance, and even causing the regions where the cathode plate and the anode plate are partially bonded or welded to be separated from each other. The conventional solution to the above problem is to weld or bond the cathode and anode plates to the edge where the through-hole is formed, so that the fluid sealant cannot flow into between the cathode plate and the anode plate through the through-hole. However, the above-mentioned welding or bonding process for the edges of the penetrating holes of the anode plate and the cathode plate is complicated, and has high precision requirement, great operation difficulty and high cost.
Disclosure of Invention
The invention has the main advantage of providing a metal bipolar plate for a fuel cell, which realizes the injection molding of a sealant based on a cathode plate and an anode plate with different sizes, and solves the technical problem that the sealing member of the metal bipolar plate can cause abnormal deformation of the metal bipolar plate in the injection molding process (the double-side glue injection process of the metal bipolar plate). The invention concept that the sizes of the cathode plate and the anode plate of the metal bipolar plate for the fuel cell are different overcomes the technical prejudice that the sizes of the cathode plate and the anode plate in the traditional metal bipolar plate are the same.
Another advantage of the present invention is to provide a metallic bipolar plate for a fuel cell, wherein the metallic bipolar plate includes a first plate and a second plate (one being a cathode plate and the other being an anode plate) bonded or welded to each other, wherein the first plate has a size larger than that of the second plate, and penetration holes of the metallic bipolar plate are formed at the edge-enlarged portions of the first plate, wherein the penetration holes penetrate only the first plate of the metallic bipolar plate, and the penetration holes are offset from the second plate, thereby preventing a fluid sealant from flowing between the cathode plate and the anode plate of the metallic bipolar plate through the penetration holes while ensuring the openness of the penetration holes and allowing the fluid sealant to flow from one side of the metallic bipolar plate to the other side through the penetration holes.
Another advantage of the present invention is to provide an injection molding method of a sealing member of a metallic bipolar plate, which can integrally mold the sealing member on both sides of the metallic bipolar plate, and can balance pressure of the fluid sealant on both sides of the metallic bipolar plate, and can further prevent the fluid sealant from flowing between a cathode plate and an anode plate of the metallic bipolar plate.
Other objects and features of the present invention will become more fully apparent from the following detailed description and appended claims, taken in conjunction with the accompanying drawings, wherein like reference numerals refer to like elements throughout.
Accordingly, in accordance with the present invention, a metallic bipolar plate for a fuel cell having at least one of the foregoing advantages, comprises:
a first plate, wherein said first plate comprises a folded portion and a flared portion, wherein said flared portion extends outwardly from said folded portion, wherein said folded portion of said first plate forms a reaction side and a cooling side opposite said reaction side of said folded portion; and
a second plate, wherein said second plate defines a reaction side and a cooling side opposite to said reaction side of said second plate, wherein the size of said second plate is the same as the size of the stacked portion of said first plate, wherein said second plate is fixedly disposed at the stacked portion of said first plate, wherein said cooling side of said second plate is opposite to said cooling side of said stacked portion of said first plate, such that said second plate is stacked at said stacked portion of said first plate and said second plate and said flared portion of said first plate are offset from each other;
Wherein the metal bipolar plate has a plurality of through holes for the passage of a fluid sealant, wherein the through holes are all provided at the flared portion of the first electrode plate to prevent the through holes from being blocked by the second electrode plate.
In particular, the metallic bipolar plate further comprises a seal, wherein the seal comprises a first seal portion, a second seal portion and a plurality of connection portions, wherein the first seal portion is provided at a first side of the metallic bipolar plate and the second seal portion is provided at a second side of the metallic bipolar plate, the connection portions are provided through the respective penetration holes, wherein the first seal portion, the second seal portion and the connection portions are integrally formed.
In one embodiment, the edge of the second plate is integrally welded or bonded to the first plate.
In another embodiment, the edge of the second plate is partially welded or bonded to the first plate.
Accordingly, the flow field seal of the second seal is disposed between the flared portion of the first plate and the second plate, and the flow field seal extends from the flared portion of the first plate to the second plate.
