CN1320673C - Guide polar plate for proton exchanging membrane fuel battery and producing method thereof - Google Patents
Guide polar plate for proton exchanging membrane fuel battery and producing method thereof Download PDFInfo
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- CN1320673C CN1320673C CNB031290701A CN03129070A CN1320673C CN 1320673 C CN1320673 C CN 1320673C CN B031290701 A CNB031290701 A CN B031290701A CN 03129070 A CN03129070 A CN 03129070A CN 1320673 C CN1320673 C CN 1320673C
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The present invention relates to a flow guiding electrode plate for proton exchange membrane fuel batteries and a method for manufacturing the flow guiding electrode plate. The flow guiding electrode plate comprises an air flow guiding channel surface and a hydrogen flow guiding channel surface which are arranged on the front surface and the back surface of the flow guiding electrode plate, and an air flow guiding inlet hole, an air flow guiding outlet hole, a hydrogen flow guiding inlet hole and a hydrogen flow guiding outlet hole which are arranged at both ends of the electrode plate. The present invention is characterized in that the electrode plate also comprises a cooling fluid guiding channel arranged between the air flow guiding channel surface and the hydrogen flow guiding channel surface, and a cooling fluid guiding inlet hole and a cooling fluid guiding outlet hole which are arranged at both ends of the cooling fluid guiding channel. The method comprises the processing steps of reinforces net or reinforced layer manufacture, mold pressing forming, etc. Compared with the prior art, the present invention has the advantages of high mechanical strength, light weight, favorable electrical conductivity, no pollution and toxic harm to proton exchange membrane fuel batteries if running for a long time, low price, etc.
Description
Technical Field
The invention relates to a fuel cell, in particular to a flow guide polar plate which can be used as a proton exchange membrane fuel cell and a manufacturing method thereof.
Background
An electrochemical fuel cell is a device capable of converting hydrogen and an oxidant into electrical energy and reaction products. The inner core component of the device is a Membrane Electrode (MEA), which is composed of a proton exchange Membrane and two porous conductive materials sandwiched between two surfaces of the Membrane, such as carbon paper. The membrane contains a uniform and finely dispersed catalyst, such as a platinum metal catalyst, for initiating an electrochemical reaction at the interface between the membrane and the carbon paper. The electrons generated in the electrochemical reaction process can be led out by conductive objects at two sides of the membrane electrode through an external circuit to form a current loop.
At the anode end of the membrane electrode, fuel can permeate through a porous diffusion material (carbon paper) and undergo electrochemical reaction on the surface of a catalyst to lose electrons to form positive ions, and the positive ions can pass through a proton exchange membrane through migration to reach the cathode end at the other end of the membrane electrode. At the cathode end of the membrane electrode, a gas containing an oxidant (e.g., oxygen), such as air, forms negative ions by permeating through a porous diffusion material (carbon paper) and electrochemically reacting on the surface of the catalyst to give electrons. The anions formed at the cathode end react with the positive ions transferred from the anode end to form reaction products.
In a pem fuel cell using hydrogen as the fuel and oxygen-containing air as the oxidant (or pure oxygen as the oxidant), the catalytic electrochemical reaction of the fuel hydrogen in the anode region produces hydrogen cations (or protons). The proton exchange membrane assists the migration of positive hydrogen ions from the anode region to the cathode region. In addition, the proton exchange membrane separates the hydrogen-containing fuel gas stream from the oxygen-containing gas stream so that they do not mix with each other to cause explosive reactions.
In the cathode region, oxygen gains electrons on the catalyst surface, forming negative ions, which react with the hydrogen positive ions transported from the anode region to produce water as a reaction product. In a proton exchange membrane fuel cell using hydrogen, air (oxygen), the anode reaction and the cathode reaction can be expressed by the following equations:
and (3) anode reaction:
and (3) cathode reaction:
in a typical pem fuel cell, a Membrane Electrode (MEA) is generally placed between two conductive plates, and the surface of each conductive plate in contact with the MEA is die-cast, stamped, or mechanically milled to form at least one or more channels. The conductive film electrode plates can be plates made of metal materials or plates made of graphite materials. The diversion pore canals and the diversion grooves on the membrane electrode guiding plates respectively guide the fuel and the oxidant into the anode area andthe cathode area on two sides of the membrane electrode. In the structure of a single proton exchange membrane fuel cell, only one membrane electrode is present, and a guide plate of anode fuel and a guide plate of cathode oxidant are respectively arranged on two sides of the membrane electrode. The guide plates are used as current collector plates and mechanical supports at two sides of the membrane electrode, and the guide grooves on the guide plates are also used as channels for fuel and oxidant to enter the surfaces of the anode and the cathode and as channels for taking away water generated in the operation process of the fuel cell.
