Redox flow battery system

Abstract

The invention relates to a novel battery system which can reduce leakage current of a redox flow battery and improve the charge-discharge performance of the battery. Each of a positive pole liquid storage tank and a negative pole liquid storage tank is completely isolated into an upper part and a lower part by a partition plate respectively. Firstly, positive pole electrolyte flows from a positive pole pump, flows through the battery and flows back to the upper half part of the positive pole liquid storage tank, when liquid level achieves a liquid level induction device, a valve is opened automatically, the valve is closed automatically after completing discharge of the electrolyte, the circulation is performed in such a way, and a pressure balancing pipe is shown in the figure. In a similar way, the operation way on the side of a negative pole is as that of a positive pole. By adopting the method, a main loop of the electrolyte above 90% of time is in cut-off state, and the leakage current can be further reduced (when multiple storage tanks and multiple spaces are adopted, the leakage current of the main loop can be cut off by 100%). Simultaneously, by adopting the intermittent-like charge-discharge way, the impacts of differential concentration polarization can be reduced, and the SOC (state of charge) / SOD (state of discharge) state of the redox flow battery can be improved.

Description

technical field [0001] The invention relates to the field of chemical energy storage by electrochemical reaction, in particular to a large-scale energy storage system of a redox flow battery. Background technique [0002] With the rapid development of the national economy, the contradictions among energy, resources, and the environment have become increasingly prominent. The country proposes to develop renewable and clean energy based on solar and wind power generation, and build a sustainable economic growth model. However, solar energy and wind energy produce significant changes in power generation with day and night changes, and it is difficult to maintain a stable power output. It needs to cooperate with a certain scale of power storage devices to form a complete power supply system to ensure continuous and stable power supply. The redox flow battery system has the functions of electric energy storage and high-efficiency conversion, and the battery capacity can be increa...

AI Technical Summary

Problems solved by technology

However, the power generation of solar energy and wind energy varies significantly with the change of day and night, and it is difficult to maintain a stable power output. It needs to cooperate with a certain scale of power storage devices to form a complete power supply system to ensure continuous and stable power supply.

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