Sealing structure for fuel cell and process preparation method of sealing structure

Abstract

The invention discloses a sealing structure for a fuel cell and a process preparation method of the sealing structure. The sealing structure comprises a membrane electrode and a sealant, wherein the sealant is formed by spraying or injection molding or pasting a sealing material on the edge area of an anode plate, the edge area of a cathode plate or the edge area of the membrane electrode, and after spraying or injection molding or pasting of the sealing material is completed, the membrane electrode is placed between the anode plate and the cathode plate, and a sealing structure is formed through bonding, compressing and sealing. According to the sealing structure for the fuel cell and the process preparation method of the sealing structure, the sealing material is sealed on the anode plate, the cathode plate or the membrane electrode through a spraying or injection molding or pasting process, the thickness of the sealant can be accurately controlled through the spraying dosage, and the dosage of the sealing material is small; and compared with an existing sealing process, the process preparation method is simple, the equipment consumption is small, industrial automatic batch production is facilitated, and wide application and popularization are facilitated.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell sealing structure and a process preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell is a device that directly converts chemical energy into electrical energy. Because of its high power generation efficiency, zero emissions, and low noise, it is considered to be an ideal next-generation green and clean energy source. Proton exchange membrane fuel cells are mainly composed of end plates, collector plates, bipolar plates, sealing rings and membrane electrodes. Sealing materials and structural design are one of the important contents of fuel cells. Sealing materials have the function of isolating the external environment and preventing the leakage of reaction gas and cooling liquid. Although the sealing material does not participate in the electrochemical reaction of the battery, the quality of the sealing directly determines t...

AI Technical Summary

Problems solved by technology

Among them, the process of rubber thermoplastic molding is complicated, the precision of sealant thickness is difficult to control, and the sealing effect is poor; the thickness and position of the sealing layer formed by dispensing seal are difficult to control, the consistency is poor, and it is easy to cause problems such as increased internal resistance; plastic frame heat The pressure seal is easily squeezed and deformed in the assembled fuel cell stack, resulting in uneven stress distribution at the edge of the membrane electrode and leakage.

At the same time, the procedures of these three processes are complicated, the precision is difficult to control, and the manufacturing efficiency is low, which is not conducive to mass production.

[0004] In high-temperature proton exchange membrane fuel cells, the working temperature reaches 140 ° C ~ 180 ° C, sealing materials such as FKM (fluorine rubber), PFA, FEP, PTFE (polytetrafluoroethylene), tetrapropylene fluorine rubber, FFKM, silicone rubber, etc. are commonly used materials, but lack of mature sealing line assembly and stack integration process