电池装配力对全钒液流电池性能的影响

Effect of Battery Assembly Force on Performance of All-Vanadium Flow Battery

目的研究全钒液流电池组装预应力对电池性能的影响.方法基于固体力学、流体力学和电化学原理,建立二维模型.模型耦合了固体力学的本构方程和流体控制方程、Nernst-Planck电流分布方程,分析组装预紧力对石墨毡内应力、变形、孔隙率和电流密度分布的影响.结果预紧力的增大加剧了石墨毡内应力、变形和孔隙率的不均一性,从而导致全钒液流电池内电流密度分布的不均衡性.结论随着装配预应力的增大,石墨毡内应力和变形分布不均匀性加剧;预应力越大,孔隙率分布不均匀性越剧烈;预应力越大,石墨毡内电流密度不均匀性越剧烈.

To study the influence of the prestressing of the vanadium redox flowbattery on the battery performance. Based on the principles of solid mechanics,fluid mechanics and electrochemistry,a two-dimensional model was established. The model coupled the constitutive equations of solid mechanics and fluid control equations,Nernst-Planck current distribution equation,and analyzed the influence of assembly preload on the distribution of stress,deformation,porosity and current density of graphite felt. The increase of pre-tightening force aggravated the inhomogeneity of stress,deformation and porosity in the graphite felt,which resulted in the uneven distribution of current density in the vanadium redox flowbattery.