Abstract
The proton-exchange membrane fuel cell is a promising power source for automobile industry because of its zero pollution. However, its stack structure always faces increased contact resistance caused by assembly errors, leading to substantial energy loss during the working period. To enhance its output performance, the influence of assembly errors on contact resistance is studied for proton-exchange membrane fuel cell. The mechanical simulation model of fuel cell assembly process is established to provide contact resistance distribution with different assembly errors. An improved global sensitivity analysis method is proposed to evaluate the influence coefficient of each assembly error term on contact resistance based on a series of randomized simulation data. The case study of a single-layer fuel cell demonstrates the proposed method achieves higher efficiency than traditional sensitivity analysis methods, and finds out key assembly errors in regard to reducing contact resistance.
Highlights
The fuel cell is a promising power source for mobile transportation because of its advantages such as zero pollution, high efficiency, and portability.[1,2,3] In particular, proton-exchange membrane fuel cell (PEMFC) has been attracting extensive attentions in recent years because of its low temperature operation, high power and rapid start-up.[4,5,6] due to its own resistance, PEMFC has to bear serious energy loss during its working period
The study of influence degrees of assembly errors on contact resistance is of great significance for improving PEMFC performance
The influence degrees of assembly errors on contact resistance is analyzed for PEMFC, which informs assembly error control measure that can reduce contact resistance effectively and realize enough output power under given voltage
Summary
The fuel cell is a promising power source for mobile transportation because of its advantages such as zero pollution, high efficiency, and portability.[1,2,3] In particular, proton-exchange membrane fuel cell (PEMFC) has been attracting extensive attentions in recent years because of its low temperature operation, high power and rapid start-up.[4,5,6] due to its own resistance, PEMFC has to bear serious energy loss during its working period. This section establishes the quarter-stack simulation model of a single-layer PEMFC to provide contact resistance with different assembly errors. In PEMFC simulation model, specific assembly error distribution can realize the minimum contact resistance, which corresponds to the valley point of u = f(X) in the integration domain.[37] For integration domains near valley points, that is, subdomain C, the Sobol sequence needs to generate more random points to reduce estimation errors. MCA can evaluate the distribution of function values based on a series of randomized sample points located in the feasible domain of input parameters, without depending on analytic equations.[35] And, the simulation model can provide the oneto-one correspondence of contact consistence based on randomized assembly errors.
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