Flow battery flow channel with bifurcated finger-type structure on bipolar plate

Abstract

The invention relates to the technical field of flow batteries, in particular to a flow battery flow channel with a bifurcated finger-type structure on a bipolar plate. Electrolyte is evenly distributed to the liquid inlet flow channels of all the subunits of the flow channel step by step from an inlet in a step-by-step two-way mode, and the electrolyte of the liquid outlet flow channels is collected to an outlet step by step in the step-by-step two-way mode. The liquid inlet branch flow channels and the liquid outlet branch flow channels are alternately arranged and distributed in an interdigital manner and are not communicated with one another, so that electrolyte is forced to enter the porous electrode from the liquid inlet branch flow channels and then flow into the liquid outlet branch flow channels to be discharged. According to the two-branch finger-type flow channel, the electrolyte is uniformly distributed in each branch flow channel, so that on one hand, the uniformity of active substance supply is ensured, on the other hand, the pressure drop and the pump work loss are reduced, the sealing performance of a system is ensured, the flow of the electrolyte can be further improved, the mass transfer loss is further reduced, and the service life of the system is prolonged. And the battery voltage efficiency and the system efficiency are improved. The invention is suitable for flow batteries with different sizes, and the larger the size of the battery is, the more obvious the effect is.

Description

technical field [0001] The invention relates to the technical field of liquid flow batteries, in particular to a flow channel of a liquid flow battery with a bifurcated finger structure on a bipolar plate. Background technique [0002] In recent years, with the gradual depletion of fossil energy and the gradual deterioration of the ecological environment, vigorously developing new energy technologies represented by wind energy and solar energy has become an inevitable choice for sustainable social development. However, the acquisition of wind energy and solar energy is unstable, and direct integration into the power grid will seriously affect the safe and stable operation of the power grid. Large-scale energy storage systems can effectively solve the problem of new energy power generation and reduce the impact on the power grid. [0003] Flow batteries have the characteristics of good scalability, high efficiency, high safety, and long life, and have good application prospe...

AI Technical Summary

Problems solved by technology

However, as the power of the battery increases, the area of ​​the active region also increases, which leads to a rapid increase in the number of branch channels.

For the traditional interdigitated flow channel, the liquid separation method that flows in from the side of the main channel and enters the branch channels in turn cannot evenly distribute the electrolyte to each branch channel

The uniformity of electrolyte distribution becomes worse, which will inevitably lead to a large concentration overpotential

At the same time, the electrolyte is not evenly distributed to each branch channel, which will cause too much electrolyte to concentrate in certain branch channels to complete convection, which will cause a rapid increase in pressure drop and pump consumption

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