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Production method of corrosion-resistant high-conductivity fuel cell metal bipolar plate

A technology of metal bipolar plates and production methods, which is applied to fuel cell parts, fuel cells, electrochemical generators, etc., can solve the problems of no manufacturing method angle, cumbersome process, low production capacity, etc., and achieve accelerated industrialization process, shorten the process flow, and improve the effect of durability

Active Publication Date: 2019-05-17
SHANGHAI ZHIZHEN NEW ENERGY EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods and material preparation require high coverage of the bipolar plate surface, dense film layer and certain mechanical strength, high requirements for cleaning before coating, high equipment cost, low production capacity, and do not use the resistance of the passivation film of the substrate itself. Corrosive, complex coating process, no optimization of bipolar plate manufacturing from the perspective of manufacturing methods
[0004] In addition, the current manufacturing method of corrosion-resistant high-conductivity bipolar plates requires stamping and forming of metal substrates, cleaning and welding into bipolar plates; therefore, corrosion-resistant conductive coatings still need to be cleaned before coating Film layer modification (CN106129422A method for improving the compactness and corrosion resistance of bipolar plate surface coating), the process is cumbersome, the requirements for cleaning before coating are harsh, the equipment requirements are high, the production efficiency is low, and the production capacity is low, which is not conducive to large-scale production and cost reduction of

Method used

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  • Production method of corrosion-resistant high-conductivity fuel cell metal bipolar plate
  • Production method of corrosion-resistant high-conductivity fuel cell metal bipolar plate
  • Production method of corrosion-resistant high-conductivity fuel cell metal bipolar plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A 316L stainless steel substrate with a certain corrosion resistance and uniform thickness was selected, and the stainless steel substrate was ultrasonically cleaned in ethanol and water to remove surface grease and surface debris. Fix the stainless steel substrate on the hanger, transport it to the working position through the transmission guide rail, then close the reaction chamber, and the pumping system starts to vacuum; when the vacuum is pumped to 1Pa, the heater will heat; when the heating temperature reaches the required temperature , keep warm for a period of time, and then pass the reaction gas into the cavity through the gas circuit and air holes, and control the vacuum degree required by the process through the pumping system; Reactive gas; control the reaction time, when the deposited carbon thickness meets the requirements, turn off the RF power supply of the RF electrode, and deposit a speckle-shaped conductive material with a diameter of 1-2500nm and a th...

Embodiment 2

[0030] Select a titanium plate with good corrosion resistance and uniform thickness, and ultrasonically clean the titanium plate in ethanol and water respectively to remove surface grease and surface debris. Fix the titanium plate on the hanger, transport it to the working position through the transmission guide rail, then close the reaction chamber, and the exhaust system starts to vacuum; when the vacuum reaches 4Pa, the heater will heat; when the heating temperature reaches the required temperature , keep warm for a period of time, then pass plasma gas into the cavity through the gas circuit and air holes, and control the vacuum degree required by the process through the pumping system; when the cavity pressure is stable, adjust the power of the arc to match the powder supply speed, adjust The spraying distance and spraying angle ensure that the powder is evenly coated on the substrate, and the relative movement speed between the spray gun and the workpiece is controlled. Wh...

Embodiment 3

[0033] A titanium plate with good corrosion resistance and uniform thickness was selected, and the titanium substrate was ultrasonically cleaned in ethanol and water to remove surface grease and surface debris. Fix the titanium plate on the hanger, spray metal particles and nano-gold onto the surface of the titanium plate by thermal spraying, control the reaction time for 5-10 minutes, and spray the speed of 0.5m min -1， To 5m min-1, the nano-gold particles sprayed on the surface of the titanium plate have a diameter of 2.5-2500nm, a thickness of 550-2500nm, and a speckle-like gold spot with a coverage rate of 5%. Integrate into one, and finally form a bipolar plate through external packaging.

[0034] Performance test: The contact resistance test is carried out on the sample. When the surface density of the nano-gold powder particles reaches about 5%, the contact resistance is 3.37mΩ·cm under the pressure of 0.6Mpa 2 , has reached less than 10mΩ·cm 2 application standards. ...

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Abstract

The invention discloses a production method of a corrosion-resistant high-conductivity fuel cell metal bipolar plate. The production method includes the following steps: (1) attaching a conductive material to a metal substrate in the form of spots to obtain a metal substrate A with conductive spots, and then fusing the conductive spots with the metal substrate A into a whole to obtain a metal substrate B; and (2) mechanically punching and forming the metal substrate B to obtain a metal unipolar plate with a flow channel, and bonding the metal unipolar plate to obtain the metal bipolar plate ofthe invention. According to the scheme of the invention, a subsequent surface coating process is not required, the process flow of the fuel cell metal polar plate is shortened, the manufacturing rateof the metal bipolar plate is improved, and the manufacturing cost is reduced; and meanwhile, the corrosion resistance of the substrates and the surface conductivity are fully utilized, the dependence on the surface modification of the metal polar plate is reduced, and the durability in the fuel cell environment can be significantly improved. The method for preparing the fuel cell metal bipolar plate is simple in process and low in cost.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a method for manufacturing a corrosion-resistant high-conductivity fuel cell metal bipolar plate. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) is an energy conversion device that directly converts the chemical energy of hydrogen into electrical energy by electrochemical means. The conversion efficiency is not limited by the Carnot cycle, and the conversion efficiency can reach 50%. At the same time, it also has the advantages of low noise, low power generation efficiency affected by load changes, and environmental friendliness. It is an ideal mobile power supply and independent power supply device. It is expected to replace conventional engines as the main power source for future cars, and can be applied to electronic products, Aerospace, fixed power stations and many other fields. [0003] The fuel cell metal bipolar plate (hereinafter referred to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0206H01M8/0213H01M8/0228
CPCY02P70/50Y02E60/50
Inventor 徐一凡梅昊毕飞飞姜天豪蓝树槐彭林法
Owner SHANGHAI ZHIZHEN NEW ENERGY EQUIP CO LTD
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