CN101143395A - Stainless steel dual-polar plate welding method - Google Patents
Stainless steel dual-polar plate welding method Download PDFInfo
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- CN101143395A CN101143395A CNA2007101578150A CN200710157815A CN101143395A CN 101143395 A CN101143395 A CN 101143395A CN A2007101578150 A CNA2007101578150 A CN A2007101578150A CN 200710157815 A CN200710157815 A CN 200710157815A CN 101143395 A CN101143395 A CN 101143395A
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- polar plate
- bipolar plates
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Abstract
A method of welding a stainless two-polar plate comprises following steps: low-melting alloy solder is coated on a compressed positive plate that is provide with a flow field, a channel for pass-in-and-out gas and a channel for refrigerant and one side of the refrigerant of the negative plate which needs to be welded; the coated surface is cleaned; two surfaces of the positive plate and the negative plate coated with the solder that contact with each other are overlapped and put into the flat-bed press to have hot press for 1 to 8 minutes under the temperature of 150 to 180 DEG C and the pressures of 0.5 to 1 MPa; and then the radiating medium is added into the radiating channel of the flat-bed press; the temperature of the flat-bed press is reduced to 20 to 25 DEG C; the two-polar plate is taken out to be cooled until the temperature of the two-polar plate reaches the room temperature; after being welded, air tightness of the two-polar plate is tested to ensure that the finished two-polar plate does not have water or gas leakage. The invention has an advantage that the two-polar plate has simple welding technology and the manufactured twp-polar plate that has good planeness, high strength and uniform performance does not become deformed.
Description
Technical field
The invention belongs to fuel cell technology, relate in particular to the manufacturing technology of dual polar plates of proton exchange membrane fuel cell.
Background technology
Fuel cell (FC) is a kind of electrochemical TRT, and it presses electrochemical principle, and the chemical energy that isothermal ground will be stored in fuel and the oxidant is converted into electric energy.Have superiority such as energy conversion efficiency height, environmental friendliness, peace and quiet, reliability height, be considered to the cleaning of 21 century first-selection, generation technology efficiently.
Proton Exchange Membrane Fuel Cells (PEMFC) except that general characteristic with fuel cell, also have simultaneously can start fast in room temperature, no electrolyte loss, water are easily discharged, the life-span long, specific power and the high outstanding characteristics of specific energy.Therefore, it is not only applicable to the terrestrial power generation station, is suitable for especially as removable power source, portable power supplies yet, and be electric motor car and do not rely on air to advance one of ideal candidates power supply of submarine, still be the family power source of following hydrogen energy era the best.
The voltage of Proton Exchange Membrane Fuel Cells (PEMFC) monocell is very low, and (0.6～0.7V), in order to obtain useful electric current and voltage, need be together in series a plurality of monocells constitutes a battery pile.The dividing plate of cutting apart adjacent two monocells is a bipolar plates.Bipolar plates is a multifunctional module of Proton Exchange Membrane Fuel Cells (PEMFC), its basic role be to fuel cell electrode reactant is provided and for battery pile in adjacent cell electrical connection is provided, discharge product water and reaction heat simultaneously in the battery.Good bipolar plates must satisfy many materials and structural requirement, according to Mepeted GO, Moore JM, Performance and durability of bipolarplate material[B], handbook of fuel cell 2003, Vol3, described in 286～293, bipolar plates should possess following fundamental characteristics:
1, has good electrical conductivity (〉=l0scm
-1);
2, has good the thermal conductivity factor (〉=20Wcm of getting
-1K
-1);
3, good air-tightness (＜10
-4Mbarcm
3s
-1Cm
-2);
4, corrosion-resistant under the condition of acid aqueous vapor, oxygen and heat;
5, volume is little in light weight;
6, material is cheap and processing cost is low.
In the prior art, bipolar plates can be made by graphite, polymer and materials such as graphite powder, metal.
The bipolar plates that the graphite material material is made, because graphite has good electrical conductivity, the superior corrosion resistance energy, density is also very low, is the preferred material of traditional Proton Exchange Membrane Fuel Cells (PEMFC) bipolar plates.Its weak point is: because the graphite mechanical strength is low, flexibility is bad, causes graphite bi-polar plate thicker, and machined flow field length consuming time, and cost is excessive, can't satisfy the extensive cheap requirement of producing of Proton Exchange Membrane Fuel Cells (PEMFC) commercialization.
Utilize polymer and graphite powder (or carbon dust) to be mixed with another selection that composite dual-electrode plates is a Proton Exchange Membrane Fuel Cells (PEMFC), it has advantages such as low, the in light weight and easy production of cost.Gas distribution channel can adopt modes such as vacuum or compression directly to process on bipolar plates, does not need machining.The characteristic of composite dual-electrode plates depends primarily on the ratio of graphite powder and polymer and the kind of polymer.Although a large amount of patent documentations about the preparation composite dual-electrode plates is arranged,, also there is not business-like cheap products to sell at present, its main cause is that the mould of the composite dual-electrode plates of preparation band gas flowfield costs an arm and a leg, the demoulding difficulty, yield rate is low, causes composite dual-electrode plates to cost an arm and a leg.
