Reinforced Gaskets for Fuel Cells

Abstract

The enhanced sealing gasket for the fuel cell of the present invention is mainly used for the sealing between various fluids in the fuel cell, so that the fluids are strictly isolated, so as to ensure that the various fluids inside the fuel cell can be strictly in their respective channels, flow in the flow field. The enhanced sealing gasket for the fuel cell of the present invention mainly improves the sealing reliability and the ability to resist the failure of the sealing structure by improving the structure of the gasket, and utilizes two enhanced sealing gaskets used in pairs in the fuel cell The cooperation further improves the reliability of the seal. The structure of the reinforced sealing gasket for fuel cells in the present invention mainly includes a sealing base and a plurality of sealing bosses arranged on the sealing base and perpendicular to the axial direction of the cross section of the gasket.

Description

technical field [0001] The invention applies to the technical field of fuel cells, and in particular relates to a sealing gasket used in fuel cells. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a power generation device that uses fuel gas and oxidant gas to convert chemical energy into electrical energy efficiently through electrochemical reactions on membrane electrodes. Since the product of the fuel cell is water, its working process has achieved zero pollution to the environment. It is recognized as a zero-emission green energy conversion device and one of the power devices with the most development potential in the new century. Proton exchange membrane fuel cells are widely used, ranging from portable power sources of a few watts to vehicle power sources of hundreds of kilowatts. Fuel cells can meet our electrical energy needs in many aspects. [0003] When the fuel cell is working, it needs fuel gas and oxidant gas to participate in the e...

AI Technical Summary

Problems solved by technology

For example, the gasket used in the fuel cell proposed by Toyota Motor Corporation (China Patent Application No.: 201480053102.8) is a gasket that combines the line seal and the surface seal. Although the gasket combines the stability of the surface seal and The wire seal has a better sealing effect, but it cannot overcome the contradiction between the high compression ratio of the wire seal, the high pressure and the weak structure of the wire seal. The wire seal structure part tends to have a rebound elasticity that deteriorates earlier than the surface seal structure part during use. Problems, even due to factors such as processing errors or excessive assembly pre-tightening force, the wire seal structure part is over-compressed and crushed during assembly and use.

The sealing structure of the fuel cell developed by NOK Corporation (Chinese patent application number: 201480029887.5) solves the problem of excessive deformation of the sealing gasket combined with the line seal and the surface seal by adding a limit structure, but this method increases the processing cost. At the same time, higher requirements are put forward for the accuracy of assembly

Another fuel cell sealing structure proposed by NOK Co., Ltd. (Chinese patent application number: 201080022024.7) has the problem of the sealing structure proposed by Toyota Motor Corporation mentioned above. The combination of sealing gaskets not only requires higher assembly accuracy, but also for fuel cell components with low rigidity, such as membrane electrodes, the line sealing parts will push each other during subsequent use and be pushed to deviate from the set position. The phenomenon of the sealing position reduces the sealing effect; what's more, when the sealing gaskets are pushed and staggered from each other, it will cause excessive bending and deformation of the corresponding parts of the membrane electrode.

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