Accordingly, the flow field seal of the second seal is disposed only at the flared portion of the first plate, and the flow field seal is spaced apart from the second plate.
In particular, one of the first and second electrode plates is a cathode plate and the other is an anode plate.
According to another aspect of the present invention, the present invention further provides an injection molding method of a sealing member of a metallic bipolar plate, comprising the steps of:
s1, preparing a first plate and a second plate, wherein the first plate has a size larger than that of the second plate, wherein the first plate includes a folded portion and a flared portion, wherein the flared portion extends outwardly from the folded portion, wherein the second plate has a size identical to that of the folded portion of the first plate, wherein the folded portion of the first plate forms a reaction side and a cooling side opposite to the reaction side of the folded portion, and the second plate forms a reaction side and a cooling side opposite to the reaction side of the second plate;
s2, fixedly arranging the second polar plate on the superposition part of the first polar plate, wherein the cooling side of the second polar plate is opposite to the cooling side of the superposition part of the first polar plate;
S3, placing the fixed first polar plate and the second polar plate in a mould, and injecting a fluid sealant to one side or two sides of the metal bipolar plate through the mould, wherein the fluid sealant can flow from one side to the other side of the metal bipolar plate through the penetrating holes of the metal bipolar plate; and
and S4, demolding after the fluid sealant is solidified to form the sealing element.
In particular, the method further comprises the following step before the step S3:
and a plurality of penetrating holes are formed in the edge expanding part of the first polar plate.
In particular, the step S2 further includes the steps of:
and welding or bonding the edge of the second polar plate to the first polar plate.
The above and other advantages of the invention will be more fully apparent from the following description and drawings.
The above and other advantages and features of the present invention will be more fully apparent from the following detailed description of the invention and the accompanying drawings.
Drawings
Fig. 1 shows a drawback of a current injection molding method (glue injection method) in which a sealing member is integrally formed on both sides of a metallic bipolar plate, which highlights the possibility that a fluid sealant may flow between a cathode plate and an anode plate of the metallic bipolar plate while passing through a penetration hole.
Fig. 2 is a schematic plan view of a second side of a metallic bipolar plate for a fuel cell according to an embodiment of the present invention, with its seals hidden.
Figure 3 is a schematic plan view of the reaction side of the first plate of the metallic bipolar plate according to an embodiment of the present invention.
Figure 4 is a schematic plan view of the reaction side of the second plate of the metallic bipolar plate according to an embodiment of the present invention.
Figure 5 is a schematic plan view of the second side of the metallic bipolar plate showing a second seal portion of the seal in accordance with an embodiment of the present invention.
Fig. 6 is a schematic cross-sectional view of a metallic bipolar plate according to an embodiment of the present invention, showing one step of forming a seal of the metallic bipolar plate, in which the cross-sections of the first plate and the second plate are only schematic cross-sections.
Fig. 7 is a schematic cross-sectional view of a metallic bipolar plate according to another embodiment of the present invention, showing another step of forming a seal of the metallic bipolar plate, in which the cross-sections of the first and second plates are only schematic cross-sections.
Figure 8 is a flow chart of a method of injection molding a seal for a metallic bipolar plate according to an embodiment of the present invention.
Detailed Description
The following description is provided to enable any person skilled in the art to practice the invention. Other obvious substitutions, modifications and variations will occur to those skilled in the art. Accordingly, the scope of protection of the invention should not be limited by the exemplary embodiments described herein.
It will be understood by those of ordinary skill in the art that, unless specifically indicated herein, the terms "a" and "an" should be interpreted as meaning that "at least one" or "one or more" may mean that, in one embodiment, one element may be present in one number, and in another embodiment, the element may be present in multiple numbers.
It will be understood by those of ordinary skill in the art that unless otherwise specified herein, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positions illustrated in the drawings for convenience in describing the invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation or position. Accordingly, the above terms should not be construed as limiting the present invention.
