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Experimental study on current distribution in parallel-connected solid oxide fuel cell strings
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DOI：10.1007/s11708-024-0941-9.png)
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Abstract
En 中文
To increase the power generated by solid oxide fuel cells (SOFCs), multiple cells have to be connected into a stack. Nonuniformity of cell performance is a worldwide concern in the practical application of stack, which is known to be unavoidable and caused by manufacturing and operating conditions. However, the effect of such nonuniformity on SOFCs that are connected in parallel has not been discussed in detail so far. This paper provides detailed experimental data on the current distribution within a stack with nonuniform cells in parallel connection, based on the basics of electricity and electrochemistry. Particular phenomena found in such a parallel system are the self-discharge effect in standby mode and the capacity-proportional-load sharing effect under normal operating conditions. It is believed that the experimental method and results proposed in this paper can be applied to other types of fuel cell or even other energy systems.
Keywords:
solid oxide fuel cells (SOFCs)
stack
nonuniformity
parallel connection
current distribution