In order to increase the total power of the whole proton exchange membrane fuel cell, two or more single cells can be connected in series to form a battery pack in a straight-stacked manner or connected in a flat-laid manner to form a battery pack. In the direct-stacking and serial-type battery pack, two surfaces of one polar plate can be provided with flow guide grooves, wherein one surface can be used as an anode flow guide surface of one membrane electrode, and the other surface can be used as a cathode flow guide surface of another adjacent membrane electrode, and the polar plate is called a bipolar plate. A series of cells are connected together in a manner to form a battery pack. The battery pack is generally fastened together into one body by a front end plate, a rear end plate and a tie rod.
A typical battery pack generally includes: (1) the fuel (such as hydrogen, methanol or hydrogen-rich gas obtained by reforming methanol, natural gas and gasoline) and the oxidant (mainly oxygen or air) are uniformly distributed in the diversion trenches of the anode surface and the cathode surface; (2) the inlet and outlet of cooling fluid (such as water) and the flow guide channel uniformly distribute the cooling fluid into the cooling channels in each battery pack, and the heat generated by the electrochemical exothermic reaction of hydrogen and oxygen in the fuel cell is absorbed and taken out of the battery pack for heat dissipation; (3) the outlets of the fuel gas and the oxidant gas and the corresponding flow guide channels can carry out liquid and vapor water generated in the fuel cell when the fuel gas and the oxidant gas are discharged. Typically, all fuel, oxidant, and cooling fluid inlets and outlets are provided in one or both end plates of the fuel cell stack.
The proton exchange membrane fuel cell has wide application, can be used as a power system of all vehicles, ships and other vehicles, and can also be used as a power generation system as a ground fixed power station, a movable power source and the like.
At present, the manufacturing cost of the proton exchange membrane fuel cell is higher, and the price of materials of certain key parts for forming the fuel cell is higher. The flow guide plate in the proton exchange membrane fuel cell is one of the most critical components of the fuel cell, and the price thereof has a decisive influence on the manufacturing cost of the whole fuel cell.
The material used as the flow guide polar plate in the proton exchange membrane fuel cell has higher requirements, and mainly has the following requirements: (1) the material has certain mechanical strength and hardness, and is not easy to crack or break; (2) excellent electrical and thermal conductors; (3) the shape and the diversion holes of the diversion groove on the diversion polar plate are easy to process; (4) when the fuel cell works for a long time, the fuel cell can not be polluted or corroded and deteriorated.
At present, a few materials which can completely meet the requirements are available, and only a few expensive materials, such as high-quality pure graphite plate materials, high-quality titanium alloy plate materials, gold-plated or special metal plates and the like, can be used as the guide plate materials of the proton exchange membrane fuel cell. However, these materials are expensive, and the machining of the flow guide grooves and flow guide holes is time-consuming and expensive, so that the cost of the whole fuel cell is high, and the industrialization process of the fuel cell is seriously hindered.
In order to reduce the cost of the pem fuel cell baffle material, there are a number of patent applications that attempt to find a corresponding inexpensive alternative, and these patents are grouped together into the following categories: (1) the surface modification treatment is carried out by using a cheap metal plate such as a stainless steel plate. For example, the patent of "machined metal bipolar plate for proton exchange membrane fuel cell stack" applied by the institute of chemical and physical research, university of Chinese academy of sciences (patent number: 99113159.2). (2) The composite board is prepared by hot pressing graphite powder and adhesive resin, such as thermosetting resin, phenolic resin, etc. (3) The soft graphite plate is adopted for compression molding, and then the soft graphite plate is impregnated with resin and hardened into the bipolar plate. For example, the method described in US Patent 5,521,018 is compression molding using soft graphite plates.
