A high performance zinc-bromine double flow battery and operation method

By designing the difference in volume of positive and negative electrode electrolyte storage tanks and connecting pipelines in zinc-brominated dual-flow batteries, the problems of liquid level shift and bromine element migration during battery operation are solved, and the battery capacity maintenance and performance improvement are achieved.

CN118970129BActive Publication Date: 2025-01-14DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Application Number
CN202411434466.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-10-15
Publication Date
2025-01-14
Estimated Expiration
2044-10-15

AI Technical Summary

Technical Problem

During operation, zinc-brominated dual-flow battery has lost battery capacity due to the offset of the positive and negative electrode electrolyte level and the migration of bromine element, and the direction of water migration is difficult to control, affecting battery performance.

Method used

By designing the different volumes of positive and negative electrode electrolyte storage tanks, ensure that the volume of the positive electrode storage tank is greater than the volume of the negative electrode storage tank. The concentration difference is used to guide the migration of the electrolyte, prevent the transfer of bromine element to the negative electrode, maintain the battery capacity, and use connecting pipes and valves to ensure liquid level. balance.

Benefits of technology

Effectively maintain battery capacity, improve discharge voltage efficiency and stack performance, extend battery life, simplify operation and reduce costs.

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Abstract

The present invention relates to a high-performance zinc-bromine double-flow battery and an operation method, and belongs to the field of flow batteries. During the continuous operation of the zinc-bromine double-flow battery, the volume of the positive and negative electrolyte storage tanks is designed to be different, the concentration of active substances in the two-stage electrolyte is different, the concentration of the negative electrode active substance is always greater than the concentration of the positive electrode active substance, and the electrolyte undergoes a water migration process from the positive electrode to the negative electrode inside the battery stack. The liquid level of the negative electrode storage tank rises, causing the negative electrode electrolyte to flow to the positive electrode through a connecting pipe to ensure that the liquid levels of the positive and negative electrode electrolytes are the same. Keep the battery balanced. During this process, there is no loss of charged bromine element, so the positive electrode capacity of the battery is almost not attenuated. Because the volume of the positive electrode electrolyte is always greater than the volume of the negative electrode electrolyte. The bromine concentration in the positive electrode complex state is relatively low, the electrolyte phase separation is relatively not serious, the activity of the active substance in the positive electrode charge state is improved, and the battery stack performance is improved. This method significantly improves the battery stack performance.
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Citation Information

Patent Citations

  • All-vanadium redox flow battery

    CN103985892A

  • Flow battery negative electrolyte solution sealing system and flow battery system

    CN104900892A