Development of Safety Performance for FC Stack in the New Toyota FCEV
2022-01-0825
03/29/2022
- Event
- Content
- The new Toyota MIRAI hydrogen fuel cell electric vehicle (FCEV) was launched in December 2020. Achieving both low cost and high performance of FC stack are important issues in FCEV development. On the other hand, it is also necessary to secure vehicle safety. This article gives an overview of the safety requirements for onboard FC stack. Furthermore, simulation and evaluation methods for the following issues of the FC stack are described. ⅰ) Impact Force Resistance: The FC stack was designed so that there is no cell layers’ slippage due to impact. The constraint force of the cell layers was provided by the frictional force between the cells and an external constraint. A simulation of the behavior of the cell layers under impact force was developed. The impact force resistance was confirmed by an impact loading test. ⅱ) Hydrogen Safety: The FC stack was designed so that the permeated hydrogen is ventilated and the hydrogen concentration is kept below the standard. In addition, from the viewpoint of fail-safe design, the stack case was equipped with some relief plugs to help prevent hazardous damage even if hydrogen gas is ignited. A hydrogen combustion simulation was developed for the above design. In a hydrogen ignition test, it was confirmed that the pressure relief avoids hazardous case scattering.
- Citation
- Enomoto, K., Ida, A., Harada, T., and Takeuchi, H., "Development of Safety Performance for FC Stack in the New Toyota FCEV ," SAE Technical Paper 2022-01-0825, 2022, .