Redox flow cell stack

Abstract

The invention provides a redox flow cell stack which comprises at least two redox flow frames (7) and flow collecting bodies (3) with the number corresponding to that of the redox flow frames. The redox flow cell stack is characterized in that the redox flow frames are provided with a liquid inlet hole (71) and a liquid outlet hole (72) which are respectively used for leading electrolyte onto the surface of the flow collecting bodies and out of the surface thereof. The design of the invention can avoid the phenomena of seepage and weeping since the liquid inlet hole and the liquid outlet hole of the flow collecting bodies (3) are scoured by the electrolyte in the flowing process; meanwhile, the liquid inlet hole, the liquid outlet hole and flow channels can be conveniently designed on the redox flow frames, so that the liquid flow inside a cell can be more balanced and smooth.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a battery stack structure of a vanadium battery. Background technique [0002] The battery stack of a flow battery (such as a vanadium redox flow battery) is usually composed of a certain number of single cells connected in series. Each single cell is composed of a current collector (single collector plate), a liquid flow frame, an electrode, a diaphragm, an electrode, a liquid flow frame, and a current collector (single collector plate). figure 1 It shows a diagram of the components of a battery stack composed of two single cells, starting from the liquid inlet according to the end plate 1, the gasket 2, the current collector (unipolar plate) 3, the electrode 4, the liquid flow frame 5, and the diaphragm 7 , electrode 4, bipolar plate (collector) 6, electrode 4, liquid flow frame 5, electrode 4, current collector (unipolar plate) 3, gasket 2, and end plate 1 are assembled into a batte...

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Problems solved by technology

[0003] Existing liquid flow batteries, such as those disclosed in Chinese applications 200710105754.3, 200810030801.7, 200510086917.9, and 200610011470.3, all have holes on the current collector for the electrolyte to enter and exit. When flowing in the stack, it is easy to cause corrosion of the inlet and outlet of the current collector. In addition, the current design of the stack structure does not solve the leakage of the stack well. During assembly, the assembly is complicated and cannot be positioned accurately, which is likely to cause gaps between components. The misalignment affects the battery assembly effect

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