A fuel cell stack seal forming process
By synchronously moving the UV curing light source and the dispensing assembly, the sealant is cured in two stages, which solves the problem of poor fusion caused by the high thixotropy of the sealant and improves the sealing effect and lifespan of the fuel cell stack sealant.
Patent Information
- Application Number
- CN202310157866.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-02-23
- Publication Date
- 2026-05-29
- Estimated Expiration
- 2043-02-23
AI Technical Summary
In the traditional fuel cell stack sealing component molding process, the high thixotropic properties of the sealant lead to poor joint fusion, affecting the sealing effect and lifespan, and failing to meet the requirements of high power density and cost.
The sealant is cured in two stages using a method that synchronizes the movement of the UV curing light source and the dispensing assembly. This ensures that the sealant maintains its good shape before curing. The UV adhesive used has a viscosity of 70,000-100,000 mPa·s, a thixotropic index of 2-4, a wavelength of 365-405 nm, a radiation intensity of ≥500 mw/cm2, and curing times of 3-5 s and 20-30 s, respectively.
It improves the dispensing accuracy and sealing effect of the sealant, enhances the adhesion strength between the adhesive and the electrode plate, and improves the lifespan of the sealant.