Membrane module, flow battery unit and battery stack

Abstract

The invention discloses a membrane module which can be applied to a flow battery unit. The membrane module comprises two frame bodies, multiple supporting pieces and membranes, wherein each frame body comprises a border part and a hollow part defined by the border part, at least one through hole through which liquid flows is arranged on the border part, first sides of the two border parts are arranged oppositely, second sides of the two border parts which are opposite to the first sides are respectively provided with at least one liquid flow groove extending from the through hole to the hollow part; the supporting pieces penetrate through the hollow parts in the first direction and are connected to the border parts; and the membranes can be maintained in the hollow parts of the two frame bodies by the supporting pieces. The invention also provides a flow battery unit containing the membrane module and a battery stack. By adopting the membrane module, electrolyte flowing in the membranes can be more evenly allocated, the internal resistance of the flow battery unit can be reduced and the service life of the membranes can be improved.

Description

technical field [0001] The present invention relates to a liquid flow battery, in particular to a membrane assembly, a flow battery unit and a battery stack including the membrane assembly. Background technique [0002] At present, with the intensification of energy shortage and environmental degradation, as an energy storage device, flow batteries have been widely used due to their long life, high reliability, and low operation and maintenance costs. In particular, an all-vanadium redox flow battery has been developed, which does not cause cross-contamination of positive and negative electrolytes, and vanadium ions are more suitable for high-current fast charging and discharging. All-vanadium redox flow batteries generally include end plates, bipolar plates, separators, electrode materials, electrode frames, sealing materials, etc. [0003] Chinese patent application number CN200910157588.0 discloses an integrated device for flow batteries, including negative electrode flo...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problem of uneven distribution of electrolyte in the working area of ​​the battery in the prior art, the present invention provides a membrane module, a flow battery unit and a battery stack including the membrane module, and the membrane module can be used to Make the resistance drop of the electrolyte at each point in the battery working area more uniform, so that the electrolyte is distributed more evenly in the process of flowing in the battery working area, and finally reduce the polarization potential of the flow battery unit and improve the performance of the battery stack

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