全钒液流电池多孔电极受压后性能变化的数值模拟

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中图分类号：TM911.4 文献标志码：A DOI：10.3969/j.issn.1003-9015.2025.02.015

Abstract：Porous electrodes of an al-vanadium flow batery are compressed during assembly processes，which makespart of the electrodes intrude into flowchannels and thusafects the battry performance.Considering the diffrence between thermo-physical properties ofporous electrodesand electrolyte，athre-dimensional non-isothermal thermalanalysis model of non-uniform compressed porous electrodes forallvanadium liquid flow batery was established.Efects of compresson ratios on theconcentration distributionof reactivesubstances，temperature distribution，reactive thermal characteristics，overpotential distributionandaverage powerofthecell inside the non-uniformly compressed porous electrode were analyzed.The results show that when the compression ratio increases，the distributionuniformityof the reactivesubstance concentrations inside thenon-uniformlycompressed porous electrode increases，the overall temperature inside the electrode rises，and there isan extreme temperature at the edge region.The ohmic heat，the heatof polarization，and the electrochemical heat atthe negative electrode decreases first and then increases，the average power of the battery decreases at itspeak，and theoverpotential rises at the positive electrode.

Key words：allvanadium liquid flow batery；non-uniform compression of porous electrodes；non-isothermal; numerical simulation

1前言

全钒液流电池（VRFB）具有安全性高、循环寿命长、功率和容量可独立调节等优点，在大规模电能储存领域具有广泛的应用前景[1-3]。（剩余11163字）