Referring to fig. 2 through 6 of the accompanying drawings, a metallic bipolar plate for a fuel cell according to an embodiment of the present invention is illustrated. As shown in fig. 2 to 6, the metal bipolar plate includes a first plate 1 and a second plate 2, wherein the first plate 1 and the second plate 2 are fixedly disposed together by welding or bonding. It is understood that one of the first electrode plate 1 and the second electrode plate 2 is a cathode plate and the other is an anode plate. In other words, when the first electrode plate 1 is a cathode plate, the second electrode plate 2 is an anode plate, and when the first electrode plate 1 is an anode plate, the second electrode plate 2 is a cathode plate.
As shown in fig. 2 to 6 of the specification, the first electrode plate 1 and the second electrode plate 2 of the metallic bipolar plate for a fuel cell according to the embodiment of the present invention each have a reaction side and a cooling side. Fig. 3 is a schematic plan view of the reaction side of the first plate 1, the back side of the first plate 1 is the cooling side of the first plate 1, and the reaction side and the cooling side of the first plate 1 are opposite to each other. Fig. 4 is a schematic plan view of the reaction side of the second plate 2, the back side of the second plate 2 is the cooling side of the second plate 2, and the reaction side and the cooling side of the second plate 2 are opposite to each other. Fig. 2 is a schematic plan view of one side of the metallic bipolar plate, wherein the cooling side of the first plate 1 faces the cooling side of the second plate 2. As shown in fig. 2 to 6, the first plate 1 of the metal bipolar plate for a fuel cell according to the embodiment of the present invention includes a lamination portion 11 and a flared portion 12, wherein the flared portion 12 extends outward from the lamination portion 11 to form an outer edge of the first plate 1, wherein the second plate 2 has the same size as the lamination portion 11 of the first plate 1, wherein the second plate 2 is fixedly disposed on the lamination portion 11 of the first plate 1, and the cooling side of the second plate 2 faces the lamination portion 11 of the first plate 1, such that the second plate 2 is overlapped on the lamination portion 11 of the first plate 1 and the second plate 2 and the flared portion 12 of the first plate 1 are offset from each other. In other words, the second electrode plate 2 of the metallic bipolar plate for a fuel cell of the present invention and the overlapped portion 11 of the first electrode plate 1 constitute a laminated structure, and the second electrode plate 2 and the enlarged portion 12 of the first electrode plate 1 are offset from each other such that both sides of the enlarged portion 12 of the first electrode plate 1 are exposed.
Further, in order to equalize the pressure of the fluid sealant to both sides of the metal bipolar plate during the injection molding process of the sealing member 3 of the metal bipolar plate (the double-sided glue injection process of the metal bipolar plate), the metal bipolar plate is further provided with a plurality of penetration holes 120 for flowing the fluid sealant, wherein the penetration holes 120 are each provided at the flared portion 12 of the first plate 1, wherein the penetration holes 120 penetrate only the first plate 1 of the metal bipolar plate. In addition, both sides of the flared portion 12 of the first electrode plate 1 are exposed, and thus, the penetration holes 120 are open and not blocked by the second electrode plate 2. Accordingly, when the fluid sealant flows from one side of the first electrode plate 1 to the other side of the first electrode plate 1 through the penetration hole 120, the fluid sealant does not directly contact the overlapped portion of the first electrode plate 1 and the second electrode plate 2, so that it is possible to prevent the fluid sealant from flowing (or infiltrating) between the first electrode plate 1 and the second electrode plate 2 of the metal bipolar plate during the passage through the penetration hole 120 while ensuring the smooth passage of the fluid sealant through the penetration hole 120 to flow from one side of the metal bipolar plate to the other side. In other words, since the fluid sealant flows from one side to the other side of the metallic bipolar plate for a fuel cell of the present invention, the fluid sealant is in contact with only the first plate 1 and only the first plate 1 is subjected to the fluid sealant pressure, thereby preventing the fluid sealant from flowing between the first plate 1 and the second plate 2 of the metallic bipolar plate through the penetration hole 120. In addition, the size of the first electrode plate 1 is larger than that of the second electrode plate 2, so that the part exposed to the fluid sealant between the first electrode plate 1 and the second electrode plate 2 is easier to seal (for example, welding or bonding sealing).
