Enhanced sealing gasket for fuel cell

Abstract

The invention relates to an enhanced sealing gasket for a fuel cell. The enhanced sealing gasket is mainly used for sealing various fluids in the fuel cell, so that the various fluids in the fuel cellare strictly isolated and can strictly flow in each channel and flow field. By mainly improving the structure of the gasket, the sealing reliability is improved, and the capability for resisting thefailure of a sealing structure is enhanced; and by utilizing two paired enhanced sealing gaskets in the fuel cell, the sealing reliability is further improved. The enhanced sealing gasket mainly structurally comprises a sealing matrix and a plurality of sealing bosses, wherein the sealing bosses are arranged on the sealing matrix and are vertical to the axial direction of the cross section of thegasket.

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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