Flow battery negative electrolyte solution sealing system and flow battery system

Abstract

The invention discloses a flow battery negative electrolyte solution sealing system and a flow battery system. The flow battery negative electrolyte solution sealing system comprises: an organic matter layer disposed on the negative electrolyte solution in a negative storage tank; a first pipeline connected to the negative electrolyte solution outlet of an electric pile and the negative storage tank, with one end of the first pipeline connected to the negative electrolyte solution outlet of the electric pile and the other end placed in the negative electrolyte solution; and a second pipeline connected to the negative storage tank and the negative electrolyte solution inlet of the electric pile. According to the invention, the organic matter layer is disposed on the negative electrolyte solution in the negative storage tank, and liquid state organic molecules have good fluidity and air tightness, thus ensuring good air isolation effect of the negative electrolyte solution to air, and the negative storage tank and a positive storage tank are connected by pipelines, thus ensuring the negative electrolyte solution in a safe liquid level state. Also compared with common flow battery systems, the capacity fading speed is reduced, and the flow battery system provided by the invention has good operation safety and stability.

Description

technical field [0001] The invention relates to the field of liquid flow batteries, in particular to a liquid flow battery negative electrode electrolyte sealing system and a liquid flow battery system. Background technique [0002] The increasing demand for traditional energy in the development of modern economy and society has made the problem of insufficient supply of traditional energy increasingly prominent, and people have to look for renewable energy such as wind energy and solar energy. In recent years, new energy represented by wind energy and solar energy has occupied a place in energy supply. With the increase of demand, the proportion of new energy is still increasing, but the defect of intermittent power generation caused by the influence of weather still exists. become a bottleneck hindering its development. Due to its huge energy storage advantages, flow batteries have received more and more attention, and there are continuous reports of MW-level demonstratio...

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Problems solved by technology

[0004] In recent years, scientific research institutes have carried out a lot of research on the sealing performance of negative electrode storage tanks. However, due to the material characteristics of the solution storage tanks, it has been impossible to achieve absolute sealing of the electrolyte storage tanks for many years. In 1994, European patent EP0729648B1 once proposed To the sealing method of laying a layer of mineral oil with a thickness of about 50-300mm on the surface of the negative electrode solution, the prospect of using grease to seal the electrolyte is expected

Tests have proved that due to the good fluidity and air tightness of liquid grease, the grease seal has achieved a good effect of isolating the air from the negative electrode solution, but the static test cannot characterize the charging and discharging operation of the battery system, and due to the characteristics of the grease itself- Insulation, adhesion and fluidity, in addition to the storage tank wall, during the circulation process of the flow battery system, grease should be strictly prevented from entering the battery stack, otherwise the grease will contact the carbon felt electrode and adhere to its surface, making the carbon felt Losing the conductive and catalytic functions will cause irreversible damage to the flow battery, such as a sharp drop in system capacity and efficiency

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