Fuel cell bipolar flow plates are typically assembled from two plates. The two plates have the functions of an air guide groove surface and a hydrogen guide groove surface respectively, and a cooling fluid is formed between the two plates after combination. For example, the cooling fluid jacket plate surface, the cooling fluid guiding groove surface and six guiding holes (air inlet, air outlet, hydrogen inlet, hydrogen outlet, cooling fluid inlet, cooling fluid outlet).
The structure of US Patent 5,521,018, for example, is shown in fig. 1, 2, 3. Fig.1 includes a hydrogen tank 1, a hydrogen guiding flow hole 2, a sealing groove 3, a baffle 4, an air guiding flow hole 5, and a cooling fluid guiding hole 6. Thus, the front side of the air guide groove is a smooth plate surface; and a bipolar plate is composed of a front hydrogen guide groove surface and a back cooling fluid guide groove surface, or a front hydrogen guide groove surface and a back smooth surface, and a front air guide groove surface and a back cooling fluid guide groove surface. The bipolar plate has the following characteristics: (1) is formed by combining two plates; (2) the middle of the two plates is used for guiding cooling fluid.
The above prior art has the following defects: (1) the surface modification treatment difficulty of the metal plate, such as the cheap metal plate of stainless steel, aluminum and the like, is high, and when the metal plate is used as a flow guide polar plate in a proton exchange membrane fuel cell, the surface performance is reduced after long-time operation, such as the resistance is increased or the corrosion resistance is reduced, and the pollution is caused to the electrode. (2) Although the graphite powder and resin are used for one-step molding of the molded guide pole plate, the technology is mature, but the fuel cell stack is required to have high power density at present, and the main method for improving the power density of the fuel cell stack is to adopt an ultra-thin guide pole plate, so that the mechanical strength of the ultra-thin guide pole plate molded by one-step molding is greatly reduced. When the vibration type flow guide pole plate is used as a vehicle-mounted power system, the flow guide pole plate is easy to break due to vibration. (3) The soft graphite plate is adopted to be pressed into the flow guide polar plate by one-step forming, and the resin dipping hardening treatment technology also has the technical defects similar to those of the point (2), and when the soft graphite plate is used as an ultra-thin flow guide polar plate and applied to a fuel cell engine or a mobile power supply, the flow guide polar plate is easy to crack due to vibration. (4) The bipolar plate technology which is composed of two plates and has an air guide groove surface, a hydrogen guide groove surface and a cooling fluid guide groove surface is adopted, so that troubles are brought to the aspects of combination sealing of the two plates and the like, the thickness of the bipolar plate is greatly increased, and the power density of a cell stack is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a flow guide polar plate which has high mechanical strength, light weight, good conductivity, no toxicity and pollution to a proton exchange membrane fuel cell after long-term operation and low cost and can be used as the proton exchange membrane fuel cell and a manufacturing method thereof.
The purpose of the invention can be realized by the following technical scheme:
the flow guide polar plate for proton exchange membrane fuel cell includes air flow guide slot surfaces, hydrogen flow guide slot surfaces, air inlet and outlet flow guide holes and hydrogen inlet and outlet flow guide holes, which are set on the front and back surfaces of the polar plate.
The cooling fluid guiding channel comprises a reinforcing net with a cooling fluid guiding function, the longitudinal line of the reinforcing net is a hollow thin tube for guiding cooling fluid, the transverse line of the reinforcing net is a reinforcing strip for connecting each hollow thin tube, the thickness of the reinforcing strip is consistent with that of each hollow thin tube, and the upper end and the lower end of each hollow thin tube are respectively communicated with a cooling fluid inlet and outlet hole.
The cooling fluid guiding channel comprises a reinforcing layer with a cooling fluid guiding function, the reinforcing layer is composed of two layers of thin steel sheets and at least two separating strips arranged between the two layers of thin steel sheets, the separating strips are longitudinally arranged, a channel for cooling fluid to pass through is formed between the two separating strips, and the upper end and the lower end of the channel are respectively communicated with a cooling fluid inlet and outlet hole.
