Liquid flow frame device of all vanadium redox flow battery

Abstract

The invention discloses a liquid flow frame device of an all vanadium redox flow battery, which is characterized in that centrosymmetric liquid flow passages which have kinks and are derious for several times are arranged on the liquid flow frame; the sections of the liquid flow passages have shapes close to Z or the shape formed by connecting a plurality of Zs. In the device, the derious liquid flow passages have a plurality of kinks, thereby lengthening internal flow passages, increasing effective resistance of self-discharge in a battery, slowing self-discharge and avoiding local overtension in the battery, moreover, during standing of the battery, the electrolyte in the derious liquid flow passages is inevitably faced with breaks at the kinks of the liquid flow passages, so that the electrolyte in the single battery is isolated from the electrolyte in other single batteries and liquid storage devices, thereby avoiding the battery from self-discharge when being communicated by the electrolyte; after charging, plenty of electric energy is stored in electric piles, thus improving the energy transfer efficiency of the vanadium battery and prolonging the service life of the vanadium battery.

Description

technical field [0001] The invention relates to the field of vanadium batteries, in particular to a flow frame device of an all-vanadium ion redox flow battery. Background technique [0002] The all-vanadium redox flow battery is called vanadium battery for short. The vanadium battery uses vanadium ion solutions of different valence states as the positive and negative active materials respectively. The electrolyte is driven by an external pump to circulate the electrolyte in the storage tank and the battery stack. The negative electrode electrolyte undergoes reduction and oxidation reactions on the electrodes on both sides of the ion exchange membrane in the stack, thereby completing the charging and discharging process. [0003] Its reaction formula is as follows: [0004] Negative reaction: V 2+ -e - =V 3+ E. 0 =-0.26V [0005] Positive reaction: VO 2 + +2H + +e - =VO 2+ h 2 O E 0 = 1.00V [0006] The electrolyte solution is the carrier for the bat...

AI Technical Summary

Problems solved by technology

[0008] 1. The uneven distribution of liquid flow among the cells causes uneven voltage among the cells, making the voltage difference between different cells reach 0.1V-1V, thereby reducing the energy conversion efficiency of the battery;

[0009] 2. The leakage branch current formed by the electrolyte between the monomers is relatively large, which reduces the energy conversion efficiency of the battery;

[0010] 3. The local voltage distribution among the monomers is uneven, which accelerates the corrosion rate of bipolar electrodes;

[0011] 4. When the battery stops running, the electrolyte between the monomers is still in a state of collusion, and the leakage branch current causes serious self-discharge of the battery

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