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Alloy metal bipolar plate for proton exchange membrane fuel cell and preparation method

A technology of metal bipolar plates and proton exchange membranes, which is applied to fuel cell components, fuel cells, circuits, etc., can solve the problems of reduced corrosion current, high preparation costs, and high product costs, and achieve good oxidation resistance and durability Corrosivity, simplify the preparation process, reduce the effect of equipment investment

Active Publication Date: 2021-12-03
深圳金恒辉新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yet this invention does not provide the data of the durability test of pole plate, and carbide and even nitride often can not provide good durability because of oxidation; In addition, the technical means that the present invention uses needs to use expensive equipment, can cause product the problem of high cost;
[0006] Chinese invention patent application CN112909281A discloses a metal bipolar plate based on a thin stainless steel plate and its preparation method. In order to solve the corrosion resistance problem of the stainless steel plate, the invention adopts magnetron sputtering technology to coat a layer containing A transition layer of tungsten, molybdenum, etc., and then use magnetron sputtering technology to build a layer of mixed nitride or carbide (MAX layer) of two or more transition metals on the transition layer. According to the application documents, the conductivity of the plate The corrosion current is greatly improved, and the corrosion current is significantly reduced; however, this invention also requires the use of expensive magnetron sputtering equipment. At the same time, carbonitride coating is the current mainstream technology, and its bonding force and durability are not ideal
[0007] Constructing a corrosion-resistant coating on a metal plate is a very difficult task, often requiring expensive special equipment and raw materials, and the preparation cost is usually high, resulting in high cost of metal bipolar plates
More importantly, corrosion-resistant coatings often have problems such as poor conductivity, weak binding force, and poor durability; the fuel cell stacks assembled with metal bipolar plates generally have insufficient durability.

Method used

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  • Alloy metal bipolar plate for proton exchange membrane fuel cell and preparation method
  • Alloy metal bipolar plate for proton exchange membrane fuel cell and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0037] see figure 1 , an alloy metal bipolar plate for proton exchange membrane fuel cells, without the need to make a special corrosion-resistant coating, only need to carry out a simple surface treatment to obtain no special surface layer, or have a self-generated thin layer of nitrogen Compound layer, carbide layer. The material of the base of the bipolar plate is an alloy material thin plate with good corrosion resistance (chemical corrosion and electrochemical corrosion) and oxidation resistance, and its thickness is 0.1-0.33mm. The surface layer formed by the surface treatment usually has a thickness of 10-50 nanometers.

[0038] The preparation method comprises the following steps:

[0039] (1) Ti-Mo alloy plate (containing 32% Mo) with a thickness of 0.1mm, use a punching die to punch out the size, shape and opening, etc., and then use a flow field die to punch out the required flow field; obtain a bipolar plate The anode sheet and the cathode sheet; the anode side ...

Embodiment 2

[0046] Except for the following changes, other operations were the same as in Example 1.

[0047] (1) adopt the Ti-Pd alloy plate (containing Pd 0.2wt%) of 0.2mm thickness to replace the Ti-Mo alloy plate of embodiment 1;

[0048] (2) The post-treatment of the plate is carried out under a nitrogen atmosphere containing ammonia; the treatment temperature is changed to 300 degrees Celsius.

[0049] The contact resistivity of the prepared plate is 3.25mΩcm 2 (140N / cm 2 ) The corrosion current density is 4.2*10 -4 mA / cm 2 .

Embodiment 3

[0051] Except that Ti-Nb (Nb content 12wt%) alloy plate with a thickness of 0.1 mm was used instead of the Ti-Mo alloy plate in Example 1, other operations were the same as in Example 1.

[0052] The contact resistivity of the prepared plate is 3.65mΩcm 2 (140N / cm 2 ) The corrosion current density is 6.6*10 -4 mA / cm 2 .

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Abstract

The invention discloses a low-cost alloy metal bipolar plate for a fuel cell and a preparation method. The metal bipolar plate is formed by molding, welding and simple post-treatment of a corrosion-resistant alloy material with good conductivity, and the alloy bipolar plate does not need to be specially manufactured with a conductive corrosion-resistant coating or only needs simple surface post-treatment, and thus, the production cost of the metal polar plate can be greatly reduced. The polar plate is high in conductivity and good in corrosion resistance, and can meet the durability requirement of the proton exchange membrane fuel cell on the metal polar plate.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to an alloy metal bipolar plate used in a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell is a device that can directly, efficiently and environmentally friendly convert the chemical energy of fuel into electrical energy. It has very important application prospects in transportation (automobiles, ships, etc.), communications, military and other fields. The use of high-performance metal bipolar plates can greatly increase the volume power density and mass power density of the fuel cell stack, making the fuel cell have higher application value and application economy. Metal bipolar plate technology is one of the next-generation fuel cell technologies that countries around the world are competing to develop. [0003] As a bipolar plate, good electrical conductivity and thermal conductivity are the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0208H01M8/0228
CPCH01M8/0208H01M8/0228Y02E60/50Y02P70/50
Inventor 廖世军文兆辉
Owner 深圳金恒辉新材料有限公司