A method for manufacturing a flow guide polar plate used as a proton exchange membrane fuel cell is characterized by comprising the following process steps:
(1) manufacture of reinforcing nets
Firstly, longitudinally arranging hollow thin tubes for guiding cooling fluid, respectively communicating the upper ends and the lower ends of the hollow thin tubes with cooling fluid inlet and outlet holes, transversely arranging reinforcing strips with the same thickness as the hollow thin tubes, and fixedly connecting the reinforcing strips with the hollow thin tubes to form a thin reinforcing net;
(2) compression molding
And (2) filling the evenly mixed graphite powder and bonding resin material into the front and back surfaces of the reinforcing mesh obtained in the step (1), and placing the reinforcing mesh into a die for compression molding to obtain the flow guide polar plate capable of being used as a proton exchange membrane fuel cell.
A method for manufacturing a flow guide polar plate used as a proton exchange membrane fuel cell is characterized by comprising the following process steps:
(1) making the reinforcing layer
Firstly, two thin steel sheets aretaken, then at least two separating strips are arranged between the two thin steel sheets, the separating strips are arranged along the longitudinal direction, a fluid channel for cooling fluid to pass through is formed between every two separating strips, and the upper end and the lower end of the fluid channel are respectively communicated with a hole for leading in and out cooling fluid, so that a reinforcing layer with the function of leading the cooling fluid is formed;
(2) compression molding
And (2) filling the front and back surfaces of the reinforcing layer obtained in the step (1) with uniformly mixed graphite powder and bonding resin materials, and placing the reinforcing layer into a die for compression molding to obtain the flow guide polar plate capable of being used as a proton exchange membrane fuel cell.
In the step (2), the filler on the front surface and the back surface of the reinforcing net or the reinforcing layer adopts soft graphite plates to replace graphite powder and bonding resin materials.
The hollow tubule adopts a stainless steel tube or an engineering plastic tube, and the reinforcing bar adopts a corresponding solid stainless steel bar or an engineering plastic bar.
The thin steel sheet is made of thin stainless steel sheet.
Compared with the prior art, the invention has the following characteristics: (1) the inside lining of the bipolar plate is provided with a reinforcing net woven by a plurality of hollow thin tubes and solid thin strips, or is provided with a reinforcing layer formed by two thin steel sheets and a plurality of separating strips, and the reinforcing net or the reinforcing layer can be very thin, so that the power density of the fuel cell stack is greatly improved. (2) The whole bipolar plate has greatly improved strength due to the internal reinforcing net or reinforcing layer gasket. (3) The whole bipolar plate is a whole, can be molded at one time, has the function of cooling fluid diversion, and has compact product structure, strong integrity and simple manufacturing process. (4) The bipolar plate avoids the defects of the bipolar plate combined by two plates, such as poor overlapping seal between the two plates, large thickness and the like.
Drawings
FIG. 1 is a schematic view of a flow field and a flow guide hole of an air guide groove surface or a hydrogen guide groove surface;
FIG. 2 is a schematic view of a structure of a back light plate and a flow guide hole of an air guide groove surface or a hydrogen guide groove surface;
fig. 3 is a schematic structural view of a flow field and a flow guide hole for guiding cooling fluid on the back of an air guide groove surface or a hydrogen guide groove surface in the prior art;
FIG. 4 is a schematic view of a reinforcing mesh with a function of guiding cooling fluid according to the present invention;
FIG. 5 is a schematic view of the construction of a flow directing bipolar plate of the present invention;
FIG. 6 is a schematic view of the structure of the reinforcement layer with the function of guiding cooling fluid according to the present invention;
fig. 7 is a left side view of fig. 6.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
Example 1
As shown in fig. 4 and 5, a flow guide plate for a pem fuel cell includes air flow guide grooves 4a and hydrogen flow guide grooves 4b disposed on the front and back surfaces, and air inlet and outlet holes 5,5 ' and hydrogen inlet and outlet holes 2, 2 ' disposed at the two ends of the plate, and further includes a cooling fluid channel 12 disposed between the air flow guide grooves 4a and the hydrogen flow guide grooves 4b, and cooling fluid inlet and outlet holes 6, 6 ' disposed at the two ends of the channel 12.