Conventionally, a bipolar plate for a fuel cell, whether a graphite bipolar plate or a metal bipolar plate, is configured to have the same size and the same outer contour shape (the size and the shape of the outer contour of the cathode plate and the anode plate are the same) in order to facilitate the accurate alignment of the cathode plate and the anode plate. This conventional design inherently has undeniable advantages, but gradually becomes a shackle limiting the innovative design of the bipolar plate, and leads those skilled in the fuel cell field to avoid considering the technical advantages of the different-sized cathode and anode plates in solving other technical problems, thus hindering those skilled in the art from researching and developing in this direction. The invention overcomes the technical bias that the cathode plate and the anode plate should have the same size, adopts the technical means (the cathode plate and the anode plate with different sizes) which is abandoned due to the technical bias, and provides a new technical scheme based on the technical means so as to solve the technical problem that the sealing element 3 of the metal bipolar plate is likely to cause abnormal deformation of the metal bipolar plate in the injection molding process (the double-side glue injection process of the metal bipolar plate). This is a particular difficulty with the metallic bipolar plates of the present invention used in fuel cells.
In conjunction with the above description and the present invention, fig. 6 and 7, the metal bipolar plate further includes the sealing member 3, wherein the sealing member 3 includes a first sealing portion 31, a second sealing portion 32, and a plurality of connection portions 33, wherein the first sealing portion 31 is disposed at a first side of the metal bipolar plate, the second sealing portion 32 is disposed at a second side of the metal bipolar plate (or, the first sealing portion 31 and the second sealing portion 32 are disposed at both sides of the first plate 1, respectively), wherein the connection portions 33 are penetrated through the corresponding penetration holes 120, and wherein the first sealing portion 31, the second sealing portion 32, and the connection portions 33 are integrally formed. In other words, the connecting portions 33 are inserted through the respective penetration holes 120 and integrally connect the first sealing portion 31 and the second sealing portion 32. As shown in fig. 6 and 7, in particular, the first sealing portion 31 of the sealing member 3 of the metal bipolar plate for a fuel cell according to the present invention is disposed on the first side 100 of the metal bipolar plate, and the second sealing portion 32 of the sealing member 3 is disposed on the second side 200 of the metal bipolar plate. It is understood that the number of the connection parts 33 is the same as the number of the penetration holes 120.
Specifically, the second side 200 of the metallic bipolar plate is shown in fig. 5 of the drawings accompanying this specification, and the second seal portion 32 of the seal 3 is shown. The second sealing portion 32 of the sealing member 3 of the metallic bipolar plate for a fuel cell of the present invention comprises a flow field sealing portion 321, wherein the flow field sealing portion 321 is disposed around the entire flow field (including the reaction flow field, gas and coolant inlets and outlets) of the second side 200 of the metallic bipolar plate for circumferentially sealing the entire flow field at the second side 200 of the metallic bipolar plate.
Further, fig. 6 and 7 show cross-sections of two different embodiments of the seal 3, respectively, and the cross-section of the second sealing portion 32 of the seal 3 shown in the two figures is specifically the cross-section of the flow field sealing portion 321 of the second sealing portion 32. As shown in fig. 6, in this embodiment, the flow field sealing portion 321 of the second sealing portion 32 is disposed on the flared portion 12 of the first plate 1 of the metal bipolar plate and the second plate 2 of the metal bipolar plate, in other words, a portion of the flow field sealing portion 321 of the second sealing portion 32 is disposed on the flared portion 12 of the first plate 1, and another portion is disposed on the second plate 2, wherein the flow field sealing portion 321 of the second sealing portion 32 extends from the flared portion 12 of the first plate 1 to the second plate 2. This embodiment has an advantage in that the size of the flared portion 12 of the first plate 1 can be reduced, thereby reducing the size of the entire metal bipolar plate. However, in order to prevent the fluid sealant from flowing in between the edge of the second electrode plate 2 and the first electrode plate 1 during the injection molding process of the sealing member 3 (the double-sided glue injection process of the metal bipolar plate), the edge of the second electrode plate 2 should be disposed to closely adhere to the first electrode plate 1. Preferably, the edge of the second plate 2 is welded or bonded to the first plate 1 completely. As shown in fig. 7, in this embodiment, the flow field seal 321 of the second seal 32 is only disposed at the flared portion 12 of the first plate 1 of the metal bipolar plate, in other words, the flow field seal 321 of the second seal 32 is spaced apart from the second plate 2. This embodiment has an advantage in that the fluid sealant for forming the flow field seal 321 does not flow between the edge of the second plate 2 and the first plate 1 during the injection molding process of the sealing member 3 (the double-sided glue injection process of the metal bipolar plate), the edge of the second plate 2 does not have to be completely welded or bonded to the first plate 1, and only a specific region of the edge of the second plate 2 needs to be welded or bonded. Of course, in this embodiment, the edge-enlarged portion 12 of the first plate 1 needs to provide a sufficient space for the flow field seal 321 of the second seal 32.
