Redox flow battery rebalance system, refox flow battery system and method for cycle capacity rebalance of redox flow battery

Abstract

The invention provides a redox flow battery rebalance system, a redox flow battery system containing the same and a method for cycle capacity rebalance of a redox flow battery. The above system or method is particularly and suitably used for a Fe-Cr flow battery. The redox flow battery rebalance system has a flow battery structure, wherein a positive electrolyte storage tank of the rebalance system is used for storing a positive electrode containing active positive ions, a negative electrolyte storage tank of the rebalance system is simultaneously taken as a positive electrode storage tank of a working flow battery and is used for storing a positive electrolyte of the working flow battery, and the redox flow battery rebalance system is only used for charging after being started. With the technical scheme provided by the invention, the redox flow battery rebalance system has the advantages of high rebalance efficiency and convenience, rapidness and high efficiency in operation.

Description

technical field [0001] The invention belongs to the field of electrochemical batteries, and in particular relates to a flow battery rebalancing system, a flow battery system including the flow battery rebalancing system, and a method for rebalancing the circulation capacity of the flow battery. Background technique [0002] Electrochemical flow battery (electrochemical flow cell), referred to as flow battery (flow redox cell or redox flow cell) is a new type of large-scale electrochemical energy storage device. Flow batteries are suitable for large-scale energy storage and are an energy conversion device that can store electrical energy in an electrolyte solution when charging, and convert the stored energy into electrical energy and release it when discharging. The output power of the battery depends on the size and quantity of the battery stack, while the storage capacity depends on the concentration and storage capacity of the electrolyte. During the charging and dischar...

AI Technical Summary

Problems solved by technology

In addition, in the early research of Fe-Cr flow battery system mainly conducted by NASA, Fe 3+ -H 2 Rebalance the battery, but the hydrogen electrode needs to use Pt or W catalyst. Pt penetrates into the negative electrode electrolyte through the ion membrane to cause hydrogen evolution reaction at the negative electrode. Inactivation will occur

It can be seen that these methods in the prior art will cause certain pollution to the electrolyte, leading to the occurrence of side reactions, and leading to a gradual decline in rebalance performance

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