The cooling fluid guiding channel 12 comprises a reinforcing net with a cooling fluid guiding function, the longitudinal line of the reinforcing net is a hollow thin tube 7 for guiding cooling fluid, the transverse line of the reinforcing net is a reinforcing strip 8 for connecting each hollow thin tube, the thickness of the reinforcing strip 8 is consistent with that of the hollow thin tube 7, and the upper end and the lower end of the hollow thin tube 7 are respectively communicated with a cooling fluid inlet hole 6 and a cooling fluid outlet hole 6' of the cooling fluid inlet hole and the cooling fluid outlet hole 6.
The manufacturing method of the flow guide polar plate which can be used as the proton exchange membrane fuel cell comprises the following process steps:
the first step is as follows: manufacturing a reinforcing net with a function of guiding cooling fluid, as shown in fig. 4, arranging hollow thin tubes 7 capable of guiding cooling fluid longitudinally, communicating the upper and lower ends with inlet and outlet cooling fluid holes (dies) 6, 6' respectively, arranging reinforcing strips 8 with the same thickness as the hollow thin tubes 7 transversely, and fixedly connecting the reinforcing strips with the hollow thin tubes 7 to form a thin (0.5mm) reinforcing net; the hollow tubule 7 adopts a stainless steel tube or an engineering plastic tube, and the reinforcing strip 8 adopts a corresponding solid stainless steel strip or an engineering plastic strip.
The second step is that: and (3) manufacturing a flow guide bipolar plate, filling the uniformly mixed graphite powder and bonding resin filler into the front and back surfaces of the thin reinforcing net with the function of guiding and cooling fluid obtained in the first step, and putting the reinforcing net into a mould for one-time compression molding to obtain the flow guide bipolar plate. The flow-guiding bipolar plate is shown in fig. 5, the front and back surfaces of the flow-guiding bipolar plate are air flow-guiding groove surfaces and hydrogen flow-guiding groove surfaces, the upper and lower ends of the bipolar plate are respectively provided with six flow-guiding holes, which are hydrogen flow-guiding holes 2, 2 ', air flow-guiding holes 5,5 ', cooling fluid guiding holes 6, 6 ', wherein the middle flow-guiding hole 6, 6 ' is a cooling fluid guiding hole, cooling fluid, such as water, enters through the cooling fluid guiding hole 6, and flows to the fluid guiding hole 6 ' again along the reinforcing mesh of each hollow thin tube of the inner gasket of the bipolar plate.
Such a bipolar plate structure has the following features: (1) the inner lining of the bipolar plate is provided with a reinforcing net which is woven by a plurality of hollow thin tubes and solid thin strips, and the net is very thin and is generally about 0.5 mm. (2) The whole bipolar plate has an internal reinforcing mesh gasket, so that the strength is greatly increased. (3) The whole bipolar plate is a whole, can be molded at one time, has the function of cooling fluid diversion, and can be very thin, about 1.0 mm. This greatly increases the power density of the fuel cell stack. (4) The bipolar plate avoids the defects of the bipolar plate combined by two plates, such as the overlapping seal between the two plates, the increased thickness and the like.
Example 2
As shown in fig. 5, fig. 6 and fig. 7, a flow guide plate for a pem fuel cell comprises air guide flow groove surfaces 4a and hydrogen guide flow groove surfaces 4b arranged on the front and back surfaces, and air inlet and outlet flow holes 5,5 ' and hydrogen inlet and outlet flow holes 2, 2 ' arranged at the two ends of the plate, and further comprises a cooling fluid guide channel 12 arranged between the air guide flow groove surfaces 4a and the hydrogen guide flow groove surfaces 4b, and cooling fluid inlet and outlet holes 6, 6 ' arranged at the two ends of the channel 12.
The cooling fluid guiding channel 12 comprises a reinforcing layer with a cooling fluid guiding function, the reinforcing layer is composed of two layers of thin steel sheets 10 and a plurality of separating strips 9 arranged between the two layers of thin steel sheets, the separating strips 9 are arranged along the longitudinal direction, a channel 11 for cooling fluid to pass through is formed between the two separating strips 9, and the upper end and the lower end of the channel 11 are respectively communicated with the cooling fluid inlet and outlet holes 6 and 6'.
