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Development of a two-dimensional, moving mesh treatment for modelling the reaction chamber of the soluble lead flow battery as a function of state of charge for Pb and PbO2 deposition and dissolution
Journal of Energy Storage ( IF 9.4 ) Pub Date : 2020-06-24 , DOI: 10.1016/j.est.2020.101484
E.J. Fraser , K.K.J. Ranga Dinesh , R.G.A. Wills

During cycling of the soluble lead flow battery, solid layers of lead (Pb) and lead dioxide (PbO2) are deposited and stripped from the electrode surfaces. As such, there is a change in geometry of the flow field within the battery. A detailed two-dimensional numerical model which simulates this change in geometry using a moving mesh technique is developed. The model accounts for deposition of Pb, PbO2 along with the formation of lead oxide (PbO) during discharge of the PbO2 deposit due to a side reaction which is commonly assumed in the literature. Over short time scales of around 1 hr charge/discharge periods, which are typically reported in the literature, the effect of this is small. However, over more realistic time scales (>1 hr), by applying this technique, significant differences are seen in the cell resistance and in the mass flow rate of electrolyte. As a result, a difference in cell voltage of up to 65 mV is seen over a 24 h period. The numerical results are validated against experimental data, showing an agreement in the voltage-time profile and a close fit for the moving mesh approach.



中文翻译:

二维移动网格处理技术的发展,该模型用于对可溶铅流电池的反应室进行建模,以作为Pb和PbO 2沉积和溶解的电荷状态的函数

在可溶铅流电池循环期间,沉积了铅(Pb)和二氧化铅(PbO 2)的固体层并从电极表面剥离。因此,电池内流场的几何形状发生了变化。开发了一种详细的二维数值模型,该模型使用移动网格技术来模拟这种几何形状的变化。该模型考虑了铅,PBO的沉积2所述的PbO放电过程中与氧化铅(PbO)的形成沿2由于副反应而沉积,这是文献中通常假定的。在大约1小时的充电/放电周期的短时间范围内(这通常在文献中有所报道),其影响很小。但是,在更现实的时标(> 1 hr)上,通过应用此技术,可以看到电池电阻和电解质质量流率存在显着差异。结果,在24小时内观察到高达65 mV的电池电压差异。数值结果与实验数据进行了验证,表明电压-时间曲线具有一致性,并且非常适合于移动网格方法。

更新日期:2020-06-24
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