According to the above description of the metallic bipolar plate for a fuel cell of the present invention with reference to fig. 8, the injection molding method of the sealing member of the metallic bipolar plate according to the embodiment of the present invention includes the steps of:
s1, preparing a first plate and a second plate, wherein the first plate has a size larger than that of the second plate, wherein the first plate includes a folded portion and a flared portion, wherein the flared portion extends outwardly from the folded portion, wherein the second plate has a size identical to that of the folded portion of the first plate, wherein the folded portion of the first plate forms a reaction side and a cooling side opposite to the reaction side of the folded portion, and the second plate forms a reaction side and a cooling side opposite to the reaction side of the second plate;
s2, fixedly arranging the second polar plate on the superposition part of the first polar plate, wherein the cooling side of the second polar plate is opposite to the cooling side of the superposition part of the first polar plate;
s3, placing the fixed first polar plate and the second polar plate in a mould, and injecting a fluid sealant to one side or two sides of the metal bipolar plate through the mould, wherein the fluid sealant can flow from one side to the other side of the metal bipolar plate through the penetrating holes of the metal bipolar plate; and
And S4, demolding after the fluid sealant is solidified to form the sealing element.
In particular, the method further comprises the following step before the step S3: and a plurality of penetrating holes are formed in the edge expanding part of the first polar plate. It is understood that the step of forming the through-hole is not affected by the second electrode plate, and may be performed simultaneously when the first electrode plate is prepared in the step S1, or may be performed after the first electrode plate and the second electrode plate are fixed together and then the through-hole is formed at the edge-expanded portion of the first electrode plate after the step S2.
Specifically, the step S2 further includes the steps of: and welding or bonding the edge of the second polar plate to the first polar plate.
In an embodiment of the present invention, the step S2 includes the steps of: and completely welding or bonding the edge of the second polar plate to the first polar plate.
In another embodiment of the present invention, the step S2 includes the steps of: and partially welding or bonding the edge of the second polar plate to the first polar plate.
It will be understood by those of ordinary skill in the art that the embodiments described above and shown in the drawings are merely for illustrative purposes and are not intended to limit the present invention. All equivalent implementations, modifications and improvements that are within the spirit of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A method of injection molding a seal member for a metallic bipolar plate for a fuel cell, comprising the steps of:
s1, preparing a first plate and a second plate, wherein the first plate has a size larger than that of the second plate, wherein the first plate includes a folded portion and a flared portion, wherein the flared portion extends outwardly from the folded portion, wherein the second plate has a size identical to that of the folded portion of the first plate, wherein the folded portion of the first plate forms a reaction side and a cooling side opposite to the reaction side of the folded portion, and the second plate forms a reaction side and a cooling side opposite to the reaction side of the second plate;
s2, fixedly arranging the second polar plate on the superposition part of the first polar plate, wherein the cooling side of the second polar plate is opposite to the cooling side of the superposition part of the first polar plate;
s3, placing the fixed first polar plate and the second polar plate in a mould, and injecting a fluid sealant to one side or two sides of the metal bipolar plate through the mould, wherein the fluid sealant can flow from one side to the other side of the metal bipolar plate through the penetrating holes of the metal bipolar plate;
S4, demolding after the fluid sealant is solidified to form the sealing element; and
before the step S3, the method further includes the steps of:
and a plurality of penetrating holes are formed in the edge expanding part of the first polar plate.