The manufacturing method of the flow guide polar plate which can be used as the proton exchange membrane fuel cell comprises the following process steps:
the first step is as follows: manufacturing a reinforcing layer with a function of guiding cooling fluid, as shown in fig. 6, firstly taking two stainless steel sheets 10, then arranging a plurality of separating strips 9 between the two stainless steel sheets, wherein the separating strips 9 are longitudinally arranged, a fluid channel for cooling fluid to pass through is formed between every two separating strips, and the upper end and the lower end of the fluid channel are respectively communicated with a cooling fluid inlet and outlet hole (mold) 6, 6', so that the reinforcing layer with the function of guiding cooling fluid is formed; the reinforced layer is composed of two layers of very thin stainless steel sheets, a plurality of separating strips are arranged between the layers, the reinforced layer not only plays a role of supporting the two layers of stainless steel sheets, but also can enable cooling fluid to flow between the two layers of stainless steel sheets and flow according to zones between the separating strips without mutual flow channeling, and the areas of the divided zones divided by the two separating strips are approximately equal, so that the flowing flow of the cooling fluid in each divided zone can be ensured to be even and equal.
The second step is that: and manufacturing a flow guide bipolar plate, filling the uniformly mixed graphite powder and bonding resin filler into the front and back surfaces of the thin reinforcing layer with the flow guide and cooling fluid function obtained in the first step, and putting the reinforcing layer into a mould for one-time compression molding to obtain the flow guide bipolar plate. The flow-guiding bipolar plate is shown in fig. 5, the front and back surfaces of the flow-guiding bipolar plate are air flow-guiding groove surfaces and hydrogen flow-guiding groove surfaces, the upper and lower ends of the bipolar plate are respectively provided with six flow-guiding holes, which are hydrogen flow-guiding holes 2, 2 ', air flow-guiding holes 5,5 ', cooling fluid guiding holes 6, 6 ', wherein the middle flow-guiding hole 6, 6 ' is a cooling fluid guiding hole, cooling fluid, such as water, enters through the cooling fluid guiding hole 6, and flows along the double-layer interlayer dividing channel of the inner liner of the bipolar plate to flow back to the fluid guiding hole 6 '. The flow guiding bipolar plate of this example also has the features of the bipolar plate of example 1 described above.
Example3
Two thin soft graphite plates are placed on the reinforcing mesh or the reinforcing layer with the flow guide function in the embodiment 1 and the embodiment 2, and are placed in a mould for compression molding, and then resin is used for impregnation treatment and hardening to form the bipolar plate. The present embodiment also has the functions and features of the bipolar plates in the above embodiments 1 and 2.
Claims (6)
1. A can be used as the flow guiding polar plate of the fuel cell of proton exchange membrane, including setting up in the air guiding flow trough surface, hydrogen guiding flow trough surface of the front, reverse side, and setting up in the air flow hole of leading in and out, leading the hydrogen flow hole of leading in and out of both ends of the polar plate, characterized by that, also include setting up in leading the cooling fluid channel between air flow trough surface and hydrogen guiding flow trough surface of the above-mentioned air and leading the cooling fluid hole of leading in and out of both ends of the channel; the cooling fluid guide channel comprises a reinforcing net with a cooling fluid guide function, the longitudinal line of the reinforcing net is a hollow thin tube for guiding cooling fluid, the transverse line of the reinforcing net is a reinforcing strip for connecting each hollow thin tube, the thickness of the reinforcing strip is consistent with that of each hollow thin tube, and the upper end and the lower end of each hollow thin tube are respectively communicated with a cooling fluid inlet and outlet hole; or the cooling fluid guiding channel comprises a reinforcing layer with a cooling fluid guiding function, the reinforcing layer consists of two layers of thin steel sheets and at least two separating strips arranged between the two layers of thin steel sheets, the separating strips are longitudinally arranged, a channel for cooling fluid to pass through is formed between the two separating strips, and the upper end and the lower end of the channel are respectively communicated with the cooling fluid inlet and outlet holes.
2. A method for manufacturing a flow guide polar plate used as a proton exchange membrane fuel cell is characterized by comprising the following process steps:
(1) manufacture of reinforcing nets
Firstly, longitudinally arranging hollow thin tubes for guiding cooling fluid, respectively communicating the upper ends and the lower ends of the hollow thin tubes with cooling fluid inlet and outlet holes, transversely arranging reinforcing strips with the same thickness as the hollow thin tubes, and fixedly connecting the reinforcing strips with the hollow thin tubes to form a thin reinforcing net;
(2) compression molding
And (2) filling the evenly mixed graphite powder and bonding resin material into the front and back surfaces of the reinforcing mesh obtained in the step (1), and placing the reinforcing mesh into a die for compression molding to obtain the flow guide polar plate capable of being used as a proton exchange membrane fuel cell.
