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Preparation method and application of bipolar plate

A bipolar plate and unipolar plate technology, applied in the field of bipolar plate preparation, can solve the problems of high electrical conductivity and high thermal conductivity, and achieve the effects of high electrical conductivity, excellent mechanical strength, and good performance results

Inactive Publication Date: 2019-06-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the main problem of graphite / polymer composite bipolar plates is that high electrical and thermal conductivity requires high graphite content, while high air tightness and suitable mechanical strength require high resin content, so it is difficult to simultaneously Meet the requirements for high electrical conductivity and high mechanical strength of bipolar plate materials

Method used

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  • Preparation method and application of bipolar plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Mix 79.7% graphite powder, 20% polypropylene polymer, and 0.3% calcium stearate evenly, and then evenly distribute them in the hot-pressing mold. The hot-pressing mold is a mold with runners. Under pressure, gradually increase the temperature to 160°C, then gradually increase the pressure to 40MPa, continue to raise the temperature to 230°C, keep the pressure at 230°C for 1min, then cool down, release the pressure after the temperature drops to 80°C, open the mold, and demould successfully , take out the plate. Cut 3 strips of 4cm×1cm from different positions on the plate, use the four-probe method to measure the horizontal conductivity of the plate, and finally take the average value of the 3 pieces to measure the area specific resistance of the unipolar plate 22mΩ·cm 2 ;Cut four samples of 4cm×4cm size from different positions on the pole plate, and use the four-electrode method to characterize the vertical conductivity of the pole plate at 1000psi. The average valu...

Embodiment 2

[0057] Mix 80% of high-conductivity carbon black, 15% of polyethylene terephthalate, 4.5% of carbon nanotubes and 0.5% of zinc stearate, and spread them evenly in the hot pressing mold, first at 10MPa Under the pre-compression pressure, gradually increase the temperature to 150°C, then increase the pressure to 45MPa, continue to raise the temperature to 250°C, keep the pressure at 250°C for 3 minutes, then cool down, release the pressure after the temperature drops to 70°C, open the mold, and successfully release mold, take out the plate. Using the same method as in Example 1 to characterize the prepared pole plate, the measured area specific resistance of the monopolar plate is 23mΩ cm 2 , the vertical conductivity is 42S / cm; the flexural strength measured by the three-point method is 63MPa.

Embodiment 3

[0059] Mix 85% graphite powder, 13% polyphenylene sulfide polymer and 2% ground carbon nanofiber evenly, and then evenly distribute them in the hot-pressing mold. At first, a layer of flake graphite powder is evenly spread on the bottom of the mold, and the raw materials are placed After being inside the mold, sprinkle a layer of flake graphite powder evenly on the surface, and then close the mold, first gradually increase the temperature to 200°C under the pre-compression pressure of 10MPa, then gradually pressurize to 40MPa, continue to heat up to 370°C, 370°C Keep the pressure at ℃ for 30s, and then cool down. After the temperature drops to 150℃, open the mold, demould successfully, and take out the polar plate. Using the same method as in Example 1 to characterize the prepared polar plate, the measured area specific resistance of the unipolar plate is 17mΩ cm 2 , the vertical conductivity is 47S / cm; the flexural strength measured by the three-point method is 66MPa.

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Abstract

The invention provides a preparation method of a bipolar plate. The preparation method comprises the steps of preparing raw materials, preparing a monopole plate through a mold hot-pressing method andpreparing the bipolar plate through gluing. The prepared bipolar plate comprises an anode plate, a cathode plate and a cooling channel formed by bonding the anode plate and the cathode plate, by reasonably controlling the content of the polymer and reasonably optimizing the hot-pressing preparation process conditions, the high conductivity and excellent mechanical strength of the bipolar plate are ensured, and by adjusting the technological parameters of blade coating, brush coating, silk-screen printing or dispensing, the good sealing of the polar plate is realized, and a cooling flow channel is ensured. The prepared bipolar plate is applied to a proton exchange membrane fuel cell, and a good performance result is obtained.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a preparation method and application of a bipolar plate. Background technique [0002] The fuel cell stack bipolar plate (hereinafter referred to as "bipolar plate") is one of the key components of the fuel cell stack system. In the fuel cell stack, the bipolar plate is not only responsible for distributing fuel gas and air, but also realizing the The electrical connection and current collection between the batteries are also responsible for taking out waste heat from the active area and preventing the leakage of gas and coolant. [0003] Graphite has the advantages of excellent corrosion resistance, low density, and low contact resistance with electrode support materials. The most widely used bipolar plate is the traditional graphite plate. Its preparation method is mainly that graphite powder is added with binder, after kneading and molding, it is carbonized and graphitize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0223H01M8/0267
CPCY02E60/50
Inventor 杨林林李印华孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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