Metal has favorable conductive, thermal conduction characteristic and pliability, also is the optional material of Proton Exchange Membrane Fuel Cells (PEMFC) bipolar plates, comprises with stainless steel, aluminium and titanium plate etc. as Proton Exchange Membrane Fuel Cells (PEMFC) bipolar plates.In order to reduce the weight of bipolar plates, common employing thickness is the thin plate about 0.1mm when making bipolar plates with stainless steel, makes anode flow field board and cathode flow field plate respectively, then, anode flow field board and cathode flow field plate are welded or bond together, and heat removal fluid is walked in the centre.The deficiencies in the prior art are: when taking adhering method, bonding agent is macromolecular material normally, in the ethylene glycol equal solvent swelling can take place, and loses cementation, and cooling agent just can not adopt organic solvent like this, has limited the cryogenic applications of fuel cell; When adopting welding method, adopt Laser Welding, electric resistance welding or soldering usually.Laser Welding or electric resistance welding temperature height easily cause the bipolar plates distortion, and the corrosion easily again of laser solder joint; Corrosion material in the brazing solder remains in the coolant cavity of bipolar plates, is difficult to remove totally, causes the bipolar plates corrosion.
Summary of the invention
The objective of the invention is to propose a kind of new stainless steel dual-polar plate welding method, the solder-coating of welding process and reflow process are separated, independent optimization, under far below the temperature that causes stainless sheet steel generation moderate finite deformation, anode unipolar plate and negative electrode unipolar plate are welded together, constitute bipolar plates.Technology side of the present invention decides on a verdict and is: a kind of stainless steel dual-polar plate welding method is characterized in that described stainless steel dual-polar plate welding method may further comprise the steps:
The position that the anode unipolar plate that has flow field and turnover gas and coolant channel that 1, will suppress and cooling agent one side of negative electrode unipolar plate need be welded is coated with and applies the low-melting alloy scolder that fusing point is a 150-180 degree Celsius, thickness is the 40-60 micron, cleans up applicator surface after the coating;
2, being coated with anode unipolar plate and the negative electrode unipolar plate that applies the low-melting alloy scolder, to there be the face of scolder to contact, be stacked together, put into flat-bed press, under 150-180 degree solder fusing temperature Celsius and 0.5-1MPa pressure, hot pressing 1-8 minute, in the heat dissipation channel of hot press, feed heat eliminating medium subsequently, the hot press temperature is reduced 20-25 degree Celsius, open hot press, take out bipolar plates, naturally cool to room temperature;
3, detect the air-tightness of the bipolar plates after welding, reach air tight, watertight bipolar plates and be the finished product bipolar plates.
A kind of stainless steel dual-polar plate welding method of the present invention is characterized in that described low-melting alloy scolder in the position coating that cooling agent one side of unipolar plate need be welded is a wiping solder.
A kind of stainless steel dual-polar plate welding method of the present invention is characterized in that described coating method at position that cooling agent one side of unipolar plate need be welded coating low-melting alloy scolder is with scolder heating coating or electroplates a kind of in the coating method.
Advantage of the present invention is that the welding procedure of bipolar plates is simple, and the bipolar plates that makes is indeformable, smooth, intensity is good, the performance homogeneous of bipolar plates.
The specific embodiment
The flow field that has that suppresses is gone up wiping solder with the position that cooling agent one side of anode unipolar plate that passes in and out gas and coolant channel and negative electrode unipolar plate need be welded with the electro-plating method coating, and thickness is 50 microns, cleans up applicator surface after the coating; Then, the anode unipolar plate that has scolder and each a slice of negative electrode unipolar plate, will there be the face of scolder to be in contact with one another, be stacked together, put into flat-bed press, under 150-180 degree solder fusing temperature Celsius and 0.5-1MPa pressure, hot pressing 4 minutes feeds water and air subsequently in the heat dissipation channel of hot press, the hot press temperature is reduced by 25 degree Celsius, open hot press, take out bipolar plates, naturally cool to room temperature.Then, detect the air-tightness of the bipolar plates after welding, reach air tight, the water-tight finished product bipolar plates that is.
Claims (3)
1. stainless steel dual-polar plate welding method is characterized in that described stainless steel dual-polar plate welding method may further comprise the steps:
The position that the anode unipolar plate that has flow field and turnover gas and coolant channel that 1) will suppress and cooling agent one side of negative electrode unipolar plate need be welded is coated with and applies the low-melting alloy scolder that fusing point is a 150-180 degree Celsius, thickness is the 40-60 micron, cleans up applicator surface after the coating;
2) being coated with anode unipolar plate and the negative electrode unipolar plate that applies the low-melting alloy scolder, to there be the face of scolder to be in contact with one another, be stacked together, put into flat-bed press, under 150-180 degree solder fusing temperature Celsius and 0.5-1MPa pressure, hot pressing 1-8 minute, in the heat dissipation channel of hot press, feed heat eliminating medium subsequently, the hot press temperature is reduced 20-25 degree Celsius, open hot press, take out bipolar plates, naturally cool to room temperature;
3) air-tightness of the bipolar plates after the detection welding reaches air tight, watertight bipolar plates and is the finished product bipolar plates.
