A flow battery stack and a method for uniformly distributing electrolyte in each battery to improve battery performance

Abstract

The invention discloses a redox flow battery electric stack and a method for uniformly distributing an electrolyte in each section of battery to improve battery performance. In the redox flow battery electric stack, the depth of an allocation runner of each section of battery is gradually increased from a public runner inlet, and / or the diameter of the public runner is gradually increased in an arithmetic progression manner from the public runner inlet. With the adoption of the redox flow battery electric stack, the electrolyte flow quantity flowing into each single battery is consistent, the linear speed of the electrolyte is 0.05-0.08m / s, the concentration of the electrolyte is 1.5-2mol / l, the inlet pressure of the electric stack is 0.5-1.5bar, and the running temperature of the electric stack is 30-40 DEG C. By the two methods, the electrolyte flow quantity flowing into each section of battery can be effectively maintained consistent, so that the range is reduced, the concentration range is reduced, the utilization ratio of the electrolyte is improved, and the battery efficiency is improved. By the scheme, the electrolyte is uniformly distributed on an electrode surface and flows rapidly, so that the energy efficiency of an all-vanadium redox flow battery is effectively improved, and the service lifetime of the battery is prolonged.

Description

technical field [0001] The invention relates to a liquid flow battery stack and a method for uniformly distributing electrolyte in each battery to improve battery performance. Background technique [0002] Energy progress is the direct driving force for the development of social productivity. With the rapid development of economy and society, traditional fossil energy has long been unable to meet the needs of human development, and has caused a large amount of carbon dioxide emissions, which has a huge impact on the environment. For a long time, various countries have started to study various new energy sources. Among them, the large-scale utilization of wind energy, solar energy and nuclear energy is the main one. The all-vanadium redox flow battery uses vanadium ion solutions of different valence states as the active materials of the positive and negative electrodes, which are stored in respective electrolyte storage tanks. When charging and discharging the battery, the ...

AI Technical Summary

Problems solved by technology

Due to the influence of the length of the common flow channel, the electrolyte flow rate and inlet pressure of each single cell are different, resulting in different flow rates of the electrolyte solution flowing into each single cell. cause extremely bad phenomenon

If the range is too large and the overpotential is too high, it will cause the performance of the battery to decline

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