3. A method for manufacturing a flow guide polar plate used as a proton exchange membrane fuel cell is characterized by comprising the following process steps:
(1) making the reinforcing layer
Firstly, two thin steel sheets are taken, then at least two separating strips are arranged between the two thin steel sheets, the separating strips are arranged along the longitudinal direction, a fluid channel for cooling fluid to pass through is formed between every two separating strips, and the upper end and the lower end of the fluid channel are respectively communicated with a hole for leading in and out cooling fluid, so that a reinforcing layer with the function of leading the cooling fluid is formed;
(2) compression molding
And (2) filling the front and back surfaces of the reinforcing layer obtained in the step (1) with uniformly mixed graphite powder and bonding resin materials, and placing the reinforcing layer into a die for compression molding to obtain the flow guide polar plate capable of being used as a proton exchange membrane fuel cell.
4. The method as claimed in claim 2 or 3, wherein in the step (2), the graphite powder and the adhesive resin material are replaced by soft graphite plates as fillers on the front and back surfaces of the reinforcing mesh or layer.
5. The method as claimed in claim 2, wherein the hollow tubule is made of stainless steel tube or engineering plastic tube, and the reinforcing bar is made of solid stainless steel bar or engineering plastic bar.
6. The method as claimed in claim 3, wherein the thin steel sheet is thin stainless steel sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031290701A CN1320673C (en) | 2003-06-04 | 2003-06-04 | Guide polar plate for proton exchanging membrane fuel battery and producing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031290701A CN1320673C (en) | 2003-06-04 | 2003-06-04 | Guide polar plate for proton exchanging membrane fuel battery and producing method thereof |
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| Publication Number | Publication Date |
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| CN1553533A CN1553533A (en) | 2004-12-08 |
| CN1320673C true CN1320673C (en) | 2007-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031290701A Expired - Lifetime CN1320673C (en) | 2003-06-04 | 2003-06-04 | Guide polar plate for proton exchanging membrane fuel battery and producing method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5521018A (en) * | 1993-12-10 | 1996-05-28 | Ballard Power Systems Inc. | Embossed fluid flow field plate for electrochemical fuel cells |
| CN1255241A (en) * | 1996-10-02 | 2000-05-31 | 能量研究公司 | Improved bipolar plate separator |
| EP1009051A2 (en) * | 1998-12-08 | 2000-06-14 | General Motors Corporation | Liquid cooled bipolar plate consisting of glued plates for PEM fuel cells |
| CN1355573A (en) * | 2001-12-26 | 2002-06-26 | 天津大学 | Composite-layer bipolar plate of polymer-membrane fuel battery and its preparing process |
| CN1388598A (en) * | 2001-05-25 | 2003-01-01 | 北京飞驰绿能电源技术有限责任公司 | Making process of two plates of proton exchange film fuel cell |
-
2003
- 2003-06-04 CN CNB031290701A patent/CN1320673C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5521018A (en) * | 1993-12-10 | 1996-05-28 | Ballard Power Systems Inc. | Embossed fluid flow field plate for electrochemical fuel cells |
| CN1255241A (en) * | 1996-10-02 | 2000-05-31 | 能量研究公司 | Improved bipolar plate separator |
| EP1009051A2 (en) * | 1998-12-08 | 2000-06-14 | General Motors Corporation | Liquid cooled bipolar plate consisting of glued plates for PEM fuel cells |
| CN1388598A (en) * | 2001-05-25 | 2003-01-01 | 北京飞驰绿能电源技术有限责任公司 | Making process of two plates of proton exchange film fuel cell |
| CN1355573A (en) * | 2001-12-26 | 2002-06-26 | 天津大学 | Composite-layer bipolar plate of polymer-membrane fuel battery and its preparing process |
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| Publication number | Publication date |
|---|---|
| CN1553533A (en) | 2004-12-08 |
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