2. a kind of stainless steel dual-polar plate welding method according to claim 1 is characterized in that described low-melting alloy scolder in the position coating that cooling agent one side of unipolar plate need be welded is a wiping solder.
3. a kind of stainless steel dual-polar plate welding method according to claim 1 is characterized in that described coating method at position that cooling agent one side of unipolar plate need be welded coating low-melting alloy scolder is with scolder heating coating or electroplates a kind of in the coating method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101578150A CN100463752C (en) | 2007-10-29 | 2007-10-29 | Stainless steel dual-polar plate welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101578150A CN100463752C (en) | 2007-10-29 | 2007-10-29 | Stainless steel dual-polar plate welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101143395A true CN101143395A (en) | 2008-03-19 |
| CN100463752C CN100463752C (en) | 2009-02-25 |
Family
ID=39206224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101578150A Expired - Fee Related CN100463752C (en) | 2007-10-29 | 2007-10-29 | Stainless steel dual-polar plate welding method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108225867A (en) * | 2018-02-06 | 2018-06-29 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | The plate film-making component and device of corrosion test applied to flux residue |
| CN109623191A (en) * | 2019-01-14 | 2019-04-16 | 安徽明天氢能科技股份有限公司 | A kind of fuel battery double plates welding production technology |
| CN110732797A (en) * | 2019-10-25 | 2020-01-31 | 国网四川省电力公司电力科学研究院 | aluminum polar plate welding method for integral calibration of power frequency electric field measuring instrument |
| CN111318803A (en) * | 2020-02-20 | 2020-06-23 | 浙江锋源氢能科技有限公司 | Heat dissipation device and welding method of metal bipolar plate |
| CN111446463A (en) * | 2020-03-06 | 2020-07-24 | 浙江中合天空科技股份有限公司 | Industrial production process of flexible carbon-based bipolar plate of fuel cell |
| DE202021104930U1 (en) | 2021-09-13 | 2021-09-21 | GLAMAtronic Schweiß- und Anlagentechnik GmbH | Device for resistance welding of thin metal foils as well as a control / regulating unit and computer program product for it, as well as a correspondingly produced metal foil arrangement |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10040499C2 (en) * | 2000-08-18 | 2002-06-27 | Forschungszentrum Juelich Gmbh | Contact layer and a fuel cell comprising such a contact layer |
| US6887610B2 (en) * | 2003-01-21 | 2005-05-03 | General Motors Corporation | Joining of bipolar plates in proton exchange membrane fuel cell stacks |
| CN100349315C (en) * | 2004-12-08 | 2007-11-14 | 中国科学院金属研究所 | Method for surface treating stainless steel double polar plate of proton exchanging film fuel cell |
| DE102005009307A1 (en) * | 2005-03-01 | 2006-09-07 | Bayerische Motoren Werke Ag | Solid oxide fuel cell production involves soldering ceramic electrolyte layer to the electrode layer at a temperature that simultaneously sinters the electrode layer to the bipolar plate |
| CN100371121C (en) * | 2005-04-06 | 2008-02-27 | 吉欣（英德）热轧不锈复合钢有限公司 | Processing method of press forming soldering high rolling composite blank |
-
2007
- 2007-10-29 CN CNB2007101578150A patent/CN100463752C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108225867A (en) * | 2018-02-06 | 2018-06-29 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | The plate film-making component and device of corrosion test applied to flux residue |
| CN109623191A (en) * | 2019-01-14 | 2019-04-16 | 安徽明天氢能科技股份有限公司 | A kind of fuel battery double plates welding production technology |
| CN110732797A (en) * | 2019-10-25 | 2020-01-31 | 国网四川省电力公司电力科学研究院 | aluminum polar plate welding method for integral calibration of power frequency electric field measuring instrument |
| CN111318803A (en) * | 2020-02-20 | 2020-06-23 | 浙江锋源氢能科技有限公司 | Heat dissipation device and welding method of metal bipolar plate |
| CN111318803B (en) * | 2020-02-20 | 2022-05-24 | 浙江锋源氢能科技有限公司 | Heat dissipation device and welding method of metal bipolar plate |
| CN111446463A (en) * | 2020-03-06 | 2020-07-24 | 浙江中合天空科技股份有限公司 | Industrial production process of flexible carbon-based bipolar plate of fuel cell |
| CN111446463B (en) * | 2020-03-06 | 2021-11-12 | 浙江中合天空科技股份有限公司 | Industrial production process of flexible carbon-based bipolar plate of fuel cell |
| DE202021104930U1 (en) | 2021-09-13 | 2021-09-21 | GLAMAtronic Schweiß- und Anlagentechnik GmbH | Device for resistance welding of thin metal foils as well as a control / regulating unit and computer program product for it, as well as a correspondingly produced metal foil arrangement |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100463752C (en) | 2009-02-25 |
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Granted publication date: 20090225 Termination date: 20111029 |