Products Description
The pure Titanium Bipolar Plate is composed of the plate and the flow field, which is the skeleton in the stack. The flow field is stacked with the membrane electrode to form the stack, which supports the fuel cell, collects the current, provides the channel for the coolant, separates the oxidant and reducing agent, and so on.
Because of its low density, high specific strength and excellent corrosion resistance in acidic environment, titanium has high application value in hydrogen fuel cell bipolar plates.
As an important part of PEMFC, the Pure titanium bipolar plate accounts for more than 70% of the weight of the stack, about 50% of the volume, and its cost is about 30% to 50% of the battery cost.Among them, the graphite bipolar plate has light weight, good corrosion resistance, excellent electrical and thermal conductivity, but it is brittle and the flow field processing cost is high. The composite bipolar plate has excellent formability and high mechanical strength, but poor electrical conductivity and high processing cost. In contrast, Pure titanium bipolar plate has thin thickness, excellent electrical and thermal conductivity, high mechanical strength and good gas isolation, which is conducive to the improvement of the specific power density of the battery. In addition, the processing technology of metal materials is mature, and the complex flow field with high precision can be processed by stamping, die casting and laser forming, etc., which is easy to achieve the quantitative production of the plate, and has become the mainstream bipolar plate material for hydrogen fuel cells.
At present, two important issues restricting the commercialization of hydrogen fuel cells are cost and durability, and the plate material, flow field processing and plate coating preparation process determine the cost of bipolar plates to a certain extent.
Graphite and carbon-based composites have been unable to meet the requirements of hydrogen fuel cells in terms of performance, and metal materials have become the mainstream materials of hydrogen fuel cell bipolar plates. In addition, high power has always been the pursuit goal of hydrogen fuel cells, titanium and titanium alloys in metal materials have low density, high specific strength, and excellent corrosion resistance in hydrogen fuel cells, which can significantly reduce the weight and volume of the bipolar plate, thus significantly improving the battery's mass specific power and volume specific power. Moreover, the corrosion products produced by titanium and titanium alloy during long-term service operation are less toxic to proton exchange modes and catalysts, which is conducive to improving the stability and durability of battery operation.
Pure Titanium Bipolar Plate as a choice to improve the service life and efficiency of hydrogen fuel cells, the volume and weight is much smaller than the graphite bipolar plate, the service life is greatly improved than the stainless steel bipolar plate, has been officially installed by a number of automobile companies. Our company has successfully passed the test of titanium bipolar plate surface modification and stamping process, welcome all hydrogen fuel cell reactor manufacturers and laboratories for consultation and cooperation.
Titanium and titanium alloys have high application value in hydrogen fuel cell bipolar plates because of their low density, high specific strength and excellent corrosion resistance in acidic environment. The research progress of titanium bipolar plates for hydrogen fuel cells in recent years is reviewed, and the research achievements of surface modification technology of Pure titanium bipolar plateare described in detail, including doping alloying elements, coating metal based coatings (precious metals, metal carbon/nitride, etc.) and carbon based coatings (graphite, amorphous carbon, etc.). The composite and nano structure of the coating are conducive to improving the corrosion resistance, electrical conductivity and hydrophobicity of the titanium bipolar plate, which plays an important role in improving the performance of hydrogen fuel cells and ensuring the stability and durability of its operation.
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