Fuel cell bi-polar plate with compound sealed structure and manufacturing method thereof

Abstract

The invention relates to a fuel cell bi-polar plate with a compound sealed structure and a manufacturing method thereof. An air flow-field sealing element and a hydrogen flow-field sealing element are directly solidified and formed on seal groove surfaces of a cathode plate and an anode plate; a water flow-field sealing element is adhered with the cathode plate and the anode plate into an integer to form the bi-polar plate with the compound sealed structure; and the air flow-field sealing element, the water flow-field sealing element and the hydrogen flow-field sealing element are solidified to be formed on the surfaces of the cathode plate and the anode plate so as to form a molecule binding force sealing layer. The manufacturing method comprises the following steps of: completely processing a boundary dimension, a fluid passage and a fluid distribution passage to obtain the cathode plate and the anode plate by using graphite or metal as forming materials; processing an elastic sealing structure with a retardant function through a sealant coating process in an air seal groove and a hydrogen seal groove of the cathode plate and the anode plate by using a high-temperature solidifying sealant; then carrying out high-temperature solidification to obtain a single-polar plate with the compound sealed structure, and coating the sealant in a water flow-field seal groove of the single-polar plate with the compound sealed structure; and then manufacturing the fuel cell bi-polar plate with the compound sealed structure by pressing the cathode plate and the anode plate to carry out solidification through a press mould.

Description

technical field [0001] The invention relates to a fuel cell and a manufacturing method thereof, in particular to a fuel cell bipolar plate with an integral composite sealed structure and a manufacturing method thereof. Background technique [0002] With the rapid development of science and technology and the continuous improvement of people's living standards, correspondingly, traditional fossil energy (such as oil, natural gas, etc.) has become increasingly unable to meet the needs of human daily production and life. As we all know, traditional energy is mostly non-renewable energy, which will be exhausted sooner or later, and this kind of energy will cause serious global environmental pollution problems. For the sustainable development of the earth and human society, all countries in the world are committed to finding a renewable clean energy. At present, scientists agree that "hydrogen energy" is one of the effective and clean energy sources to replace traditional energy...

AI Technical Summary

Problems solved by technology

This method is suitable for mass production of sealing gaskets for fuel cells, but the method fails to realize the direct molding of the sealing ring on the pole plate, and the pole plate formed by this method is more complicated in assembly, and must be assembled with a cathode plate, A piece of anode plate and a piece of membrane electrode are stacked in sequence, and a separately formed sealing ring needs to be placed between each unit to seal

This method is not only complicated in process and heavy in workload, but also complicated to disassemble and maintain the stack; and because the sealing ring is originally independent, as shown in Figure 2, the sealing is completely achieved by pressing force after assembly. There will be gaps between the contact surfaces 8, and the airtightness is not ideal, resulting in hydrogen leakage

In addition, the production of sealing gaskets requires the development of molds, and the initial development costs are high

[0007] Shanghai Shenli Technology Co., Ltd. discloses a fuel cell sealing assembly structure in Chinese patent: ZL200610030850, the sealant is stuck in the sealing groove of the hydrogen-conducting anode surface of the flow-guiding plate or bipolar plate, and its The essence is still a unipolar plate, and the fuel cell bipolar plate unit structure has not been formed, the assembly is complicated and the airtightness is still unreliable

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