Numerical simulation for non-uniform compression of porous electrodes in vanadium flow batteries
Electrode compression can cause the porous electrodes of all vanadium flow batteries to invade the flow channel,affecting battery performance.This article established a three-dimensional steady-state model for non-uniform compression of porous electrodes in a serpentine flow channel,and compared the differences in internal pressure drop,electrolyte flow rate,and overpotential distribution between non-uniform compression of porous electrodes and rectangular compression of porous electrodes.It was found that non-uniform compression of porous electrodes was highly consistent with the actual situation.The effects of different compression ratios on the internal voltage drop,electrolyte velocity,concentration distribution of reactants,electrolyte potential,overpotential,local current density and concentration overpotential of non-uniform compression porous electrode were analyzed.The results showed that with an increase in compression ratio,the increase in internal pressure drop and velocity of the non-uniformly compressed porous electrode was greater than that of the electrode rectangular compression.The overvoltage at the contact area between the electrode non-uniformly compressed invasion part and the flow channel was higher than that of the electrode rectangular compression.The uniformity of the concentration distribution of reactants in the porous electrode with non-uniform compression increased,the electrolyte potential and overvoltage decreased,and the local current density and concentration overvoltage in the cathode area increased.
vanadium flow batteryelectrolytenon-uniform compression model of porous electrodesnumerical simulation
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