2. The injection molding method of a sealing member of a metallic bipolar plate according to claim 1, further comprising the step of, in the step S2:
and welding or bonding the edge of the second polar plate to the first polar plate.
3. A metallic bipolar plate for a fuel cell, comprising:
a first plate, wherein said first plate comprises a folded portion and a flared portion, wherein said flared portion extends outwardly from said folded portion, wherein said folded portion of said first plate forms a reaction side and a cooling side opposite said reaction side of said folded portion; and
a second plate, wherein said second plate defines a reaction side and a cooling side opposite to said reaction side of said second plate, wherein the size of said second plate is the same as the size of the stacked portion of said first plate, wherein said second plate is fixedly disposed at the stacked portion of said first plate, wherein said cooling side of said second plate is opposite to said cooling side of said stacked portion of said first plate, such that said second plate is stacked at said stacked portion of said first plate and said second plate and said flared portion of said first plate are offset from each other;
Wherein the metal bipolar plate has a plurality of through holes for the fluid sealant to flow through, wherein the through holes are all provided at the flared portion of the first electrode plate to prevent the through holes from being blocked by the second electrode plate.
4. The metallic bipolar plate for a fuel cell as recited in claim 3, further comprising a seal, wherein the seal comprises a first seal portion, a second seal portion and a plurality of connection portions, wherein the first seal portion is disposed on a first side of the metallic bipolar plate, the second seal portion is disposed on a second side of the metallic bipolar plate, the connection portions are disposed through the respective through holes, wherein the first seal portion, the second seal portion and the connection portions are integrally formed.
5. The metallic bipolar plate for a fuel cell as claimed in claim 4, wherein an edge of the second plate is integrally welded or bonded to the first plate.
6. The metallic bipolar plate for a fuel cell as claimed in claim 4, wherein an edge of the second plate is partially welded or bonded to the first plate.
7. The metallic bipolar plate for a fuel cell as claimed in claim 5, wherein the flow field seal of the second seal is provided at the flared portion of the first plate and the second plate, and the flow field seal extends from the flared portion of the first plate to the second plate.
8. The metallic bipolar plate for a fuel cell as set forth in claim 5 or 6, wherein the flow field seal of the second seal portion is provided only at the flared portion of the first plate, and the flow field seal portion is spaced apart from the second plate.
9. The metallic bipolar plate for a fuel cell as set forth in claim 5 or 6, wherein the sealing member is manufactured by an injection molding method of the sealing member of the metallic bipolar plate set forth in claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210318341.8A CN114420964B (en) | 2022-03-29 | 2022-03-29 | Metal bipolar plate for fuel cell and injection molding method of sealing member thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210318341.8A CN114420964B (en) | 2022-03-29 | 2022-03-29 | Metal bipolar plate for fuel cell and injection molding method of sealing member thereof |
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| US6852439B2 (en) * | 2001-05-15 | 2005-02-08 | Hydrogenics Corporation | Apparatus for and method of forming seals in fuel cells and fuel cell stacks |
| CN109560305B (en) * | 2019-01-03 | 2024-02-09 | 浙江锋源氢能科技有限公司 | Metal bipolar plate and processing method |
| CN210837959U (en) * | 2019-11-21 | 2020-06-23 | 安特(苏州)精密机械有限公司 | Glue injection structure for one-step injection molding of metal bipolar plate sealant |
| CN112736264A (en) * | 2021-02-08 | 2021-04-30 | 上海治臻新能源装备有限公司 | Seal groove structure for realizing sealing integrated injection molding of metal bipolar plate |
| CN215527767U (en) * | 2021-06-29 | 2022-01-14 | 鸿基创能科技(广州)有限公司 | Assembly structure of membrane electrode and bipolar plate and electric pile comprising assembly structure |
| CN215896455U (en) * | 2021-09-07 | 2022-02-22 | 武汉众宇动力系统科技有限公司 | Limiting device for bonding bipolar plate of fuel cell |
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